Security Tools

Store and manage 2FA backup codes securely in your browser. Encrypt codes with a master password using the Web Crypto API (AES-GCM). View, reveal, and mark codes as used. All data encrypted and stored in localStorage.

Generate secure numeric PINs of configurable length (4-12 digits). Avoid sequential numbers, repeated digits, and hundreds of common weak patterns (1234, 0000, birthdays, keyboard patterns). Generate multiple PINs at once with strength analysis, copy individual or all PINs, and download as text. All processing runs locally in your browser - no signup required.

Write encrypted notes that are AES-256-GCM encrypted in your browser before being stored. Set a passphrase to encrypt and decrypt notes. Notes are stored as encrypted ciphertext in localStorage. All encryption and decryption happens locally using the Web Crypto API - no signup required, nothing sent anywhere.

Check password strength in real-time as you type with character analysis, Shannon entropy calculation (bits), and estimated time-to-crack at 1 billion guesses per second. Visual strength bar (Very Weak to Very Strong) with a 0-100 score. Requirements checklist tracks 7 criteria. Character breakdown by uppercase, lowercase, digits, and symbols. Includes a secure password generator (8-64 chars) with customisable character sets using crypto.getRandomValues(). All processing runs locally in your browser - free online Password Strength Meter, no signup required.

Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes for any text or file. Compare two hashes for equality. All via Web Crypto API, local-only. Free online Hash Generator & Comparator, no signup required.