Hash Generator
Generate cryptographic hashes (SHA-1, SHA-256, SHA-512) from any text, entirely in your browser.
Cryptographic hash functions produce a fixed-length fingerprint from any input. The same input always produces the same hash. Any change to the input, even a single character, produces a completely different hash. This makes hashes useful for verifying file integrity, storing passwords (with proper salting), and generating checksums. SHA-256 and SHA-512 are cryptographically secure. SHA-1 is considered weak for security purposes but is still used for checksums. MD5 is broken for security use and is omitted here.
This tool runs entirely in your browser using the Web Crypto API. Your text is never sent to any server.
Frequently asked questions
Can I reverse a hash back to the original text?
No. Hash functions are one-way. There is no algorithm to reverse a SHA-256 hash back to its input. Attackers use precomputed rainbow tables or brute force to crack hashes of common passwords, which is why password hashing must use a slow algorithm like bcrypt or Argon2 with a unique salt per password.