Calculate SHA-1 Hash – Free Online SHA1 Hash Generator
Compute SHA-1 hash from text in your browser. Client-side only. Use for Git, checksums, and legacy systems; prefer SHA-256 for security.
What is the SHA-1 Hash tool?
This tool computes the SHA-1 hash of any text. SHA-1 is a 160-bit hash. It is deprecated for security but still used for Git commits, checksums, and legacy APIs. All hashing runs in your browser.
Key features
- Client-side — No server uploads.
- UTF-8 input — Any text. Empty input gives the SHA-1 of the empty string.
- Instant — Hash updates as you type.
- Copy — One-click copy.
How to use
- Open Calculate SHA-1 Hash.
- Paste or type your text.
- Copy the SHA-1 hash.
When to use SHA-1
- Git — Commit IDs use SHA-1.
- Legacy APIs or checksums that require SHA-1. For new security use, prefer SHA-256 or SHA-512.
Limitations
SHA-1 has known collisions. Do not use for passwords or signatures. Use SHA-256 or SHA-512 for security.
Frequently asked questions
What is SHA-1 used for?
SHA-1 is a 160-bit hash. It is deprecated for security but still used for checksums, Git commits, and legacy systems.
What input does the tool accept?
Any text. Input is hashed as UTF-8.
Is SHA-1 secure?
No. SHA-1 has known collisions. Use SHA-256 or SHA-512 for security. SHA-1 is fine for non-security checksums.
Is my data sent to a server?
No. Hashing runs in your browser. Your text never leaves your device.
When should I use SHA-1?
For Git compatibility, legacy APIs, or checksums where collision resistance is not critical. Prefer SHA-256 for new work.
Why does my hash not match?
Ensure identical input and UTF-8 encoding. Spaces and newlines affect the hash.
Try the tool
Use Calculate SHA-1 Hash. See Hash Generator, SHA-256, or All Hashes.
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