SHA1 Hash
Calculate the SHA-1 hash of any text or file, entirely inside your browser tab using the native Web Crypto API.
🔒 Files are processed locally in your browser whenever possible — nothing is uploaded to our servers.
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About this tool
Calculates the SHA-1 hash of text you type or paste, or of a file you upload, using the browser's native Web Crypto API.
How to use it
- Choose Text or File input.
- Type/paste text, or upload a file.
- Click Calculate SHA-1, then copy the result.
FAQ
Is SHA-1 secure?
No — SHA-1 is considered cryptographically weak and should not be used for new security-sensitive applications. It remains common for checksums, Git object hashes, and legacy system compatibility.
Why does this tool still offer SHA-1 if it's weak?
Many existing systems, checksums, and file formats still publish SHA-1 values, so verifying against them is still a legitimate, common need — even though new designs shouldn't rely on SHA-1 for security.
How long is a SHA-1 hash?
160 bits, shown here as 40 hexadecimal characters.
Is my text or file uploaded anywhere?
No — the SHA-1 hash is calculated locally in your browser using the browser's own cryptographic API.
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