Base64url encode/decode
ClientAuto-detect: URL-safe alphabet decodes; plain text encodes.
URL-safe Base64 without padding—JWT segment helper in browser.
About Base64url encode/decode
URL-safe Base64 without padding—JWT segment helper in browser. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.
How to use this page
Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.
Invalid base64url.
Common use cases
- Base64url encode/decode for quick local checks without uploading data.
- Copy results into tickets, docs, or classroom notes.
Common mistakes to avoid
Unexpected input shape
See the intro and how-to notes for accepted formats.
FAQ
Is processing local?
Yes—this runs entirely in your browser.
Agent prefill?
Use q or qb for the main text field when supported.
More tools
Related utilities you can open in another tab—mostly client-side.
Encoding tools
ClientHub index: Base64 & URL, Base64url, Base32, Crockford, LEB128, ASCII85, Z85, Base58, base-36, bencode, Morse, quoted-printable, URI, Punycode/IDN, Unicode escapes, data URLs, MIME, hex, HTML entities, JWT, JSON helpers, crypto.
JWT decode
ClientInspect JWT header and payload as JSON in browser; signature not verified.
Hash identifier
ClientGuess digest type from hex length, Base64 shape, or bcrypt/Argon2 prefixes—heuristic, local only.
Hex encode & decode
ClientUTF-8 text to hex and hex to text—strip spaces, local only.