Developer Toolkit

The everyday dev utilities — UUIDs, hashes, JSON formatting, Base64, URL & HTML encoding, JWT decode, timestamps, number bases, regex testing and a device-size mobile view tester.

• UUID generatorGenerate cryptographically-random version-4 UUIDs — one or many at once, with options for uppercase, no…
• Hash generatorType or paste text and get its MD5, SHA-1, SHA-256, SHA-384 and SHA-512 digests, live. SHA hashes use your…
• JSON formatter & validatorPaste JSON and pretty-print it with the indent you choose, minify it to a single line, or validate it with a…
• Base64 encoder / decoderEncode text to Base64 or decode it back — UTF-8 safe, two-way live, fully offline in your browser.
• URL encoder / decoderPercent-encode text for safe use in URLs, or decode it back. Switch between encoding a whole URL and encoding…
• HTML entity encoder / decoderEscape text into HTML entities so it shows literally in a page (and can’t break your markup), or decode…
• JWT decoderPaste a JSON Web Token and see its decoded header and payload, with the standard time claims (exp, iat, nbf)…
• Unix timestamp converterTurn a Unix/epoch timestamp into a human date — local time, UTC, ISO 8601 and a relative “x ago” — or turn a…
• Number base converterConvert a whole number between binary, octal, decimal, hexadecimal and any base from 2 to 36 — with arbitrary…
• Regex testerTest a regular expression against sample text with live match highlighting, capture groups, flag toggles and…
• Mobile view testerSee how a page looks on a phone, tablet, laptop and desktop at once — real device widths, rotate, zoom to…