Tools for focused work
Search calculators, converters and utilities. Your input stays in your browser whenever possible.
210 tools found
JSON Formatter
Format, validate and minify JSON with clear error messages.
Base64 Converter
Encode text to Base64 or decode it locally in your browser.
Case Converter
Convert text to upper, lower, title, camel, snake or kebab case.
Percentage Calculator
Calculate percentages, increases and decreases instantly.
BMI Calculator
Calculate body mass index and view the standard range.
Unix Timestamp Converter
Convert Unix timestamps and local date times in both directions.
Word Counter
Count words, characters, lines and estimated reading time.
UUID Generator
Generate secure UUID v4 identifiers in batches.
URL Encoder & Decoder
Encode or decode URL components safely in your browser.
HTML Entity Converter
Escape HTML characters or convert entities back to text.
Hash Generator
Generate SHA-256, SHA-384 and SHA-512 hashes locally.
Regular Expression Tester
Test regular expressions with flags and highlighted match details.
Number Base Converter
Convert integers between binary, octal, decimal and hexadecimal.
Password Generator
Create strong cryptographically random passwords with custom options.
Lorem Ipsum Generator
Generate placeholder paragraphs for layouts and prototypes.
Random Number Generator
Generate unbiased random integers within a selected range.
Length Converter
Convert metric and imperial units with instant precision.
Temperature Converter
Convert Celsius, Fahrenheit and Kelvin temperatures.
Compound Interest Calculator
Project investment growth with regular contributions.
Loan Payment Calculator
Estimate monthly payments, total interest and repayment cost.
Date Difference Calculator
Find the exact number of days between two dates.
Age Calculator
Calculate age in years, months and days from a birth date.
Image Resizer
Resize JPG, PNG and WebP images locally with aspect ratio control.
Grayscale Image Converter
Turn photos and avatars grayscale without uploading them.
Image to Base64
Convert image files to Base64 data URLs in your browser.
IP Address Lookup
View your public IP and Cloudflare request location details.
Random Choice Picker
Paste a list and pick one option with secure randomness.
Coin Flip
Flip a fair virtual coin for quick two-way decisions.
YAML & JSON Converter
Convert structured data between YAML and JSON with syntax validation.
SQL Formatter
Format SQL queries for popular database dialects.
JWT Decoder
Inspect JWT headers, payloads and expiration locally without verification.
Text Difference Checker
Compare two texts and highlight additions, removals and unchanged content.
Markdown Previewer
Write Markdown and view a sanitized HTML preview side by side.
CSV Viewer
Open CSV text or files in a searchable, structured table.
QR Code Generator
Generate downloadable QR codes from URLs, text and contact information.
Online Calculator
Run basic arithmetic expressions with instant results.
VAT Calculator
Add or remove VAT and sales tax from a price.
Discount Calculator
Calculate sale price, savings and final payable amount.
Area Calculator
Calculate rectangle, circle and triangle areas.
Business Days Calculator
Count weekdays between two dates, inclusive.
Countdown Timer
Track the remaining days, hours, minutes and seconds to a target time.
Duplicate Line Remover
Remove duplicate lines while preserving the first occurrence.
Line Sorter
Sort text lines ascending or descending with numeric awareness.
Email Validator
Check whether one or many email addresses have a valid format.
Slug Generator
Convert titles into lowercase URL-friendly slugs.
Domain Extractor
Extract clean hostnames from URLs and pasted link lists.
Color Converter
Convert between HEX and RGB color values.
Rotate & Flip Image
Rotate, flip and export images locally in your browser.
ID Card Gender Lookup
Validate a Chinese ID number locally and read its gender, birth date and sequence code.
Bra Size Calculator
Convert bust measurements into Chinese, international, UK and Japanese sizes.
Trigonometry Calculator
Evaluate sin, cos, tan and their inverses in degrees or radians.
Net Profit Margin Calculator
Work out net profit and margin from revenue, costs, expenses and taxes.
Gross Margin Calculator
Compute gross profit and margin, or set a price from a target margin.
Take Profit & Stop Loss Calculator
Set take-profit and stop-loss prices and see expected P&L and risk-reward ratio.
Tax Rate Calculator
Convert between net, gross and tax amounts, or derive the tax rate itself.
RMB Uppercase Converter
Turn numeric amounts into formal Chinese uppercase RMB wording.
RMB Case Converter
Convert between numeric amounts and Chinese uppercase RMB in both directions.
Surname Stroke Sorter
Sort a list of Chinese names by the stroke count of each surname.
ASCII Art Generator
Turn JPG, PNG and WebP images into ASCII art locally, with copy and text download.
Image Mosaic Tool
Brush over private areas of a photo to pixelate them, all in your browser.
Photo Time & Place Watermark
Stamp photos with editable time and location text you can drag, rotate and style.
Text Avatar Generator
Create monogram avatars from one to four characters with preset colors and shapes.
Santa Hat Avatar Maker
Draw a Santa hat onto your avatar locally, then drag, resize and rotate it.
What to Eat Wheel
Spin a colorful wheel with lunch and dinner presets to pick your next meal.
Screen Tester
Run fullscreen solid color, gradient and checkerboard screens to find dead pixels and backlight bleed.
Feels Like Temperature Calculator
Combine air temperature, humidity and wind into a NOAA feels-like value with health risk guidance.
Inverse Proportion Calculator
Solve x₁·y₁ = x₂·y₂ problems with the working steps shown.
Direct Proportion Calculator
Solve y = k·x proportion problems with the rule-of-three steps shown.
Online Ruler
A screen ruler in cm, mm and inch, with credit-card calibration saved in your browser.
Equal Principal Loan Calculator
Build a full equal-principal repayment schedule with decreasing monthly payments and total interest.
Salary Raise Calculator
Turn a raise percentage into new pay, or reverse-engineer the raise, and compare two offers side by side.
7-Day Annualized Yield Calculator
Convert between 7-day annualized yield and per-10000 earnings, and estimate daily, monthly and yearly returns.
Table Turnover Rate Calculator
Measure restaurant table turnover, daily serving capacity and utilization from your opening hours.
Online Protractor
Drag two rays on a semicircle protractor to measure angles and supplementary angles live.
Rent-to-Sale Ratio Calculator
Compare monthly rent with house price to get the rent-to-sale ratio, annual yield and payback years.
Repurchase Rate Calculator
Compute repeat purchase rates for up to six periods and see the trend at a glance.
CBM Calculator
Add up carton volumes in cubic meters and work out ocean freight chargeable weight.
Radian & Degree Converter
Convert between degrees and radians with π notation support and a common angle table.
E-commerce Profit Calculator
Work out per-order profit, margin and ad ROI after commission, shipping and returns, and compare up to three groups.
Mirage Tank Image Generator
Hide two pictures in one image: the front shows on white, the inner on black. Also extracts existing mirage images.
Grid Image Cutter
Split one image into 3×3 or 2×2 equal slices with per-slice and batch downloads.
WebP to PNG Converter
Convert one or many WebP images to PNG locally with per-file and batch downloads.
Barcode Generator
Type text and get a CODE128 barcode live, with adjustable size and PNG or SVG download.
Image Color Picker
Pick pixel colors from an uploaded, dropped or pasted image in HEX, RGB and HSL, plus dominant palette extraction.
SVG to ICO Converter
Turn an SVG file or pasted SVG source into a multi-size favicon .ico file locally.
Perfect Circle Challenge
Draw a freehand circle and get an instant roundness score with a best-fit reference circle.
Perler Beads Pattern Maker
Turn a photo into a bead-by-bead pattern with a ~40-color Perler/Hama palette, code labels and usage counts.
QR Code Decoder
Decode QR codes from uploaded, dropped or pasted images locally via the browser BarcodeDetector API.
YouTube Thumbnail Downloader
Paste any YouTube link and grab every available thumbnail resolution, from maxres down to default.
Bilibili Cover Extractor
Fetch the original cover image and title of a Bilibili video from its BV id, av id or link.
Waifu Avatar Generator
Generate cute anime-style avatars locally from layered vector parts, then download as PNG or SVG.
Online CAD Viewer (DXF)
Open DXF drawings in the browser: renders LINE, CIRCLE, ARC, LWPOLYLINE and ELLIPSE with zoom and pan.
Malta Address Generator
Generate virtual Malta addresses and test identity data with street, postcode, phone and email, for development and testing.
Iran Address Generator
Generate virtual Iran addresses and test identity data with street, postcode, phone and email, for development and testing.
Bangladesh Address Generator
Generate virtual Bangladesh addresses and test identity data with street, postcode, phone and email, for development and testing.
Turkey Address Generator
Generate virtual Turkey addresses and test identity data with street, postcode, phone and email, for development and testing.
Philippines Address Generator
Generate virtual Philippines addresses and test identity data with street, postcode, phone and email, for development and testing.
Vietnam Address Generator
Generate virtual Vietnam addresses and test identity data with street, postcode, phone and email, for development and testing.
Pakistan Address Generator
Generate virtual Pakistan addresses and test identity data with street, postcode, phone and email, for development and testing.
Ethiopia Address Generator
Generate virtual Ethiopia addresses and test identity data with street, postcode, phone and email, for development and testing.
Taiwan Address Generator
Generate virtual Taiwan addresses and test identity data with street, postcode, phone and email, for development and testing.
Ukraine Address Generator
Generate virtual Ukraine addresses and test identity data with street, postcode, phone and email, for development and testing.
Spain Address Generator
Generate virtual Spain addresses and test identity data with street, postcode, phone and email, for development and testing.
Greenland Address Generator
Generate virtual Greenland addresses and test identity data with street, postcode, phone and email, for development and testing.
Curaçao Address Generator
Generate virtual Curaçao addresses and test identity data with street, postcode, phone and email, for development and testing.
Wales Address Generator
Generate virtual Wales addresses and test identity data with street, postcode, phone and email, for development and testing.
Malaysia Address Generator
Generate virtual Malaysia addresses and test identity data with street, postcode, phone and email, for development and testing.
DR Congo Address Generator
Generate virtual DR Congo addresses and test identity data with street, postcode, phone and email, for development and testing.
India Address Generator
Generate virtual India addresses and test identity data with street, postcode, phone and email, for development and testing.
Thailand Address Generator
Generate virtual Thailand addresses and test identity data with street, postcode, phone and email, for development and testing.
Dubai Address Generator
Generate virtual local Dubai addresses and test identity data with street, postcode, phone and email, for development and testing.
Russia Address Generator
Generate virtual Russia addresses and test identity data with street, postcode, phone and email, for development and testing.
France Address Generator
Generate virtual France addresses and test identity data with street, postcode, phone and email, for development and testing.
Canada Address Generator
Generate virtual Canada addresses and test identity data with street, postcode, phone and email, for development and testing.
Nigeria Address Generator
Generate virtual Nigeria addresses and test identity data with street, postcode, phone and email, for development and testing.
Cambodia Address Generator
Generate virtual Cambodia addresses and test identity data with street, postcode, phone and email, for development and testing.
Japan Address Generator
Generate virtual Japan addresses and test identity data with street, postcode, phone and email, for development and testing.
Poland Address Generator
Generate virtual Poland addresses and test identity data with street, postcode, phone and email, for development and testing.
Saudi Arabia Address Generator
Generate virtual Saudi Arabia addresses and test identity data with street, postcode, phone and email, for development and testing.
Czechia Address Generator
Generate virtual Czechia addresses and test identity data with street, postcode, phone and email, for development and testing.
Macau Address Generator
Generate virtual Macau addresses and test identity data with street, postcode, phone and email, for development and testing.
Mexico Address Generator
Generate virtual Mexico addresses and test identity data with street, postcode, phone and email, for development and testing.
Cape Verde Address Generator
Generate virtual Cape Verde addresses and test identity data with street, postcode, phone and email, for development and testing.
Israel Address Generator
Generate virtual Israel addresses and test identity data with street, postcode, phone and email, for development and testing.
Somaliland Address Generator
Generate virtual Somaliland addresses and test identity data with street, postcode, phone and email, for development and testing.
Netherlands Address Generator
Generate virtual Netherlands addresses and test identity data with street, postcode, phone and email, for development and testing.
South Korea Address Generator
Generate virtual South Korea addresses and test identity data with street, postcode, phone and email, for development and testing.
Romania Address Generator
Generate virtual Romania addresses and test identity data with street, postcode, phone and email, for development and testing.
Germany Address Generator
Generate virtual Germany addresses and test identity data with street, postcode, phone and email, for development and testing.
Ireland Address Generator
Generate virtual Ireland addresses and test identity data with street, postcode, phone and email, for development and testing.
Northern Ireland Address Generator
Generate virtual Northern Ireland addresses and test identity data with street, postcode, phone and email, for development and testing.
United Kingdom Address Generator
Generate virtual United Kingdom addresses and test identity data with street, postcode, phone and email, for development and testing.
Scotland Address Generator
Generate virtual Scotland addresses and test identity data with street, postcode, phone and email, for development and testing.
Hong Kong Address Generator
Generate virtual Hong Kong addresses and test identity data with street, postcode, phone and email, for development and testing.
Belgium Address Generator
Generate virtual Belgium addresses and test identity data with street, postcode, phone and email, for development and testing.
Iceland Address Generator
Generate virtual Iceland addresses and test identity data with street, postcode, phone and email, for development and testing.
Croatia Address Generator
Generate virtual Croatia addresses and test identity data with street, postcode, phone and email, for development and testing.
South Africa Address Generator
Generate virtual South Africa addresses and test identity data with street, postcode, phone and email, for development and testing.
Italy Address Generator
Generate virtual Italy addresses and test identity data with street, postcode, phone and email, for development and testing.
Indonesia Address Generator
Generate virtual Indonesia addresses and test identity data with street, postcode, phone and email, for development and testing.
North Macedonia Address Generator
Generate virtual North Macedonia addresses and test identity data with street, postcode, phone and email, for development and testing.
Singapore Address Generator
Generate virtual Singapore addresses and test identity data with street, postcode, phone and email, for development and testing.
Albania Address Generator
Generate virtual Albania addresses and test identity data with street, postcode, phone and email, for development and testing.
Egypt Address Generator
Generate virtual Egypt addresses and test identity data with street, postcode, phone and email, for development and testing.
Haiti Address Generator
Generate virtual Haiti addresses and test identity data with street, postcode, phone and email, for development and testing.
Portugal Address Generator
Generate virtual Portugal addresses and test identity data with street, postcode, phone and email, for development and testing.
England Address Generator
Generate virtual England addresses and test identity data with street, postcode, phone and email, for development and testing.
Bosnia and Herzegovina Address Generator
Generate virtual Bosnia and Herzegovina addresses and test identity data with street, postcode, phone and email, for development and testing.
Norway Address Generator
Generate virtual Norway addresses and test identity data with street, postcode, phone and email, for development and testing.
Venezuela Address Generator
Generate virtual Venezuela addresses and test identity data with street, postcode, phone and email, for development and testing.
Argentina Address Generator
Generate virtual Argentina addresses and test identity data with street, postcode, phone and email, for development and testing.
United States Address Generator
Generate virtual United States addresses and test identity data with street, postcode, phone and email, for development and testing.
Cuba Address Generator
Generate virtual Cuba addresses and test identity data with street, postcode, phone and email, for development and testing.
Austria Address Generator
Generate virtual Austria addresses and test identity data with street, postcode, phone and email, for development and testing.
Brazil Address Generator
Generate virtual Brazil addresses and test identity data with street, postcode, phone and email, for development and testing.
Sweden Address Generator
Generate virtual Sweden addresses and test identity data with street, postcode, phone and email, for development and testing.
Tokyo Address Generator
Generate virtual local Tokyo addresses and test identity data with street, postcode, phone and email, for development and testing.
Real US Address Generator
Generate realistic-looking US addresses and test identity data with street, ZIP code, phone and email, for development and testing.
US Tax-Free State Address Generator
Generate virtual addresses in the five US states with no statewide sales tax: Oregon, Delaware, Montana, New Hampshire and Alaska.
Los Angeles Address Generator
Generate virtual local Los Angeles addresses and test identity data with street, postcode, phone and email, for development and testing.
Houston Address Generator
Generate virtual local Houston addresses and test identity data with street, postcode, phone and email, for development and testing.
Atlanta Address Generator
Generate virtual local Atlanta addresses and test identity data with street, postcode, phone and email, for development and testing.
New York Address Generator
Generate virtual local New York addresses and test identity data with street, postcode, phone and email, for development and testing.
Chicago Address Generator
Generate virtual local Chicago addresses and test identity data with street, postcode, phone and email, for development and testing.
Portland Address Generator
Generate virtual local Portland addresses and test identity data with street, postcode, phone and email, for development and testing.
New Hampshire Address Generator
Generate virtual local New Hampshire addresses and test identity data with street, postcode, phone and email, for development and testing.
Miami Address Generator
Generate virtual local Miami addresses and test identity data with street, postcode, phone and email, for development and testing.
Dallas Address Generator
Generate virtual local Dallas addresses and test identity data with street, postcode, phone and email, for development and testing.
San Francisco Address Generator
Generate virtual local San Francisco addresses and test identity data with street, postcode, phone and email, for development and testing.
Detroit Address Generator
Generate virtual local Detroit addresses and test identity data with street, postcode, phone and email, for development and testing.
Phoenix Address Generator
Generate virtual local Phoenix addresses and test identity data with street, postcode, phone and email, for development and testing.
San Jose Address Generator
Generate virtual local San Jose addresses and test identity data with street, postcode, phone and email, for development and testing.
Seattle Address Generator
Generate virtual local Seattle addresses and test identity data with street, postcode, phone and email, for development and testing.
Oregon Address Generator
Generate virtual local Oregon addresses and test identity data with street, postcode, phone and email, for development and testing.
Delaware Address Generator
Generate virtual local Delaware addresses and test identity data with street, postcode, phone and email, for development and testing.
Montana Address Generator
Generate virtual local Montana addresses and test identity data with street, postcode, phone and email, for development and testing.
Alaska Address Generator
Generate virtual local Alaska addresses and test identity data with street, postcode, phone and email, for development and testing.
Chinese Name Generator
Batch-generate random Chinese names with gender, surname and length options, then export as CSV, JSON or TXT.
JSON to TOON Converter
Convert JSON into the compact Token-Oriented Object Notation for LLM prompts, with token savings estimate.
Sam's Club China Locations
Browse and search the directory of Sam's Club stores in China by city, name or address.
Super Lotto Quick Pick
Random picks for Super Lotto (5 from 1–35 plus 2 from 1–12), with multi-ticket generation and draw simulation. For entertainment only.
Double Color Ball Quick Pick
Random picks for Double Color Ball (6 red from 1–33 plus 1 blue from 1–16), with draw simulation. For entertainment only.
Happy 8 Quick Pick
Random picks for Happy 8: choose 1–10 unique numbers from 1–80, generate multiple tickets and simulate a draw. For entertainment only.
Pailie 3 Quick Pick
Random three-digit picks for Pailie 3 (0–9 per position, repeats allowed). For entertainment only.
Pailie 5 Quick Pick
Random five-digit picks for Pailie 5 (0–9 per position, repeats allowed). For entertainment only.
Qixingcai Quick Pick
Random picks for Qixingcai: six digits 0–9 plus a special number from 0–14. For entertainment only.
Qilecai Quick Pick
Random picks for Qilecai: 7 unique numbers from 1–30, with draw simulation. For entertainment only.
Fucai 3D Quick Pick
Random three-digit picks for Fucai 3D (0–9 per position, repeats allowed). For entertainment only.
Mid-Autumn Bo Bing Dice
Roll six dice in the Xiamen Mid-Autumn folk game Bo Bing, with automatic prize judging from 一秀 up to 状元插金花. For entertainment only.
Text Line Splitter
Split long text into lines every N characters or N words, with a custom separator and segment count.
Reading Time Calculator
Estimate silent reading and read-aloud time from text, with adjustable Chinese and English speeds.
Online Teleprompter
Scroll your script full screen with adjustable font size, speed, mirror flip and light or dark theme.
Driving Restriction Lookup
Check Beijing tail-number rotation and generic odd-even restrictions by date and plate tail.
Online Notepad
Write notes that auto-save in your browser, with word and line counts, download and dark mode.
Chinese Stroke Order
Animate the stroke order of any common Chinese character and see its stroke count.
Hanzi Combination Lookup
Find which character two components form, like 口 + 天, or split a character back into parts.
Serial Code Generator
Batch-generate unique anti-counterfeit, activation or coupon codes from a pattern, with copy and CSV/TXT export.
Local Video Player
Play local video files without uploading: speed control, fullscreen, PNG snapshots, timestamp notes and SRT/VTT subtitles.
Local Audio Player
Play local audio with a waveform view, A-B loop and synced LRC lyrics — all offline in your browser.
M3U8 Player
Play HLS .m3u8 streams with bitrate, fragment and error diagnostics plus CORS troubleshooting hints.
Analog Clock
A live analog clock with smooth sweeping hands, multiple dial styles and world time zones.
Wooden Fish
Knock a virtual wooden fish with synthesized sound, floating merit +1 and daily merit counter.
Sudoku Game
Play sudoku with three difficulties, notes, undo/redo, hints, conflict highlighting and a timer.
Delta Force Name Generator
Generate game ID variants that look identical but differ, using zero-width characters, lookalike letters and ornaments.
Tier List Maker
Rank anything in editable tier rows with text or image chips, drag to reorder and export a PNG meme image.
Fill Light Simulator
Turn your screen into a fill light with warm/cool/pink colors, brightness control and fullscreen mode for selfies and streams.
Gaokao Countdown
China’s national college entrance exam starts on June 7 every year. Live day/hour/minute/second countdown with a fullscreen mode.
Spring Festival Countdown
Countdown to Chinese New Year, the first day of the lunar calendar. Live day/hour/minute/second countdown with a fullscreen mode.
Christmas Countdown
Countdown to Christmas Day on December 25. Live day/hour/minute/second countdown with a fullscreen mode.
New Year Countdown
Countdown to New Year’s Day on January 1. Live day/hour/minute/second countdown with a fullscreen mode.