Hash Generator (SHA, MD5)
The Hash Generator is a free online tool that computes hash digests of text using MD5, SHA-1, SHA-256, SHA-384, and SHA-512 algorithms. All hashing is performed locally in your browser using the Web Crypto API — no data is ever sent to a server.
Features real-time hashing as you type, uppercase/lowercase toggle, copy-to-clipboard, and a compare mode to verify hashes against expected values. Security warnings are shown for MD5 and SHA-1 which are no longer recommended for cryptographic use.
How it works
A cryptographic hash function maps input data of arbitrary size to a fixed-size output (digest). SHA-256 produces a 256-bit (64 hex character) digest. MD5 produces a 128-bit (32 hex character) digest. The same input always produces the same hash, but even a tiny change in input produces a completely different output.
Use cases
- Verifying file integrity by comparing checksums
- Checking data hasn't been tampered with during transfer
- Generating unique identifiers from content
- Comparing passwords or tokens without exposing the original value
- Validating download integrity using SHA-256 checksums