Free SHA-1 Hash Generator
Generate SHA-1 digests instantly — for text or whole files. The 40-character hash updates live as you type, or drop a file in to checksum its bytes locally without uploading anything.
SHA-1 digest
—
How to Use the SHA1 Generator
- Type or paste text — the SHA-1 hash computes live.
- Or drop a file into the file box to hash it locally.
- Toggle uppercase for upper-case hex output.
- Click Copy to grab the digest.
Features
Text mode hashes live with debouncing for smooth typing; file mode streams the file through the FileReader API and hashes bytes in the browser — nothing is uploaded. The 160-bit digest displays in lowercase hex with an uppercase toggle and one-click copy.
Benefits & Use Cases
Developers verify legacy checksums still published as SHA-1; teams generate deterministic IDs for caches and deduplication; anyone comparing document versions gets a quick fingerprint. Local file hashing keeps confidential files private.
Tips
SHA-1 is collision-broken — fine for checksums and identifiers, never for security decisions or passwords. For new integrity needs, prefer SHA-256.
Frequently Asked Questions
What is SHA-1?
SHA-1 is a cryptographic hash function producing a 160-bit digest (40 hex characters). It was once the standard for checksums and certificates but is now considered broken for security use.
Is SHA-1 secure?
No — practical collision attacks exist, meaning two different inputs can share a hash. Do not use SHA-1 for signatures, certificates, or password storage. It remains acceptable for non-security checksums and identifiers.
SHA-1 vs MD5 — which is better?
SHA-1 is marginally stronger than MD5, but both are broken for security. For any new work requiring collision resistance, use SHA-256 or SHA-512.
Can I reverse a SHA-1 hash?
No. Like all cryptographic hashes, SHA-1 is one-way — though short or common inputs can be brute-forced or found in lookup tables.
Is my file uploaded when I hash it?
No. Files are read and hashed entirely in your browser — their contents never leave your device.
Related Tools
Hash Generator
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes at once with NToolHub’s free tool. Compare algorithms side by side — private in-browser hashing.
Open tool →MD5 Generator
Generate MD5 hashes instantly with NToolHub’s free tool. Live hashing as you type, uppercase option, file checksum mode — private.
Open tool →SHA256 Generator
Generate SHA-256 hashes instantly with NToolHub’s free tool. Live text hashing, local file checksums — secure, fast, 100% private.
Open tool →SHA512 Generator
Generate SHA-512 hashes instantly with NToolHub’s free tool. 128-char digests, live hashing, file checksums — 100% private in-browser.
Open tool →Password Hash Generator
Hash passwords securely with NToolHub’s free tool. Bcrypt plus salted SHA options, random salt, verifier — 100% private in-browser.
Open tool →