About skefo

skefo is a compact, offline-friendly collection of 58 everyday tools for developers and security testers — hashing, encoding, token generation, network utilities and more.

Every tool runs entirely in your browser. No input is uploaded, logged or sent to any server, which makes it safe to paste sensitive values during an engagement.

A note on the crypto

SHA digests and HMAC use the browser's native Web Crypto API. MD5 is implemented in JavaScript for compatibility only — do not rely on MD5 or SHA-1 for security. The JWT decoder never verifies signatures, so treat decoded claims as untrusted.