Developer tools
Format, convert and debug data formats used every day.
Developer
JSON Formatter & Validator
Format, validate, beautify and minify JSON online. Free browser-based JSON formatter with error detection and no signup.
Developer
Regex Tester
Test regular expressions online with live match highlighting, capture groups and replacement preview. Free, private, runs in your browser.
Developer
Base64 Encoder & Decoder
Encode and decode Base64 online — UTF-8 safe text plus file to Base64 and Base64 to file. Free, private, runs in your browser.
Developer
URL Encoder & Decoder
Encode and decode URLs and components online, and parse query strings. Free percent-encoding tool that runs in your browser.
Developer
Unix Timestamp Converter
Convert Unix timestamps (seconds or milliseconds) to local, UTC and ISO 8601 dates, and back. Free epoch converter — runs locally.
Developer
UUID Generator & Validator
Generate UUID v4 in bulk and validate UUIDs online. Free GUID generator that runs entirely in your browser.
Developer
Markdown Editor & Previewer
Write Markdown with a live split preview: headings, tables, code and task lists. Copy or export to HTML. Free online editor.
Developer
JWT Decoder
Decode JWT header and payload online with readable timestamps and standard claims. Decoding is not verification. Free, runs locally.