Converters
35 tools
Thirty-five converters, split between units, data formats and images. The measurement group converts length, weight, area, volume, speed, temperature and data size, and includes a general unit converter plus a px-to-rem converter for CSS work. The number group converts between bases, to and from binary, to Roman numerals and to written-out words, and a currency converter handles exchange rates. The data-format group holds four converters: JSON to XML and XML back to JSON, JSON to YAML, and CSV to JSON. The image group is the largest: resize, crop and compress, plus direct conversions between PNG, JPG, WebP, GIF and BMP in the combinations people actually search for. The image conversions run in your browser using the canvas API, so the picture you drop in is never uploaded to a server — which also means large files convert as fast as your own machine can handle them.
Tools
Unit Converter
Convert between different units of measurement for length, weight, volume, temperature, and more. All-in-one converter tool.
Binary Converter
Convert between binary, decimal, hexadecimal and octal in one place, with exact arbitrary-precision arithmetic, a bulk list mode and CSV export.
Roman Numerals Converter
Convert numbers to and from Roman numerals instantly. Learn the Roman numeral system with our free converter tool.
Temperature Converter
Convert one temperature into Celsius, Fahrenheit, Kelvin and Rankine at once, with the exact formula for each and a below-absolute-zero warning.
Image to Base64
Convert images to Base64 encoded strings for embedding in HTML, CSS, or JSON. Support for PNG, JPG, GIF, and more formats.
JSON to XML Converter
Convert JSON data into clean, formatted XML right in your browser, with a custom root element, array item name, and indentation.
Number to Words
Spell a number out in English words: cardinal, ordinal, or an amount of money in dollars, euros, pounds or yen, ready to copy onto a check.
PX to REM Converter
Convert pixels to rem units for responsive web design. Calculate rem values based on root font size. Free CSS unit converter.
Length Converter
Convert ten length units — mm, cm, m, km, µm, inch, foot, yard, mile and nautical mile — with exact factors, a bulk list mode and CSV export.
Weight Converter
Convert between weight units: kilograms, pounds, ounces, grams, and more. Free online weight and mass conversion calculator.
Data Size Converter
Convert bits, bytes and every prefix up to PB in either standard: binary steps of 1024 or decimal steps of 1000, with a full conversion table.
Currency Converter
Convert between world currencies with real-time exchange rates. Free currency calculator for over 150 currencies worldwide.
Speed Converter
Convert km/h, mph, m/s, ft/s, knots, Mach and more in one view, with exact factors, running pace and a batch mode that exports CSV.
Area Converter
Convert between area units instantly: square meters, feet, acres, hectares, and more. Free online area conversion calculator.
Volume Converter
Convert between volume units: liters, gallons, cups, milliliters, and more. Free online volume conversion calculator.
Text to Binary
Convert text to binary code and vice versa. Translate ASCII characters to binary representation for learning or encoding.
JSON to YAML Converter
Convert between JSON and YAML formats instantly. Bidirectional conversion with real-time preview.
CSV to JSON Converter
Convert CSV data to JSON format and vice versa. Supports auto-detection of delimiters, custom options, and multiple output formats.
XML to JSON Converter
Convert XML data to JSON format and vice versa. Handles attributes, nested elements, arrays, and CDATA sections.
Color Converter
Convert colors between HEX, RGB, HSL, HSV, and CMYK formats instantly. Pick any color and get all format values.
Number Base Converter
Convert numbers between binary, octal, decimal, hexadecimal, and any base from 2 to 36. Auto-detects prefixes like 0b, 0o, 0x.
Image Resizer
Resize, compress and convert images online. Supports JPEG, PNG, WebP. Adjust dimensions, quality and format — all processed in your browser.
Image Cropper
Crop images to any size or aspect ratio directly in your browser. Free, fast, and private.
Image Compressor
Compress and optimize images online. Reduce file size while maintaining quality. Supports JPEG, PNG, and WebP.
PNG to JPG Converter
Convert PNG images to JPG in your browser, with a quality slider, a measured size table and an exact target size in KB.
JPG to PNG Converter
Convert JPG images to PNG format online for free. Preserve quality and add transparency support. Fast and easy conversion.
WebP to PNG Converter
Convert WebP images to PNG format online for free. Preserve transparency and quality. No file size limits or watermarks.
WebP to JPG Converter
Convert WebP images to JPG format online for free. Maintain image quality while ensuring compatibility with all devices.
PNG to WebP Converter
Turn a PNG into a WebP in your browser, with a quality slider and transparency kept. The file is never uploaded.
JPG to WebP Converter
Convert JPG images to WebP format for smaller file sizes and faster loading. Maintain quality while reducing bandwidth usage.
GIF to PNG Converter
Convert a GIF to a lossless PNG in your browser, keeping the pixel size and the transparency. One still frame, no upload.
BMP to PNG Converter
Convert BMP images to PNG in your browser. Lossless, nothing uploaded, and the file usually ends up far smaller.
BMP to JPG Converter
Convert BMP images to JPG format online for free. Fast, easy, and no software installation required. Preserve image quality.
PNG to GIF Converter
Convert a PNG image to a single-frame GIF in your browser. Transparency is kept and the palette holds up to 256 colours.
Universal Image Converter
Convert images between PNG, JPG, WebP, GIF, and BMP formats online for free. Batch conversion with quality settings.