What is SHA1 Hash Generator?

Our SHA1 Hash Generator computes the SHA-1 digest of any text you enter — a 160-bit hash rendered as a 40-character hexadecimal string. SHA-1 sits between MD5 and SHA-256: longer and more distinctive than MD5's digest, but like MD5 it is cryptographically broken.

Today its legitimate use is legacy compatibility and non-security fingerprinting — Git still exposes SHA-1 object IDs for commits and trees, and many older download pages publish SHA-1 checksums alongside SHA-256.

How to use

1. Paste or type the text you want to hash into the input field — a commit message, a configuration snippet, or any string.
2. The SHA-1 computation happens automatically as you type, with no generate button to click.
3. The 40-character lowercase hexadecimal digest appears below the input.
4. Copy the digest with the copy button to verify a downloaded file against a published SHA-1 checksum or to cross-check a Git object ID.

Common use cases

• Git object identification: a developer who only remembers a commit's message can paste it here to experiment with hashing, while actual Git workflows expose SHA-1 (40-hex) IDs for every commit, blob, and tree.
• Legacy download verification: older software mirrors publish SHA-1 checksums of their archives; hashing your downloaded copy here lets you confirm it matches the mirror's published value.
• Duplicate content spotting: an SEO analyst hashes article bodies to detect near-identical scraped copies across sites without keeping full copies of every page.
• System migration work: when moving off a legacy platform that stored SHA-1 references (old certificate logs, archival catalogs), engineers need a quick generator to produce matching-format digests.

FAQs

Is SHA-1 still secure?

No. Google's SHAttered project demonstrated a practical SHA-1 collision in 2017, and chosen-prefix collisions have only gotten cheaper since. Browsers and certificate authorities retired SHA-1 years ago. Use it for checksums and legacy lookups, never for passwords or signatures.

How is SHA-1 different from MD5 and SHA-256?

The difference is digest size and security status. MD5 produces a 128-bit digest (32 hex characters) and is the weakest; SHA-1 produces 160 bits (40 hex characters) and is also broken, though it survived longer; SHA-256 produces 256 bits (64 hex characters) and remains secure. When you have a choice, prefer SHA-256.

Can two different texts produce the same SHA-1 hash?

In theory yes — real SHA-1 collisions have been publicly demonstrated. In practice, accidental collisions between normal texts remain astronomically unlikely; the known attacks need deliberate, expensive construction. For casual integrity checks it is still adequate.

Is my input stored or sent anywhere?

No. The digest is calculated locally inside your browser the instant you type, using no server round-trip. There is no account, no signup, and no logging — what you paste never leaves your machine.