Free tools for everyday tasks

Everyday math: percentages, splitting a bill, loan payments, tax, BMI, age, paint coverage, sleep cycles, and counting down the days until any date.

• Days Until CalculatorCount down the days, weeks and months until any future date.
• Paint & Wallpaper Coverage CalculatorEstimate wall paint in gallons or liters, or wallpaper rolls with repeat and trimming allowances.
• Discount & Sale Price CalculatorWork out a sale price from an original price and a discount percentage, or the percentage off between two prices.
• BMI CalculatorWork out Body Mass Index from height and weight, in metric or imperial, with the standard adult category.

Units, colors, timestamps, and other quick conversions: number bases, images, dates, time zones, CSV/JSON, and everyday cooking conversions.

• Gas Mark ConverterConvert oven temperatures between gas mark, °C, °F and fan °C.
• Kilograms to PoundsConvert kilograms to pounds instantly, or swap to convert pounds to kilograms.
• Centimeters to InchesConvert centimeters to inches instantly, or swap to convert inches to centimeters.
• Celsius to FahrenheitConvert Celsius to Fahrenheit instantly, or swap to convert Fahrenheit to Celsius.

Measure map area and perimeter, convert GPS coordinates, find distance between two points, or draw a radius circle.

• Map Area & Perimeter CalculatorDraw a boundary on a map to measure area in acres, hectares or square feet and calculate its perimeter.
• Distance Between Two PointsMeasure the distance between two map points or GPS coordinates in miles, kilometers, meters or nautical miles.
• GPS Coordinate ConverterConvert latitude and longitude between decimal degrees and degrees, minutes and seconds.
• Map Radius CalculatorDraw a radius circle around a map location in miles, kilometers or meters.

Fair, instant randomness and a bit of fun: spin a wheel to pick a name, roll dice, flip a coin, draw random numbers, split a group into teams, and restyle text for bios.

• Random Number GeneratorPick one or many random whole numbers in any range, with optional no-repeats and sorting.
• Dice RollerRoll virtual dice from d4 to d100, or any dice notation like 2d6+3 and 4d6kh3.
• Coin FlipFlip a fair coin for heads or tails, or flip up to 1,000 coins and see the counts and streaks.
• Random Team GeneratorSplit a list of names into random, evenly sized teams, by number of teams or people per team.

Transform, inspect, and clean up prose and plain text: case conversion, word and character counts, slugify, text diffing, and live Markdown preview.

• Lorem Ipsum GeneratorGenerate classic lorem ipsum filler text as paragraphs, sentences, words or list items.
• Case ConverterConvert text between camelCase, snake_case, kebab-case, Title Case and more.
• Character CounterCount characters with and without spaces and check text against X, SMS and meta-description limits.
• Remove Duplicate LinesDelete repeated lines from a list and keep the first of each.

Color, contrast, and visual-design helpers for the web: color conversion, WCAG contrast checking, and CSS gradient, box-shadow, and border-radius generators.

• Aspect Ratio CalculatorSolve the missing width, height or ratio, reduce W:H to lowest terms and scale to fit.
• Color ConverterConvert a color between HEX, RGB, HSL and OKLCH.
• Color Contrast CheckerCheck a text and background color pair against the WCAG 2.1 contrast thresholds, with a nearest-passing suggestion.
• CSS Gradient GeneratorBuild a linear or radial CSS gradient with multiple color stops and copy the code.

Everyday utilities for building and debugging on the web: JSON formatting and diffing, regex testing, UUID generation, cron parsing, and format converters.

• JSON Schema ValidatorValidate a JSON document against a Draft 2020-12 schema, with precise paths for every issue.
• Regex TesterTest a JavaScript regular expression against sample text with live match highlighting.
• UUID GeneratorGenerate v1-v7 UUIDs (RFC 9562) or decode any UUID's version, variant and timestamp.
• Cron Expression ParserExplain a cron expression in plain English and show the next run times.

Structured data, meta tags, robots rules, and SERP previews: JSON-LD tools, meta tag and sitemap generators, robots.txt testing, and redirect checking.

• JSON-LD Schema GeneratorBuild schema.org JSON-LD for Article, FAQ, Breadcrumb, Organization, LocalBusiness and Product.
• JSON-LD ValidatorCheck JSON-LD syntax and selected structure and Google-feature rules for six schema.org types.
• Meta Tag GeneratorGenerate the title, description, canonical, Open Graph and Twitter Card tags for a page's <head>.
• SERP Snippet PreviewPreview how a page's title and description render in Google results, with pixel-width truncation.

Hashing, tokens, certificates, and vulnerability scoring in your browser: JWT/JWKS tools, password generators, CSR/X.509 decoders, CVSS/SSVC calculators.

• JWT DecoderDecode a JSON Web Token's header and payload without verifying the signature.
• JWKS Key Set ViewerDecode a JWKS key set — kid, kty, alg, use, key_ops, x5c chains — and convert JWK ↔ PEM.
• Basic Auth Header GeneratorBuild an Authorization: Basic header (RFC 7617), or decode one back to user and password.
• JWT GeneratorSign a JWT with HS256 in your browser — custom claims, expiry and iat.

Subnetting, IP addressing, and DNS helpers: subnet and IPv6 prefix calculators, IP base conversion, DNS lookups, and User-Agent parsing.

• Subnet CalculatorWork out network, broadcast, host range and mask from any IPv4 CIDR.
• IP Base ConverterConvert an IPv4 address between dotted-decimal, integer, hex and binary.
• What Is My IPShow the IP address your connection presents to our server, IPv4 or IPv6.
• DNS LookupResolve A, AAAA, MX, TXT, NS and CNAME records for a domain.

Convert between text and wire formats: Base64 with URL-safe and Unicode support, URL percent-encoding, JSON string escapes, and text to binary or hex.

• Base64 Encode / DecodeEncode text to Base64 or decode it back, with URL-safe and Unicode support.
• URL Encode / DecodePercent-encode or decode text for use in URLs and query strings.
• JSON String Escape / UnescapeEscape text for a JSON string, or unescape a JSON string back to plain text.
• Text to Binary & Hex ConverterConvert text to binary, hex or decimal bytes, or decode bytes back to text.