Turn text into Base64 or decode it back. Your data never leaves this computer.
Only the contents of the JWT are read. The signature is not verified, so this tool does not prove that a token is genuine.
Enter Unix seconds or milliseconds, ISO 8601, or a date like "2026-09-30 14:30".
Type text or choose a file. SHA-1, SHA-256, SHA-384 and SHA-512 are computed. The file never leaves your computer.
Yes. Text is handled as UTF-8, so letters like ş, ğ, é and emoji work fine.
It uses - and _ instead of + and / from standard Base64 and drops the trailing =. It is used for JWTs and data carried in URLs.
No. Base64 is only an encoding and anyone can decode it. Do not use it to protect secret data.