Free Hash Generator Online
Generate SHA-256, SHA-1, and SHA-512 cryptographic hashes from any text input. Uses the browser's built-in Web Crypto API — nothing leaves your device.
A cryptographic hash function takes any input and produces a fixed-length output — the hash or digest — that is unique to that input. Change one character in the input and the entire hash changes. Hashes are used to verify data integrity (confirming a downloaded file has not been tampered with), to store passwords safely (by hashing before saving), and to produce fingerprints for content addressing. This tool generates SHA-256, SHA-1, and SHA-512 hashes using your browser's built-in Web Crypto API. The input never leaves your device, so you can safely hash sensitive strings to inspect what a stored hash should look like.
Hash Generator
How to use this hash generator
- Type or paste the text you want to hash into the input area.
- Select the algorithm: SHA-256 for most uses, SHA-512 for higher security, SHA-1 for legacy compatibility checking.
- Click Generate to compute the hash. The output is a hexadecimal string.
- Click Copy to put the hash on your clipboard.
Common use cases
- Verifying that a downloaded file has not been modified by comparing its SHA-256 hash to the official checksum
- Generating the expected hash of a value to compare to what is stored in a database during debugging
- Producing a content fingerprint for cache busting — the hash changes only when the content changes
- Checking that two strings are identical without directly comparing their contents
- Learning how small input changes produce completely different hashes (the avalanche effect)
Frequently asked questions
Can I reverse a hash to get the original input?
No. Cryptographic hash functions are one-way by design. There is no mathematical operation that recovers the input from the hash. Attackers recover passwords from hashes using precomputed tables or brute force — which is why password hashes should use bcrypt, scrypt, or Argon2, not raw SHA.
Which algorithm should I use?
SHA-256 is the right choice for most uses: file integrity checking, HMAC signatures, content fingerprinting. SHA-1 is cryptographically broken for collision resistance and should only be used for legacy compatibility, not new security-sensitive work.
Is this safe to use for password hashing in production?
No. Raw SHA hashes should not be used for password storage. SHA is too fast — an attacker can compute billions per second. Use bcrypt, scrypt, or Argon2, which are intentionally slow and include built-in salting.
What is a hash collision?
A collision is when two different inputs produce the same hash output. The security of a hash function depends on how hard it is to find a collision intentionally. SHA-1 has known collision attacks; SHA-256 and SHA-512 are considered collision-resistant.