💡SHA-1 has known collisions; avoid for new security designs.
This tool runs entirely in your browser. Your content is never uploaded—100% private and secure.
What is SHA‑1?
SHA‑1 (Secure Hash Algorithm 1) outputs a 160‑bit digest. It was widely used for signatures and integrity but now has practical collision attacks (chosen-prefix collisions demonstrated). Modern security protocols have migrated to SHA‑256 or stronger.
Legacy / Security Notes
Only use SHA‑1 where you must interoperate with legacy systems and a collision would have low impact. Do not use for new signatures, certificate chains, or commit integrity; choose SHA‑256/512 or SHA‑3/BLAKE3 families depending on requirements.
SHA-1 hash generator online legacy (free, no upload)
FAQs
Is SHA-1 broken?
Practical chosen-prefix collisions exist. Avoid for new security designs.
Migration path?
Move to SHA-256/512 or SHA-3 depending on requirements and ecosystem support.
Does this tool upload my data?
No. Hashing is performed entirely in your browser.