Generate as many random UUIDs as you need and copy them. Nothing is sent to a server.
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, it uses your browser's secure random number generator.
In practice no. The chance of two v4 UUIDs being equal is negligible.
Yes, GUID is the name Microsoft uses. The format is the same.