The complete catalogue
All tools
54 free tools, organized by category. Use the search to find what you need.
54 of 54 tools match.
Converters
Length ConverterConvert between meters, kilometers, miles, feet, inches, yards, and more — instantly and accurately.Weight ConverterConvert kilograms, grams, pounds, ounces, stones, and metric tons with exact conversion factors.Temperature ConverterConvert between Celsius, Fahrenheit, and Kelvin instantly with the standard formulas.Data Size ConverterConvert bits, bytes, KB, MB, GB, TB — including binary units KiB, MiB, GiB — with both 1000 and 1024 factors.Speed ConverterConvert km/h, mph, m/s, knots, and ft/s instantly — handy for driving, aviation, and sports.Area ConverterConvert square meters, square feet, acres, hectares, and more for real estate, land, and construction.Volume ConverterConvert liters, gallons, cups, milliliters, fluid ounces, and more — perfect for cooking and chemistry.Time Unit ConverterConvert milliseconds, seconds, minutes, hours, days, weeks, months, and years.Number Base ConverterConvert numbers between binary, octal, decimal, and hexadecimal — supports arbitrarily large integers.Roman Numeral ConverterConvert numbers to Roman numerals and back — supports values from 1 to 3999 with instant validation.Number to Words ConverterSpell out any number in English words — plain text, US dollar amounts, or check-writing format.ISBN Validator & ConverterValidate any ISBN's check digit and convert between ISBN-10 and ISBN-13 formats instantly.VIN DecoderDecode a 17-character VIN: validate the check digit, find the model year, country, and manufacturer — free.Unix Timestamp ConverterConvert Unix timestamps to human-readable dates and back. Supports seconds and milliseconds, UTC and local time.
Calculators
Percentage CalculatorCalculate percentages three ways: X% of Y, what percent X is of Y, and percentage increase or decrease.BMI CalculatorCalculate your Body Mass Index in metric or imperial units and see the WHO weight category it falls into.Loan CalculatorCalculate your monthly loan payment, total interest, and total cost from the amount, rate, and term.Compound Interest CalculatorSee how savings grow with compound interest: initial deposit, monthly contributions, rate, and time.Tip CalculatorCalculate the tip and split the bill between any number of people — with quick percentage presets.Discount CalculatorCalculate the sale price after a percentage discount and see exactly how much you save.Age CalculatorCalculate exact age in years, months, and days from a date of birth — plus a countdown to the next birthday.Date Difference CalculatorCount the days, weeks, months, and years between two dates — including or excluding the end date.
Generators
QR Code GeneratorCreate free QR codes for URLs, text, Wi-Fi, and more. Customize size and colors, then download as PNG.Password GeneratorGenerate strong, random passwords with custom length and character sets — created locally, never transmitted.UUID GeneratorGenerate random UUIDs (v4) and time-ordered UUIDs (v7) in bulk. Copy one or all with a click.Hash GeneratorCompute MD5, SHA-1, SHA-256, and SHA-512 hashes of any text instantly in your browser.Lorem Ipsum GeneratorGenerate lorem ipsum placeholder text by paragraphs, sentences, or words for your designs and mockups.Random Number GeneratorGenerate random numbers in any range — single picks, multiple values, unique draws, dice, and lottery style.Barcode GeneratorCreate CODE128, EAN-13, UPC, and other barcodes online and download them as PNG or SVG.Slug GeneratorConvert any title or phrase into a clean, SEO-friendly URL slug — lowercase, hyphenated, accent-free.
Text Tools
Word CounterCount words, characters, sentences, and paragraphs in real time — with reading and speaking time estimates.Case ConverterConvert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case, and more.Remove Duplicate LinesDelete duplicate lines from any list or text — with options to trim whitespace and ignore case.Sort LinesSort lines of text alphabetically, numerically, naturally, in reverse — or shuffle them randomly.Text Diff CheckerCompare two texts side by side and see added, removed, and unchanged lines highlighted instantly.Markdown PreviewWrite Markdown and see the rendered result live — headings, lists, tables, code blocks, and links.
Developer Tools
Base64 Encoder / DecoderEncode text to Base64 or decode Base64 back to text — full Unicode support, plus URL-safe variant.URL Encoder / DecoderPercent-encode text for safe use in URLs, or decode %20 and friends back to readable text.HTML Entity Encoder / DecoderEscape special characters to HTML entities (&, <, ") or decode entities back to plain text.JSON Formatter & ValidatorFormat, validate, and minify JSON with syntax-error messages, custom indentation, and key sorting.JSON ⇄ YAML ConverterConvert JSON to YAML and YAML to JSON instantly — ideal for Kubernetes, CI configs, and OpenAPI specs.CSV ⇄ JSON ConverterConvert CSV data to a JSON array of objects and back — with delimiter auto-detection and header support.SQL FormatterBeautify SQL queries with proper indentation and keyword casing — supports PostgreSQL, MySQL, T-SQL, and more.JWT DecoderDecode a JSON Web Token to inspect its header and payload — with human-readable expiry timestamps.Regex TesterTest regular expressions against sample text with live match highlighting and capture-group details.Cron Expression ParserTranslate cron expressions into plain English and understand each of the five fields at a glance.Chmod CalculatorConvert Unix file permissions between checkbox, octal (755), and symbolic (rwxr-xr-x) notation.IP Subnet CalculatorCalculate network address, broadcast, host range, and usable host count from an IPv4 address and CIDR prefix.
Design Tools
Color ConverterConvert colors between HEX, RGB, and HSL with a live preview and WCAG contrast check against black and white.CSS Gradient GeneratorDesign linear and radial CSS gradients visually and copy the generated CSS with one click.Box Shadow GeneratorCraft CSS box shadows visually — offset, blur, spread, color, opacity, inset — and copy the code.
Image Tools
Image CompressorCompress and resize JPEG, PNG, and WebP images in your browser — no upload, no quality guesswork.EXIF RemoverSee the hidden metadata in your photos — camera, date, GPS location — and download a clean copy without it.Favicon GeneratorTurn any logo into a complete favicon set: favicon.ico, Apple touch icon, and PWA icons with ready HTML.