Base64
URL
UUID
JWT decode
Regex
UUID v4
Header
Payload
Decodes only — signature is not verified (needs the secret/key).
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100% client-side · nothing uploaded · by Ajay Kakkar
About this tool
Free online developer tools — Base64 encode/decode, URL encode/decode, UUID v4 generator, JWT decoder (header & payload), and a live regex tester with match highlighting. 100% private, browser-based, no signup.
- Base64 encode/decode
- URL encode/decode
- UUID generator
- JWT decoder
- Regex tester