Free online Security tools

Passwords, hashes, 2FA and ciphers using browser cryptography.

6 tools

Caesar and Vigenère cipherEncode messages with Julius Caesar’s cipher, ROT13, ROT47 or Vigenère, and decrypt texts even without the key: we try all 25 shifts and rank the results by how closely each one resembles real text in your language.

Hash generator (MD5, SHA-256, CRC32…)Get the most common hashes of a text or a file at once and compare them with the checksum published by the author to make sure a download is neither corrupted nor tampered with. Files are processed in a Web Worker without uploading them anywhere.

Passphrase generatorA passphrase combines several randomly chosen words, like “Harbor-Tiger-Rain-Map-Cheese42”. It can be as secure as a long password and is far easier to remember and type. Words are picked with your browser’s cryptographic generator.

Strong password generatorGenerate truly random passwords with your browser’s cryptographic generator, unbiased and without them ever leaving your device. Adjust length and character types and instantly see their entropy and how long an attacker would need to guess them.

Password strength checkerIt goes beyond counting uppercase letters and symbols: it detects the patterns attackers use — common words, substitutions like @ for a, keyboard sequences, repetitions and dates — and calculates the effective entropy and time to crack in four real-world scenarios.

TOTP code generator (2FA)Get the same time-based codes your authenticator app shows from its secret key, or create a new secret with its QR code to implement two-step verification in your own application. Fully RFC 6238 compliant.