Free Online Security Tools
Generate secure passwords, create cryptographic hashes, and audit password strength — entirely in your browser with no data uploads.
Free online security tools make cryptographic operations accessible without requiring a local development environment or trusting a third-party server with sensitive data. Every tool in this collection runs entirely client-side in your browser.
The Password Generator uses the Web Crypto API to produce cryptographically secure random passwords with customizable length, character sets (uppercase, lowercase, numbers, symbols), and optional pronounceability. It generates passwords that meet the strictest enterprise security policies while remaining memorable when required.
The Password Strength Checker analyses passwords in real time against multiple criteria: length, character diversity, common password lists, and entropy estimation. It provides actionable feedback explaining exactly what makes a password weak and how to fix it.
The MD5 Hash Generator, SHA-256 Hash Generator, and SHA-512 Hash Generator produce cryptographic hash digests from any text input. Use them to verify file integrity, generate checksums, or create hash values for comparison — standard research, testing, and security audit workflows that previously required a terminal or local script. The HMAC Generator goes a step further, producing keyed message authentication codes for signing webhooks and verifying API requests.
The line now covers real cryptography rather than hashing alone. AES Text Encryption protects a message with AES-256-GCM and a passphrase, detecting tampering as well as concealing content. The bcrypt Generator produces and verifies password hashes with a configurable cost factor, and the htpasswd Generator turns those into an Apache or Nginx basic-auth file. The TOTP Generator computes 2FA codes from a Base32 secret for testing and recovery, the RSA and EC Key Pair Generator creates PEM and JWK keys using your own machine's randomness, and the JWT Signer mints test tokens to pair with the existing decoder. A File Checksum Verifier hashes a download and compares it against a published value, while SHA-1 and CRC32 are provided for legacy systems with an explicit warning that neither is a security function.
For anyone who has to actually remember the credential, the Passphrase Generator builds long diceware-style phrases from random words — far easier to type and recall than a symbol soup, and stronger than most short passwords because length dominates entropy.
All tools process data locally. No password, hash input, or security-sensitive string is ever transmitted over the network.