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

1. Open Calculate SHA-1 Hash.
2. Paste or type your text.
3. 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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