SHA-1 File Checksum (Legacy)

Calculate a legacy SHA-1 checksum for compatibility, without uploading files.

How to use

1. Choose a file to calculate its legacy SHA-1 digest.
2. Use SHA-256 or SHA-512 instead for security-sensitive verification.

About these formats

SHA-1 produces a 160-bit hash (40 hexadecimal characters) but suffers from practical collision attacks. It is included solely for matching legacy checksums.

Browser limitations

Do not trust SHA-1 as a collision-resistant authentication mechanism. Processing buffers the file in memory.

Frequently asked questions

Is SHA-1 secure?

No. Use SHA-256 or SHA-512 for modern integrity checks.

Why offer SHA-1?

Some older archives publish only SHA-1 checksums.

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