Tools

Caesar, ROT13, Atbash, and Vigenère transforms plus letter-frequency analysis for CTF and puzzle solving.

Decode a PKCS#10 Certificate Signing Request (CSR) to verify its subject, public-key algorithm, and signature before you submit it to a CA.

Shannon entropy and character-class analysis for a secret.

Compute MD5, SHA-1, SHA-256, and SHA-512 digests of any text in one pass, entirely in your browser.

Identify likely hash algorithms from a digest by its length, character set, and prefix format.

Generate keyed HMAC signatures (HMAC-SHA1, HMAC-SHA256, HMAC-SHA512) for API signing and webhook verification.

Generate strong, cryptographically-random passwords with configurable length and character sets — computed in your browser and never transmitted.

Measure password entropy, character-class coverage, and estimated brute-force crack time — all offline.

Paste a PEM/DER X.509 certificate to decode its subject, issuer, validity dates, serial, public-key and signature algorithms, and Subject Alternative Names.

Generate cryptographically-random v4 (or time-based v1) UUIDs in bulk, and decode any UUID to reveal its version, variant, and embedded timestamp.

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes.