Free Hash Generator Tool Online
Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes from text instantly, using your browser's built-in Web Crypto API.
IN: Text · OUT: SHA hash digests · RUNS: 100% in your browser
MD5 isn't offered here since it's cryptographically broken — SHA-256 or SHA-512 are the safer choice for integrity checks and fingerprints.
Frequently asked questions
Why isn't MD5 included?+
MD5 has well-documented cryptographic weaknesses (collision attacks) and is no longer considered secure for integrity or security purposes. We only offer the SHA-2 family plus SHA-1, and recommend SHA-256 or SHA-512 for any real use case.
Is SHA-1 still safe to use?+
SHA-1 is included for compatibility with legacy systems that still require it, but it's also considered cryptographically weak for security-sensitive purposes. Prefer SHA-256 or higher for new projects.
What's the difference between SHA-256 and SHA-512?+
SHA-512 produces a longer digest (64 bytes vs 32 bytes for SHA-256) and is generally faster on 64-bit hardware. Both are currently considered cryptographically secure; the choice often comes down to convention within a given system.
What can I use these hashes for?+
Common uses include verifying file integrity (comparing a downloaded file's hash to a published one), generating deterministic fingerprints for data, and non-reversible checksums — but not for hashing passwords, which needs a dedicated algorithm like bcrypt or Argon2 with salting.
Is my input text sent to a server to compute the hash?+
No, hashing runs entirely in your browser using the native Web Crypto SubtleCrypto API, the same cryptographic implementation built into the browser itself.
Why does the hash change even for a tiny change in input?+
This is the 'avalanche effect', a core property of cryptographic hash functions: even a one-character change in input produces a completely different, unpredictable output hash.