Topic

Security

Passwords, hashes, tokens and encoding.

Learn first

Practical Security: Passwords, Hashes & Tokens What makes a password strong (entropy, not weird symbols), what a hash is really for, and what a JWT says inside. ≈ 12 min read →

7 tools

Password Generator

Generate secure passwords and passphrases (with estimated entropy), 100% in your browser.

Hash / Checksum

Compute MD5, SHA-1, SHA-256/384/512 and CRC32 of text or files and compare against an expected value to verify integrity.

Entropy & Crack Time

Estimate the bit entropy of a password or policy and how long a brute-force attack would take at several cracking speeds.

JWT Decoder

Decode a JSON Web Token (Base64URL header and payload), show the algorithm and claims with human-readable dates, and flag if it is expired. 100% local.

Base64 / Hex / URL Encoder

Encode and decode text between Base64, Base64URL, Base32, hexadecimal, URL and HTML entities, in your browser.

Hash Identifier

Identify the likely algorithms of a hash by its length and format: MD5, SHA-1/256/512, CRC32, bcrypt, NTLM and more.

UUID / ULID Generator

Generate unique identifiers UUID v4 (random), UUID v7 (time-ordered) and ULID, with cryptographic randomness, in your browser.