SHA-1 Hash Generator
Drop any file, get its SHA-1 checksum. 100% private — runs entirely on your device via native WebCrypto.
Drop any file here
Computes SHA-1 hash — stays on your device
Why generate a SHA-1 hash?
- Verifying an ISO, installer, or binary against a publisher's published SHA-1.
- Comparing object fingerprints against a Git commit or blob ID.
- Detecting duplicate files across a large library by fingerprint.
- Confirming a backup or archive was restored without corruption.
- Producing a stable file fingerprint for a deployment pipeline's cache key.
- Cross-referencing a file against a SHA-1 threat-intelligence feed.
How our converter works
Your file is hashed using the browser's native WebCrypto API (crypto.subtle.digest with SHA-1) — the same implementation browsers use internally. The 160-bit hash (40 hex characters) is written in GNU coreutils format — <hash> <filename> — for direct verification with `sha1sum -c`. Nothing leaves your device.
Frequently asked questions
Is SHA-1 still safe to use?
For file integrity against accidental corruption, yes. For cryptographic security, no — Google demonstrated a practical SHA-1 collision in 2017. Git still uses SHA-1 for historical reasons but the industry has migrated to SHA-256 for new cryptographic uses.
How long is a SHA-1 hash?
160 bits, shown as 40 hexadecimal characters. Git uses the first 7 characters as its short commit hash.
Why does Git use SHA-1 if it's considered broken?
Git's use of SHA-1 is for content addressing, not cryptographic security — it's hashing you against your own accidental corruption, not a hostile attacker with infinite compute. The project is migrating to SHA-256 in its 'object-format' work, but backwards compatibility keeps SHA-1 in use.
What's the difference between SHA-1 and SHA-256?
SHA-1 produces 160-bit output; SHA-256 produces 256-bit output and is part of the SHA-2 family. SHA-256 has no known collision attacks and is the current standard for digital signatures, TLS certificates, and Bitcoin-style proof-of-work.
How do I verify my download against a published SHA-1?
The output is in md5sum-style format (`<hash> <filename>`). Put both files in the same directory and run `sha1sum -c filename.sha1` on Linux/macOS, or use `certutil -hashfile filename SHA1` on Windows and compare by eye.
Does the hash generator work offline?
Yes — WebCrypto is built into your browser, no library download required. Once the page loads you can disconnect and it still works.