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Numio

JWT Generator and Signer

Create signed JWTs with HMAC, RSA, RSA-PSS or ECDSA using browser Web Crypto.

Mode

Input

60 chars1 lines

Result

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

Supports HS/RS/PS/ES 256, 384 and 512. HS256/384/512 need at least 32/48/64 UTF-8 key bytes; RSA keys need 2048 bits. PEM uses PKCS#8 private keys.

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: