How to use it
A hash (digest) turns any text into a fixed-length fingerprint. The same input always gives the same output, but you cannot reverse it back to the text. Useful for checksums, deduplication and verifying integrity. SHA-1 is included for legacy use, but it is cryptographically weak — prefer SHA-256 or SHA-512.
Example
Input
abc → SHA-256 Result
ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad Frequently asked questions
Can I reverse a hash back to the text?
No. Hashing is one-way by design — many inputs map to a fixed-length output, so the original text cannot be recovered. To check a value you re-hash it and compare.
Is SHA-1 still safe to use?
Not for security. Practical collisions exist, so avoid SHA-1 for signatures or passwords. It is fine for non-security checksums or matching legacy systems. Prefer SHA-256 or SHA-512.
Is my text sent anywhere?
No. Hashing runs entirely in your browser via the Web Crypto API; nothing is uploaded.