QR codes for links, text, Wi-Fi, email, phone and contact cards — as PNG and SVG.
MD5, SHA-1/2/3, BLAKE2 and CRC32 of text or files, with checksum verification.
Sign a message with HMAC (SHA-256, SHA-512…), as hex and Base64 — handy for webhook signatures.
Cryptographically random passwords, diceware-style passphrases and PINs, with entropy.
UUID v4, time-ordered UUID v7, ULID, Nano ID, hex tokens and name-based UUID v5.
Fibonacci ToolBox runs its tools from your browser session and needs JavaScript.