Tool · client-side · no signup

PKCE Code Generator.

Generate a cryptographically-strong PKCE code_verifier + code_challenge pair (S256). Useful for testing OAuth 2.1 + Authorization Code flows in CI, Postman, curl. Done client-side via WebCrypto.

Verifier lengthRFC 7636: 43–128 chars

PKCE pair appears here

Click Generate. The verifier + challenge are derived locally via WebCrypto.

What this is good for

Typical use cases.

Test an OAuth 2.1 / Authorization Code + PKCE flow in Postman
Generate verifiers for an integration test suite
Sanity-check that your PKCE library produces the same challenge for a given verifier

See the flow

PKCE Generator pairs with these.

OAuth 2.1 explainedOAuth Flow Visualizer