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Developer Tools

Format, encode, test and generate — the daily dev toolbelt.

Code Formatter & Beautifier

Beautify and format JSON, HTML, CSS, JavaScript, TypeScript and more with one click. A free code formatter; your code is never sent to a server.

Encoder / Decoder

Encode and decode Base64 for text or files, decode JWT tokens to read their claims, and generate hashes and UUIDs. Free, instant, nothing leaves your browser.

Hash Generator

Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from text or files to verify downloads and checksums. Free, computed in your browser.

Regex Tester

Test regular expressions against sample text with live match highlighting, groups and flags. A free regex tester; nothing is uploaded.

Number Base Converter

Convert numbers between binary, octal, decimal, hexadecimal and Roman numerals, with step-by-step results. Free and instant, no signup.

Cron Expression Generator

Build a cron expression field by field with a visual editor and plain-English presets, then copy it. A free cron generator for developers.

UUID Generator

Generate one or thousands of UUIDs (v1, v4 and v7) in bulk, ready to copy or download, with v4 using your browser's secure randomness. Free and instant.

HTML Preview

Write HTML, CSS and JavaScript and see it render live in a sandboxed frame. A free online playground that runs entirely in your browser.

The utilities that otherwise live in a dozen browser tabs: beautify a JSON blob from a log, decode a JWT to see its claims, check a hash, try a regex against sample input, work out what a cron expression actually means.

Nothing you paste is sent to a server, which is the point when the input is a token, a config file or production data.