Your data never leaves this computer. Everything runs in your browser, nothing is uploaded.
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.