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Enterprise AI
Office & Documents
AI Document AnalysisExtract document highlights, actions and open questions.AI PDF SummarySummarize text PDFs with page references.AI Excel AnalysisCompute local statistics before optional AI interpretation.AI Excel Formula AssistantGenerate and explain formulas for the specified layout.AI Meeting MinutesTurn meeting transcripts into decisions and actions.AI Work ReportDraft reports from actual work records.
Network & Architecture
AI Network PlanDraft a network plan from sites, users and workloads.AI Network TopologyGenerate an exportable logical topology.AI VLAN PlannerPlan VLANs, subnets and access boundaries.IP / Subnet PlannerAllocate IPv4 subnets locally by host requirements.AI ACL AssistantDraft reviewable access rules from requirements.AI Wi-Fi Planning AssistantEstimate wireless needs from space and concurrency.
IT Operations
AI IT TroubleshooterBuild a troubleshooting sequence from symptoms.AI Log AnalysisAnalyze sanitized logs and event timelines.Windows TroubleshooterExplain Windows errors with read-only checks first.Linux Command AssistantExplain Linux commands and modification risks.Virtualization TroubleshooterInvestigate VM, storage and virtual network issues.NAS & Storage TroubleshooterProtect data before investigating storage faults.
Servers & Infrastructure
AI Server Sizing AssistantDraft sizing ranges from workloads and growth.GPU Memory EstimatorEstimate weights, KV cache and memory headroom.LLM Deployment Cost CalculatorCompare API and self-hosting using your own prices.AI Virtualization PlanPlan resource pools, storage, migration and rollback.AI Backup PlanPlan backup retention, capacity and restore checks.AI Disaster Recovery PlanDraft a recovery design around RTO and RPO.
Knowledge & Automation
Enterprise Knowledge DemoAsk questions about this session's documents.Internal Q&A DemoExplore source-grounded internal policy questions.Product Knowledge DemoAnswer product questions from supplied manuals.After-sales Knowledge DemoFind support guidance in manuals and service notes.Document Search DemoSearch this session's documents locally.AI Agent Workflow PlannerPlan agent inputs, tools, approvals and failures.
Management & Security
Enterprise IT Self-assessmentCreate a self-assessment with transparent criteria.Network Security Self-checkReview key controls and unknowns.AI Contract Reading AssistantExtract payment terms, obligations and review items.AI Tender AnalysisExtract eligibility, scoring, deadlines and requirements.AI Bid Draft AssistantDraft a response outline and missing-evidence list.AI SOP & Policy DraftDraft roles, steps, checks and exception handling.
Professional Tools
PoE Power 7
PoE Switch Power Budget CalculatorTotal endpoint power demand and compare it with a switch PoE budget after cable and safety margins.PoE Class Compatibility CheckerCheck IEEE PoE Type/Class compatibility and actual PD power, then recommend the minimum PSE standard.PoE Cable Loss & Delivered Power CalculatorEstimate PoE voltage drop, cable loss, and delivered endpoint power from voltage, load, length, and equivalent loop resistance.Switch Power & Annual Energy Cost EstimatorConvert switch base load and PoE output into input power, annual energy use, and electricity cost.Switch Uplink & Oversubscription PlannerEstimate access demand, oversubscription, and headroom from port count, access rate, utilization, and uplinks.PoE Camera Switch SizingSize PoE switches for cameras from ports and power budget.PoE AP Switch SizingSize PoE switches for wireless APs from ports and power budget.
Wireless & Wi-Fi 9
RSSI / SNR Wireless Link Quality AssessmentCalculate SNR from RSSI and noise floor and provide a practical Wi-Fi link quality rating.Free-Space Path Loss CalculatorCalculate free-space path loss for a frequency and distance under ideal line-of-sight conditions.Enterprise Wi-Fi AP Count EstimatorEstimate AP count from both coverage area and concurrent client capacity, then apply a design reserve.Wi-Fi Application Bandwidth PlannerEstimate required wireless capacity from users, concurrency, per-user demand, airtime efficiency, and reserve.RF Link Budget & Fresnel Zone AssistantCalculate free-space loss, received level, fade margin, midpoint first Fresnel radius, and clearance target.EIRP & Antenna Gain Compliance CalculatorCalculate EIRP from transmitter power, feed loss, and antenna gain, then compare it with a user-supplied local limit.dBm / mW / W Power ConverterConvert power bidirectionally between logarithmic dBm, milliwatts, and watts.High-density Wi-Fi Capacity & AP CountSize high-density Wi-Fi APs from throughput and concurrent-client constraints.Wi-Fi PHY & Effective ThroughputConvert PHY rate into aggregate and per-client throughput.
Fiber Links 7
Fiber Link Loss Budget CalculatorTotal fiber, connector, splice, and engineering losses and compare them with transceiver optical budget.Fiber Connector & Splice Loss CalculatorTotal passive optical losses from connectors, adapters, mechanical splices, and fusion splices.Optical Power Margin & Alarm EvaluatorCompare measured receive power with module sensitivity and overload limits, then calculate path loss and operating margins.PON Splitter & OLT/ONU Optical BudgetCheck a PON path from OLT output, ONU sensitivity, fiber, splitter, connector, splice, and engineering losses.BIDI Wavelength Pairing & Link CheckerCheck whether local and remote BIDI transceiver TX/RX wavelengths form a valid pair.CWDM/DWDM Wavelength & Channel PlannerGenerate a continuous wavelength and frequency plan from a selected DWDM frequency grid or CWDM wavelength spacing.Fiber Color Code & Core Sequence ReferenceGenerate fiber numbers, group numbers, and colors using the common 12-color base sequence.
Structured Cabling 7
Cable Box Count & Allowance CalculatorCalculate total cable length and full box count from outlet count, average run, box length, waste, and reserve.Structured Cabling BOM CalculatorEstimate patch panels, jacks, faceplates, patch cords, cable managers, and rack units from outlet demand.Structured Cabling Material & Cable Quantity AssistantEstimate horizontal cable, patch-cord lengths, design outlets, and labels from project quantities and editable allowances.Rack Unit & Equipment Layout PlannerTotal equipment, patching, cable management, power, ventilation, and growth space, then suggest a common rack size.Patch Cord & Cable Manager PlannerEstimate active ports, patch cords, patch panels, and cable managers from editable project rules.Cable Weight & Tray Load EstimatorEstimate installed cable weight and tray design load from cable quantity, length, manufacturer weight, reserve, and safety factor.MDF/IDF Floor & Point PlannerEstimate MDF, IDF, planned points, and access switches by floor.
Video Surveillance 5
CCTV Storage & Retention CalculatorEstimate usable and recommended raw CCTV storage from camera count, bitrate, recording schedule, retention, and overhead.CCTV Bandwidth & NVR Throughput PlannerSeparate recording ingress, live-view egress, playback egress, and recommended NVR interface capacity.Camera Focal Length, FOV & Coverage CalculatorCalculate field of view and theoretical scene dimensions from sensor size, focal length, and distance.DORI/PPM Pixel Density & Identification DistanceCheck horizontal pixel density against the current IEC 62676-4:2025 visual-performance gate.Camera Height, Tilt & Blind-zone AssistantCalculate near and far floor intersections and coverage depth from height, tilt, and vertical FOV.
Storage & RAID 8
RAID Usable Capacity CalculatorEstimate usable array capacity from disk count, disk size, RAID level, hot spares, and filesystem reserve.RAID Rebuild Time EstimatorEstimate RAID rebuild duration from rebuild size, observed throughput, workload contention, and controller efficiency.TB/TiB & Vendor Capacity Reality CheckConvert vendor decimal TB to binary TiB and apply an editable filesystem allowance.SSD Endurance TBW/DWPD Life CalculatorConvert capacity, DWPD, and warranty into TBW, then estimate life from host writes and write amplification.IOPS, Throughput & Queue Depth ConverterConvert IOPS and block size to throughput and estimate queue depth from latency.Storage Growth & Expansion ForecastForecast ending use and threshold timing from compound and fixed monthly growth.Dedupe & Compression Capacity EstimatorEstimate physical storage after deduplication, compression, and metadata overhead.Ceph k+m Erasure-code CapacityEstimate Ceph erasure-coded usable capacity from OSDs, k+m, and reserve.
Data Center 11
Rack Power & Heat Load CalculatorTotal rack IT load, apply growth allowance, and convert it to electrical and cooling requirements.UPS Capacity & Load Ratio SizerCalculate required UPS kW/kVA and check a selected unit.UPS Runtime Range EstimatorEstimate a UPS runtime range from battery, load, efficiency, and health inputs instead of presenting Wh/W as exact runtime.Single/Three-phase kW, kVA & Current CalculatorCalculate apparent power and current from phase mode, power, voltage, power factor, and efficiency.Data Room Cooling & Precision AC EstimatorTotal room heat sources, add design reserve, and calculate duty and N+1 cooling units.Data Center IT Load & Facility Power SizerTotal IT power, add growth, and calculate facility power from design PUE.PUE/DCiE & Measurement Boundary AssistantCalculate PUE, DCiE, and non-IT energy while distinguishing an instant estimate from a formal metered boundary.Data Center Annual Energy Cost & Efficiency ScenarioCompare annual energy and cost from IT load, current and target PUE, schedule, and electricity price.UPS Battery Series/Parallel Bank PlannerSize UPS battery series and parallel strings from bus voltage and runtime energy.Modular UPS Redundancy & Module CountSize modular UPS active and redundant modules from usable module capacity.A/B Feed Load Balance PlannerCalculate normal A/B feed split and automatically check N-1 capacity after either feed fails.
Servers & Virtualization 9
Virtualization CPU/vCPU Oversubscription PlannerCalculate usable physical cores, vCPU demand, and oversubscription after HA and host reserves.Virtualization Memory Reservation & HA Capacity PlannerCalculate HA memory capacity after failed-host and system reserves, platform overhead, and growth.LLM Weights & Inference VRAM EstimatorEstimate inference VRAM from weights, KV cache, and runtime overhead and compare it with aggregate GPU VRAM.Kubernetes Node & Pod Capacity PlannerEstimate allocatable cluster resources and pod capacity after system and DaemonSet reserves.Container Requests & Limits Right-sizing AssistantDerive CPU and memory requests and limits from P95 and peak telemetry with editable buffers.Server Power, PDU & Rack Placement PlannerCalculate normal and failover current, recommended feed capacity, and rack count by rack units.GPU Server Power & Electrical EstimatorEstimate input power, design power, and heat from GPU TDP, other components, PSU efficiency, and reserve.KV Cache Context Memory EstimatorEstimate inference KV cache from layers, KV heads, head dimension, context, batch, and data type.Server Cluster BOM & N+1 Node PlannerCalculate CPU- and memory-driven node counts with growth, utilization, and failed-node reserve.
Backup & Recovery 8
Backup Window & Bandwidth CalculatorEstimate sustained backup bandwidth from dataset size, daily change rate, reduction ratio, backup window, and protocol efficiency.Full/Incremental Backup Capacity & Retention PlannerEstimate repository capacity from protected data, full copies, daily change, incremental days, reduction, and overhead.GFS Retention & Media Count PlannerTotal daily, weekly, monthly, and yearly generations and estimate media count.3-2-1-1-0 Backup Strategy CheckerCheck copies, media, offsite, immutable/offline, and zero-error recovery verification controls.RPO/RTO & Recovery Scenario CalculatorEstimate maximum data loss at target RPO and the RTO gap from restore throughput and dependency recovery.Replication Bandwidth & Backlog Catch-up CalculatorCompare continuous change demand with effective link bandwidth and estimate backlog catch-up time.Snapshot Capacity & Merge Risk EstimatorEstimate snapshot capacity and merge time after subtracting active write throughput.Immutable Backup Capacity & Lock-period PlannerEstimate immutable repository capacity from protected data, change, lock days, full copies, reduction, and overhead.
Electrical Engineering 10
DC, Single & Three-phase Power Current CalculatorConvert power to input current and apparent power for DC, single-phase, or balanced three-phase systems.DC, Single & Three-phase Voltage Drop CalculatorCalculate line voltage drop from user-entered resistance, reactance, length, current, and power factor.Cable Size & Ampacity Pre-selectorApply entered temperature, grouping, and installation factors to candidate ampacity and check the project voltage-drop limit.Breaker, Fuse & RCD Pre-selection CheckerCheck entered design current, protection rating, cable ampacity, fault current, breaking capacity, and RCD threshold.Low-voltage Central Power Supply SizerSize central low-voltage power current, power, and module count from device load, startup, and reserve.Battery Ah/Wh & Load Runtime CalculatorEstimate usable energy and runtime from voltage, Ah, efficiency, depth of discharge, health, and rate derating.Battery Series, Parallel & Consistency CheckerCalculate battery-bank voltage, capacity, and energy and report consistency from user-measured inputs.12V/24V Device Voltage Drop & PSU ZoningEstimate devices per power zone from both minimum remote voltage and PSU-current constraints.Grounding Conductor & Copper Bar Pre-sizingCalculate required area from entered current density and short-time thermal inputs and compare with a selected bar.Lightning Protection Zone Geometry EstimatorPerform a simplified 2D geometry estimate using an entered protection angle or rolling-sphere radius.
LED & AV 10
LED Wall Size, Resolution & Pixel CountCalculate wall size, resolution, pixel count, and pitch from whole-module geometry.LED Pixel Pitch & Viewing Distance AssistantCalculate detail and comfort viewing distances from pixel pitch and a user-entered pixel visual angle.LED Wall Power Distribution & PSU PlannerSize LED PSUs and circuits from module average/peak power, load limits, and design reserve.LED Module, Receiving Card & Processor Load PlannerEstimate modules, receiving cards, data ports, and processors from user-entered pixel capacities.LCD Video Wall Size & Layout PlannerCalculate LCD wall envelope dimensions from panel size, combined bezel, rows, columns, and service clearance.Projector Throw Distance, Screen Size & Lens RatioCalculate throw-distance range and image diagonal from lens ratio, width, aspect ratio, and tolerance.Projector Brightness, Ambient Light & Screen GainEstimate screen illuminance and simplified ambient contrast from lumens, area, gain, utilization, and ambient light.Conference Display Size & Viewing DistanceCalculate minimum display dimensions from the farthest viewer and an entered image-height viewing angle.HDMI, SDI & HDBaseT Distance/Bandwidth AssistantEstimate uncompressed data rate and check entered link capacity and certified distance.AV Matrix Size & Port Planning AssistantCalculate recommended matrix input and output capacity from endpoints, growth reserve, and redundancy.
Professional Audio 8
Amplifier Power & Headroom CalculatorSize amplifier power from loudspeaker sensitivity, distance, target SPL, and peak headroom.70V/100V Distributed Audio Power & Zone PlannerTotal distributed-speaker taps and size amplifier capacity with line loss and reserve.Speaker Impedance Series/Parallel CalculatorCalculate equivalent impedance, speaker count, and total power for identical series-parallel speakers.SPL Distance Loss & Speaker SummationEstimate listening-position SPL from reference level, distance, speaker count, and summation efficiency.Public Address Cable Line Loss CalculatorCalculate constant-voltage PA line loss from voltage, load, length, and entered conductor resistance.Meeting Room Speaker Coverage & Spacing EstimatorEstimate ceiling-speaker spacing and count from room geometry, coverage angle, and overlap.RT60 Reverberation & Absorption EstimatorEstimate RT60 and additional absorption with the Sabine equation.Meeting Room Audio Channel & BOM PlannerBuild a room-level microphone, speaker, amplifier, DSP, and controller count summary.
Access & Building 8
Access Control Door Controller & Reader BOMBuild an access-control core BOM from doors, readers, controller capacity, and reserve.Access Control PSU, Lock & Battery PlannerSize access-control PSU current, design power, and backup battery from connected loads.Pedestrian Gate Throughput & Queue EstimatorEstimate pedestrian gate capacity and required lanes from peak flow and service time.Parking Entry & Barrier Throughput PlannerEstimate parking-lane capacity from peak vehicle flow, service time, and exceptions.RS-485 Bus Length, Device Count & Termination CheckerCheck an RS-485 segment against entered product limits, topology, and termination.Modbus Address & Register Map PlannerGenerate a deterministic Modbus device-address and register map.BACnet Point, Instance & Network PlannerPlan BACnet devices, points, device instances, and network count.ELV Point Schedule & Multi-system BOM WorkbenchSummarize ELV points and derive core switch and controller quantities.
ELV Construction 8
Cable Tray Support & Hanger Quantity EstimatorEstimate tray supports and hanger rods from route length, spacing, fittings, and reserve.Conduit, Clamp & Bend Quantity EstimatorEstimate conduit, clamps, and bends from route geometry and waste allowance.Steel & Copper Section Weight CalculatorCalculate material weight from entered section area, length, quantity, and density.Firestop Material Quantity EstimatorEstimate firestop volume and mass from opening geometry, cable fill, density, and waste.Equipment Plinth & Rack Base Material EstimatorEstimate base-frame profile length and weight from rack dimensions and entered unit weight.CCTV Pole Foundation Concrete Pre-estimatorEstimate CCTV pole foundation concrete from entered geometry, displacement, and waste.Outdoor Enclosure Size, Thermal & Power AssistantEstimate minimum enclosure dimensions and active cooling shortfall.ELV BOM Allowance & Pre-quotation CheckerCheck material allowance, labor, freight, contingency, tax, and total before quotation.
PDF Tools
Organize pages
Convert PDF
Extract content
Page numbers & watermark
Choose a task above, add files, then inspect and export. Local PDF operations do not upload your files. Webpage to PDF uses a restricted server service. Office conversion, OCR, compression, signing and AI PDF are not offered by this version.
PDF ToolboxProcess PDFs locally in the browser: merge, split, delete, reorder and rotate pages, convert images to PDF, and export pages as JPG/PNG.Webpage to PDFCreate a controlled reading PDF from a public webpage with A4/Letter and portrait/landscape options while blocking private networks and metadata.
Files & Media
Video URL parserUse Video URL parser for a browser-based web or network helper without logging pasted content by default. Currently supports only public Bilibili BV video links; login-only content, playlists, DRM and other platforms are not supported.File ConverterConvert supported image (including HEIC/HEIF), audio and video formats. Available targets depend on the file, browser and codecs. PDF, Office documents and archives are not supported.Web File TransferConnect a phone and computer with a room code and transfer files peer to peer over WebRTC DataChannel; Yuqi exchanges signaling only.
Images & Design
Image OCRUse Image OCR for a barcode, ISBN or local image task; files stay in this browser by default. Uses Tesseract.js 7.0.0 (Apache-2.0). The selected language pack is downloaded from this site on first use; image recognition runs in the browser.QR code generatorUse QR code generator for a barcode, ISBN or local image task; files stay in this browser by default. Generate SVG QR codes with a locally bundled MIT-licensed library; input is not uploaded.QR code readerUse QR code reader for a barcode, ISBN or local image task; files stay in this browser by default. Read local QR codes with the browser BarcodeDetector; an unsupported browser is clearly identified.Barcode generatorUse Barcode generator for a barcode, ISBN or local image task; files stay in this browser by default. Generate Code 39 barcodes locally.ISBN barcodeUse ISBN barcode for a barcode, ISBN or local image task; files stay in this browser by default. Validate an ISBN locally and generate EAN-13.Image compressorUse Image compressor for a barcode, ISBN or local image task; files stay in this browser by default. Compress and download images locally with browser Canvas.Color converterUse Color converter to inspect, format or transform developer content locally in the browser. Convert between HEX, RGB and HSL.Background RemoverCreate a transparent PNG with local subject segmentation for portraits, products and common objects; review complex edges manually.AI Image UpscalerUpscale images locally by 2× or 4× with a same-origin ONNX model when practical, and use an honest high-quality fallback on constrained devices.Image ResizerResize by pixels or percentage, preserve aspect ratio by default, and review actual output dimensions.Image CropperCrop by coordinates and dimensions or drag a selection. The source file is never overwritten.Image Color PickerClick image pixels to inspect and copy HEX, RGB and alpha values from the browser-decoded image.Image Metadata CleanerRe-encode as PNG without the original EXIF, GPS or metadata. Color profiles, file size and animation may change.Favicon GeneratorCreate padded PNG icons at 16, 32, 48, 180, 192 and 512 pixels plus an ICO archive.Image Collage MakerArrange up to 12 images in a PNG grid with selectable columns and aspect-preserving cells.Image Quick EditorAdd watermarks, local mosaic/blur, rotation and padding in the browser without duplicating the existing crop and resize tools.
Time & Calendars
Working-day calculatorUse Working-day calculator for dates, timestamps or time zones without sending the input to Yuqi. Apply weekend rules and custom holidays.Date calculatorUse Date calculator for dates, timestamps or time zones without sending the input to Yuqi. Add or subtract dates and calculate intervals.Lunar-Gregorian converterUse Lunar-Gregorian converter for dates, timestamps or time zones without sending the input to Yuqi. Convert dates locally with Lunar-Javascript 1.7.7 (MIT); input is not uploaded.World time converterUse World time converter for dates, timestamps or time zones without sending the input to Yuqi. Use the browser Intl time-zone capability.English date formatUse English date format for dates, timestamps or time zones without sending the input to Yuqi. Convert date formats locally.Timestamp converterUse Timestamp converter for dates, timestamps or time zones without sending the input to Yuqi. Convert between seconds and milliseconds timestamps.Batch timestamp converterUse Batch timestamp converter for dates, timestamps or time zones without sending the input to Yuqi. Process multiple timestamp lines in one batch.Chinese almanacUse Chinese almanac for dates, timestamps or time zones without sending the input to Yuqi. Generate traditional lunar-calendar reference data locally with Lunar-Javascript 1.7.7 (MIT), including stems and branches, auspicious activities and clashes.Solar termsUse Solar terms for dates, timestamps or time zones without sending the input to Yuqi. Generate annual solar-term dates locally with Lunar-Javascript 1.7.7 (MIT).2026 holiday calendarUse 2026 holiday calendar for dates, timestamps or time zones without sending the input to Yuqi. This version covers 2026 only; official sources and update dates must be shown.Expiration date calculatorUse Expiration date calculator for dates, timestamps or time zones without sending the input to Yuqi. Add or subtract dates and show the expiration date.StopwatchUse Stopwatch for dates, timestamps or time zones without sending the input to Yuqi. Keep time locally in the browser.Random date and timeUse Random date and time for dates, timestamps or time zones without sending the input to Yuqi. Generate a random date or time within the user-selected range.Week and date converterUse Week and date converter for dates, timestamps or time zones without sending the input to Yuqi. Convert between ISO week numbers and dates.Age CalculatorCalculate calendar years, months, days and total days. Month-end dates clamp to the target month; February 29 anniversaries use February 28 in non-leap years.Countdown TimerSet a duration, pause, resume and reset. Sleep or closed browsers may prevent alarms; do not use for safety-critical timing.Pomodoro TimerSet focus and break durations. Start the next phase explicitly after completion. Background or sleeping pages may miss audio alerts.Duration SumSum working, video or study durations without wrapping after 24 hours.Shift CalendarCreate an exportable schedule for up to 366 days from a repeating shift cycle.
Currencies & Finance
Chinese amount in wordsUse Chinese amount in words to check an amount, rate or repayment parameter; results are estimates where noted. Convert an amount into uppercase Chinese financial numerals locally.Chinese cheque dateUse Chinese cheque date to check an amount, rate or repayment parameter; results are estimates where noted. Convert a Chinese date to formal uppercase notation locally.English amount in wordsUse English amount in words to check an amount, rate or repayment parameter; results are estimates where noted. Spell out an amount in English locally.Tax and rate calculatorUse Tax and rate calculator to check an amount, rate or repayment parameter; results are estimates where noted. Calculate four amount relationships with a tax-free threshold parameter.Currency exchangeUse Currency exchange to check an amount, rate or repayment parameter; results are estimates where noted. Uses the free public Frankfurter API and ECB reference rates. On request, the query passes through this site; amount calculations stay in the browser.World currenciesUse World currencies to check an amount, rate or repayment parameter; results are estimates where noted. Use a local currency reference table.Number sumUse Number sum to check an amount, rate or repayment parameter; results are estimates where noted. Add values locally in the browser.Contract payment calculatorUse Contract payment calculator to check an amount, rate or repayment parameter; results are estimates where noted. Split contract payments by percentage.Loan calculatorUse Loan calculator to check an amount, rate or repayment parameter; results are estimates where noted. Estimate equal-payment and equal-principal loan schedules.Bank routing lookupUse Bank routing lookup to check an amount, rate or repayment parameter; results are estimates where noted. Uses the public cnaps 0.0.34 reference snapshot (MIT), compiled by the community rather than verified live by banks. Confirm details with the bank before a transfer.Discount CalculatorCalculate savings and final price from a percentage reduction. A 20% discount means paying 80%; tax and fees are excluded.Compound Interest CalculatorProject whole-year balances using a nominal annual rate, compounding frequency and end-of-period deposits. Taxes, fees and inflation are excluded; returns are not guaranteed.Subscription BudgetCompare monthly, quarterly, annual and weekly subscriptions by annual and monthly equivalent cost.
Work & Benefits
Individual income taxUse Individual income tax to check an amount, rate or repayment parameter; results are estimates where noted. Estimate individual income tax from versioned parameters and display the assumptions.Labor income taxUse Labor income tax to check an amount, rate or repayment parameter; results are estimates where noted. Estimate remuneration tax with local parameters.Retirement age calculatorUse Retirement age calculator for dates, timestamps or time zones without sending the input to Yuqi. Provide a reference statutory retirement age by birth month under the 13 September 2024 NPC Standing Committee decision and State Council rules; not a substitute for an official determination.Work Hours & OvertimeTotal shifts and breaks, including explicit overnight shifts, and estimate PRC standard-hours overtime.Annual Leave & Unused Leave PayEstimate annual leave and distinguish normal wages from additional unused-leave pay.Severance Scenario CalculatorCompare specified PRC severance scenarios without deciding whether a dismissal is lawful.Social Insurance & Housing FundEnter verified effective bases and employee/employer rates and total the contributions.Annual Bonus Tax ComparisonCompare separate and combined annual bonus taxation, including unused annual deductions.Pension Scenario CalculatorModel pension components using entered salary basis, contribution index, service and account balance.
Housing & Renovation
Mortgage Prepayment ComparisonCompare lower-payment and shorter-term options from your current outstanding balance.Combined Housing LoanCalculate two loans separately and combine monthly payments and interest.Rent vs Buy ComparisonCompare discounted rental and ownership costs over an entered holding period.Shared Rent & UtilitiesSplit rent by room-weight days and utilities by person-days, conserving cents.Renovation Material CalculatorEstimate tile count, flooring area, paint volume or wallpaper rolls.Home Purchase BudgetSeparate down payment, entered taxes, fees, renovation and reserves.
Home & Travel
Phone location lookupUse Phone location lookup for a small everyday reference or calculation; coverage follows the page note. Uses local number-prefix data from query-mobile-phone-area 1.0.6 (MIT). Only the first seven digits are checked; number portability and new ranges may make results inaccurate. Full numbers are not stored.Common phone numbersUse Common phone numbers for a small everyday reference or calculation; coverage follows the page note. Use a local public telephone reference table.Area code and postcodeUse Area code and postcode for a small everyday reference or calculation; coverage follows the page note. Area codes use @province-city-china/district-code 8.5.8; postal codes use @tombcato/china-zipcode-data 1.0.2 as community-compiled reference data.ID location lookupUse ID location lookup for a small everyday reference or calculation; coverage follows the page note. Look up only the first six digits of a Chinese ID administrative code using local @vant/area-data 2.2.0 (MIT); a full ID number is not accepted.Chinese university lookupUse Chinese university lookup for a small everyday reference or calculation; coverage follows the page note. Snapshot of the official Ministry of Education university list as of 17 June 2026, covering 2,952 regular higher-education institutions; update when the official list changes.Country and region codesUse Country and region codes for a small everyday reference or calculation; coverage follows the page note. Use a local reference table of public standard country codes.World capitalsUse World capitals for a small everyday reference or calculation; coverage follows the page note. Use a local public geography reference table.Country calling codes and timeUse Country calling codes and time for a small everyday reference or calculation; coverage follows the page note. Use reference tables for country codes and time zones.US state abbreviationsUse US state abbreviations for a small everyday reference or calculation; coverage follows the page note. Use a local public table of US state abbreviations.Oil price lookupUse Oil price lookup for a small everyday reference or calculation; coverage follows the page note. Query a free public fuel-price API for 31 provincial regions and grades 0/89/92/95/98. The provider date is shown; prices are public references only.Chinese Kinship CalculatorLook up common Chinese close-family terms and retain age ambiguity.Shared Expense SettlementRecord multiple payers and participant subsets, then generate settlement transfers.Grocery Unit Price ComparisonNormalize package sizes and same-unit gifts to compare actual unit prices.Recipe Portion ScalerScale ingredient amounts for a different serving count, including fractions.Fuel Consumption & Trip CostMeasure fuel consumption or estimate fuel cost for a trip.EV vs Petrol Ownership CostCompare energy, annual expenses, purchase, resale assumptions and charging installation.Parking Fee CalculatorEstimate parking charges from an entered free period, unit price and rolling 24-hour cap.Family Trip BudgetTotal transport, lodging, food and activities, add contingency and divide per person.Waste Sorting — ShanghaiLook up common Shanghai household waste categories; unknown items remain unknown.
Health & Family
Blood type inheritanceUse Blood type inheritance for a small everyday reference or calculation; coverage follows the page note. Show possible blood-type combinations by ABO and Rh group.BMI calculatorUse BMI calculator for a small everyday reference or calculation; coverage follows the page note. Calculate BMI locally and show health guidance.WHO weight-for-age percentileUse WHO weight-for-age percentile for a small everyday reference or calculation; coverage follows the page note. Uses fixed in-project WHO Child Growth Standards LMS parameters for weight-for-age from birth to five years.Due Date & Gestational AgeEstimate due date and gestational age using last period and regular cycle length.Sleep Schedule PlannerPlan bedtime or wake time from your own sleep duration and latency.Daily Energy ExpenditureEstimate adult resting energy and apply an explicitly entered activity multiplier.
Text & Languages
English case converterUse English case converter to clean, transform or inspect text before it is reused. Change letter case in the browser.Text workflowUse Text workflow to clean, transform or inspect text before it is reused. Combine multiple text-processing steps in the browser.Text deduplicatorUse Text deduplicator to clean, transform or inspect text before it is reused. Remove duplicate lines with an optional custom delimiter.Text replacerUse Text replacer to clean, transform or inspect text before it is reused. Find and replace text in batches.Reverse and sort textUse Reverse and sort text to clean, transform or inspect text before it is reused. Reverse lines or sort them in ascending or descending order.Numbered textUse Numbered text to clean, transform or inspect text before it is reused. Add sequence numbers to lines of text.Text to HTMLUse Text to HTML to clean, transform or inspect text before it is reused. Convert plain text to safe, basic HTML.Special symbolsUse Special symbols to clean, transform or inspect text before it is reused. Browse and copy a local reference of special symbols.Emoji pickerUse Emoji picker to clean, transform or inspect text before it is reused. Browse and copy a local Emoji reference.Fancy text converterUse Fancy text converter to clean, transform or inspect text before it is reused. Create decorative English lettering with Unicode characters.Text statisticsUse Text statistics to clean, transform or inspect text before it is reused. Count characters, words and lines.Text similarity checkerUse Text similarity checker to clean, transform or inspect text before it is reused. Compare two text passages in the browser.Chinese-English typographyUse Chinese-English typography to clean, transform or inspect text before it is reused. Normalize common Chinese and English punctuation and spacing.Word frequencyUse Word frequency to clean, transform or inspect text before it is reused. Count the frequency of words in text.Simplified-Traditional converterUse Simplified-Traditional converter for a focused writing, language or pronunciation task in this browser. Convert locally with the built-in mapping of commonly used Chinese characters.Pinyin converterUse Pinyin converter for a focused writing, language or pronunciation task in this browser. Convert basic Chinese characters to Pinyin; the character table is being expanded.Cantonese pronunciation helperUse Cantonese pronunciation helper for a focused writing, language or pronunciation task in this browser. Provide pronunciation guidance from a local common-character table.Chinese idiom lookupUse Chinese idiom lookup for a focused writing, language or pronunciation task in this browser. Use an auditable built-in collection of common Chinese idioms.TranslationUse Translation for a focused writing, language or pronunciation task in this browser. Uses the free anonymous MyMemory API. Each request is limited to 500 bytes and the anonymous allowance is 5,000 characters per day; input is sent to a third-party translation service.Wubi lookupUse Wubi lookup for a focused writing, language or pronunciation task in this browser. Look up Wubi 86/98 codes locally with the published wubi-code 1.0.2 package (ISC); input is not uploaded.Pinyin initialsUse Pinyin initials for a focused writing, language or pronunciation task in this browser. Generate initial-letter guidance from Chinese text.Name to pinyinUse Name to pinyin for a focused writing, language or pronunciation task in this browser. Convert personal names to Pinyin locally as a reference.Number to EnglishUse Number to English for a focused writing, language or pronunciation task in this browser. Spell out integers in English amount notation.Random idiomUse Random idiom for a focused writing, language or pronunciation task in this browser. Select a random item from local idiom data.Random poem lineUse Random poem line for a focused writing, language or pronunciation task in this browser. Select a random item from local short-verse data.Motivational quoteUse Motivational quote for a focused writing, language or pronunciation task in this browser. Select a random item from local short-quote data.Daily quoteUse Daily quote for a focused writing, language or pronunciation task in this browser. Select a random item from local short-quote data.Movie lineUse Movie line for a focused writing, language or pronunciation task in this browser. Select a random item from local short-quote data.Random English sentenceUse Random English sentence for a focused writing, language or pronunciation task in this browser. Select a random item from local English-sentence data.
Units & Mathematics
Base converterUse Base converter for unit, numeric or engineering conversions and copy the local result. Convert values between bases 2 and 36.Length converterUse Length converter for unit, numeric or engineering conversions and copy the local result. Convert common length units.Area converterUse Area converter for unit, numeric or engineering conversions and copy the local result. Convert common area units.Volume converterUse Volume converter for unit, numeric or engineering conversions and copy the local result. Convert common volume units.Weight converterUse Weight converter for unit, numeric or engineering conversions and copy the local result. Convert common weight units.Density converterUse Density converter for unit, numeric or engineering conversions and copy the local result. Convert common density units.Temperature converterUse Temperature converter for unit, numeric or engineering conversions and copy the local result. Convert Celsius, Fahrenheit and Kelvin.Pressure converterUse Pressure converter for unit, numeric or engineering conversions and copy the local result. Convert common pressure units.Byte converterUse Byte converter for unit, numeric or engineering conversions and copy the local result. Convert decimal and binary data-storage units.Time unit converterUse Time unit converter for unit, numeric or engineering conversions and copy the local result. Convert seconds, minutes, hours and days.English counting unitsUse English counting units for unit, numeric or engineering conversions and copy the local result. Compare English and Chinese large-number units.Coordinate converterUse Coordinate converter for unit, numeric or engineering conversions and copy the local result. Convert common coordinate formats approximately.Cuboid calculatorUse Cuboid calculator for unit, numeric or engineering conversions and copy the local result. Calculate cuboid volume, surface area and diagonal.Battery capacity converterUse Battery capacity converter for unit, numeric or engineering conversions and copy the local result. Convert battery charge and energy from supplied parameters.Percentage CalculatorCalculate percentage portions, shares and changes. Change uses the absolute original value; zero denominators are rejected.Mean CalculatorCalculate count, arithmetic mean, minimum and maximum for up to 10,000 values. Invalid data is rejected, not treated as zero.Standard Deviation CalculatorShow population and sample standard deviation. The sample calculation uses n−1 and requires at least two values.Electricity Cost CalculatorEstimate energy and cost from watts, daily operating hours, days and an entered kWh price. Regional tiered tariffs are not applied automatically.
Development & Encoding
Naming converterUse Naming converter to inspect, format or transform developer content locally in the browser. Convert between common code-naming conventions.JSON editorUse JSON editor to inspect, format or transform developer content locally in the browser. Validate and format JSON locally.CSS formatterUse CSS formatter to inspect, format or transform developer content locally in the browser. Apply basic CSS indentation formatting.JSON formatterUse JSON formatter to inspect, format or transform developer content locally in the browser. Format or minify JSON.JavaScript formatterUse JavaScript formatter to inspect, format or transform developer content locally in the browser. Apply basic JavaScript indentation formatting.HTML formatterUse HTML formatter to inspect, format or transform developer content locally in the browser. Apply basic HTML indentation formatting.SQL formatterUse SQL formatter to inspect, format or transform developer content locally in the browser. Apply basic SQL keyword formatting.Regular expression testerUse Regular expression tester to inspect, format or transform developer content locally in the browser. Test regular-expression matches in the browser.Crontab schedule helperUse Crontab schedule helper to inspect, format or transform developer content locally in the browser. Parse common five-field Cron expressions.JSON to TypeScriptUse JSON to TypeScript to inspect, format or transform developer content locally in the browser. Infer basic TypeScript types from JSON.Base64 encoder and decoderUse Base64 encoder and decoder for encoding, hashing or local encryption without uploading text or keys. Encode and decode Base64 locally in the browser.MD5 hashUse MD5 hash for encoding, hashing or local encryption without uploading text or keys. Calculate an MD5 digest locally without uploading input.AES encrypt and decryptUse AES encrypt and decrypt for encoding, hashing or local encryption without uploading text or keys. Encrypt and decrypt locally with Web Crypto AES-GCM.SHA-1 hashUse SHA-1 hash for encoding, hashing or local encryption without uploading text or keys. Calculate a SHA-1 digest locally.ASCII and UnicodeUse ASCII and Unicode for encoding, hashing or local encryption without uploading text or keys. Convert between text and Unicode code-point notation.Full-width and half-widthUse Full-width and half-width for encoding, hashing or local encryption without uploading text or keys. Convert common full-width and half-width characters.URL encoder and decoderUse URL encoder and decoder for encoding, hashing or local encryption without uploading text or keys. Encode and decode URLs locally in the browser.Morse codeUse Morse code for encoding, hashing or local encryption without uploading text or keys. Encode and decode basic Chinese and English Morse representations.Random password generatorUse Random password generator for encoding, hashing or local encryption without uploading text or keys. Generate passwords with browser cryptographic randomness.Random number generatorUse Random number generator for encoding, hashing or local encryption without uploading text or keys. Generate secure random numbers within a range.GUID generatorUse GUID generator for encoding, hashing or local encryption without uploading text or keys. Generate UUIDs or GUIDs locally in the browser.JWT DecoderDecode JWT headers and payloads locally and inspect common timestamp claims. Decoding does not verify the signature.YAML Formatter & ConverterFormat and validate YAML locally and convert between YAML and JSON.XML Formatter & ConverterFormat and validate XML locally and convert to/from JSON with explicit attribute, text and repeated-node rules.CSV Viewer & ConverterView CSV tables in the browser and convert to/from JSON arrays with common delimiters.Text DiffCompare two texts line by line and mark additions, deletions and changes; this is not a similarity score.JSON DiffCompare JSON structures by key path while preserving array order semantics by default.Markdown Live PreviewEdit and preview Markdown locally without executing scripts from the input; HTML output is sanitized before copying.SemVer ComparatorCompare semantic versions, prereleases and common version ranges.MIME Type LookupLook up common extension/MIME mappings. A mapping does not prove a file’s actual content.File Signature DetectorInspect local file signatures and compare filename extension, browser MIME and detected type without uploading the file.Punycode / IDN ConverterConvert Unicode domains to/from ASCII/Punycode and flag possible confusable characters without claiming security verification.HTML Entity Encoder & DecoderConvert locally between plain text and common named or numeric HTML entities.X.509 / CSR ParserParse PEM certificates and CSRs locally for subject, issuer, SANs, validity, algorithms and fingerprints; private keys are not accepted.SHA-2 / HMAC / File ChecksumUse browser Web Crypto for SHA-256/384/512, HMAC and file digests without uploading content or keys.
Network Lookup & Planning
Network lookup 15
IP address lookupUse IP address lookup for a browser-based web or network helper without logging pasted content by default. Uses the free public ipwho.is API. On request, the IP passes through this site to the provider; locations are approximate and query values are not stored.My IP addressUse My IP address for a browser-based web or network helper without logging pasted content by default. Compare the browser public VPN/international and domestic/direct exits, with IPv6, public sources and connectivity checks. Local-network addresses are neither read nor stored.Split-tunnel testUse Split-tunnel test for a browser-based web or network helper without logging pasted content by default. Compare IPv4, IPv6 and public exits using fixed free public echo probes. This is not a complete VPN route scan; probe failures are shown explicitly.Multi-egress IP lookupUse Multi-egress IP lookup for a browser-based web or network helper without logging pasted content by default. Load the source site public free-probe list and query eligible WebSocket probes one at a time for exit IPs. Private source APIs are not used; failures and timeouts are shown per probe.CDN edge node lookupUse CDN edge node lookup for a browser-based web or network helper without logging pasted content by default. Request fixed public CDN test resources and inspect exposed response headers, status and latency. Browser cross-origin rules may hide the specific node.DNS egress lookupUse DNS egress lookup for a browser-based web or network helper without logging pasted content by default. Use fixed public DNS-leak probes to identify visible recursive DNS exits. Results depend on browser, network and third-party probes; addresses are not stored.WebRTC (UDP) IP lookupUse WebRTC (UDP) IP lookup for a browser-based web or network helper without logging pasted content by default. Discover ICE addresses with fixed STUN servers and browser RTCPeerConnection. Browser mDNS or policy may hide addresses.IP insightUse IP insight for a browser-based web or network helper without logging pasted content by default. Compare location, ASN and provider across fixed free public IP-data sources. The queried IP passes through this site to the providers and is not stored.Domain WHOIS lookupUse Domain WHOIS lookup for a browser-based web or network helper without logging pasted content by default. Use IANA RDAP bootstrap and public rdap.org queries. On request, the domain passes through this site to registry services and is not stored.Domain filing lookupUse Domain filing lookup for a browser-based web or network helper without logging pasted content by default. Use the currently available free anonymous UApiPro allowance for reference ICP filing data. Dynamic rate limits apply; this is not a live official government verification.Image ALT replacerUse Image ALT replacer for a browser-based web or network helper without logging pasted content by default. Add alt attributes to local HTML in batches.User-Agent viewerUse User-Agent viewer for a browser-based web or network helper without logging pasted content by default. Read only the current browser public User-Agent string.Contact information extractorUse Contact information extractor for a browser-based web or network helper without logging pasted content by default. Parse user-pasted text locally for contact details.Open URLs in batchUse Open URLs in batch for a browser-based web or network helper without logging pasted content by default. Open only the links entered by the user, one by one.MAC vendor lookupUse MAC vendor lookup for a browser-based web or network helper without logging pasted content by default. Use built-in samples of public OUI prefixes and flag unknown vendors.
Network Planning 15
IPv4/IPv6 Dual-Stack Subnet PlannerPlan matching IPv4 and IPv6 subnets and list network ranges, usable hosts, broadcasts, and IPv6 child prefixes.VLSM Address PlannerAllocate differently sized host requirements inside one IPv4 pool using variable-length subnet masks.Subnet Mask / CIDR / Wildcard ConverterConvert between CIDR prefix length, dotted-decimal subnet mask, and ACL wildcard mask.IP Range Overlap & Conflict CheckerCompare two IPv4 CIDR blocks and identify overlap, containment, separation, and the intersection range.MTU / MSS / Protocol Overhead AnalyzerEstimate effective MSS, payload efficiency, and fragmentation risk for IP and tunnel overhead.Mbps and PPS CalculatorConvert link speed and frame size to packets per second while accounting for Layer 2 wire overhead.File Transfer Time EstimatorEstimate transfer time from data size, available bandwidth, link utilization, and protocol efficiency.IPv4 Range & Route SummaryCalculate the smallest covering CIDR and address counts for an IPv4 range.IPv4 CIDR SplitterSplit an IPv4 CIDR into child prefixes and list requested subnets.IPv6 Compress, Expand & Type CheckerNormalize an IPv6 address and classify its major address type.IPv6 ULA Prefix PlannerBuild deterministic ULA /48 and /64 prefixes from supplied identifiers.DHCP Pool & Capacity PlannerPlan an IPv4 DHCP pool after start/end reservations and check client capacity.Bandwidth-delay Product & TCP WindowCalculate bandwidth-delay product, TCP window, and parallel stream count.Switch Fabric & Forwarding Capacity CheckerCheck switch fabric and packet-forwarding capacity against entered port load.Switch Stack Bandwidth & Failure MarginCheck stack bandwidth from member demand, links, capacity, and reserve.
Interactive & Productivity
24-point calculatorUse 24-point calculator for unit, numeric or engineering conversions and copy the local result. Use four integers, arithmetic operations and parentheses to make 24; includes a local practice game.Reaction speed testUse Reaction speed test for a small everyday reference or calculation; coverage follows the page note. Measure response time locally in the browser; results are not uploaded.Typing Speed TestType a fixed passage for 60 seconds and inspect correct characters, errors, accuracy and CPM. English WPM uses five-character words.Random Wheel SpinnerEnter one option per line and draw with browser cryptographic randomness. Each row has equal weight, including duplicates. Not certified for regulated draws.Reading Time CalculatorEstimate reading time from adjustable Han-character and other-language word rates. This is an estimate, not a reading-ability assessment.Screen & Audio RecorderRecord a shared screen or microphone with browser permission, then stop, preview and download locally without automatic upload.Invoice Print Layout AssistantBatch PDFs or images, choose 0°/90° print orientation automatically, arrange 1-up/2-up A4 pages, allow manual rotation overrides and export a print-ready PDF.