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JWT Signature Verifier

Verify a JWT signature against an explicitly selected algorithm and trusted key.

Mode

Input

99 chars1 lines

Result

Type or paste on the left — the result updates as you type.

Supports HS/RS/PS/ES 256, 384 and 512. HMAC uses UTF-8 secrets; RSA/EC use SPKI public PEM. Signature verification does not validate claims or trust the key.

Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.

Format references

Tool page updated: