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7 tools

Developer tools

Free developer tools that run in your browser: JSON formatter, Base64 and URL encoders, JWT decoder, hash and UUID generators, and a regex tester.

01
JSON FormatterFree JSON formatter and validator: beautify, minify and fix errors fast.
02
Base64 Encoder / DecoderBase64 encode or decode text online with UTF-8 and URL-safe support.
03
URL Encoder / DecoderURL encoder and decoder for query strings, paths and full URLs, in one click.
04
JWT DecoderJWT decoder: view header, payload and claims and check expiry in your browser.
05
UUID GeneratorUUID generator for random v4 UUIDs and GUIDs, one at a time or 1000 in bulk.
06
Hash GeneratorHash generator for MD5, SHA-1, SHA-256, SHA-384 and SHA-512 digests of text.
07
Regex TesterRegex tester with live highlighting, capture groups and flags for JavaScript.

About these developer tools

These developer tools cover the small, repetitive jobs that interrupt real work: making a minified API response readable, checking whether a token has expired, turning a string into Base64 for a header, or confirming that a regular expression matches the lines you expect. Each one opens instantly, needs no account, and processes your input with standard browser APIs such as JSON.parse, TextEncoder, crypto.subtle and RegExp.

Nothing you paste is uploaded. That matters for developers because the inputs are often production tokens, customer records or internal URLs. You can open any of these pages, disconnect from the network, and keep working. Every tool also explains its edge cases in a short FAQ, so you can check a detail like Base64 padding or JWT clock skew without leaving the page.