File Checksum Calculator
Calculate MD5, SHA-1, SHA-256, SHA-512 checksums for any file — 100% private.
Drop any file here or click to browse
All processing happens in your browser — no files are uploaded
File Name
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Size
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Type
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— ✓ — ✓ — ✓ — ✓ Paste an expected checksum — the algorithm is auto-detected by length.
How to Use the File Checksum Calculator
- Drop or browse to select any file — no size limit (processing is all in-browser).
- MD5, SHA-1, SHA-256, and SHA-512 checksums are computed automatically and displayed.
- Click Copy next to any hash to copy it to the clipboard.
- Paste an expected hash in the Verify field to confirm file integrity.
About Checksums
A checksum (or hash) is a fixed-length fingerprint of a file's content. Even a single changed byte produces a completely different hash. Software downloads, ISO images, and security tools often publish official checksums so you can verify you received an unmodified copy. SHA-256 and SHA-512 are preferred for security purposes; MD5 and SHA-1 are still widely used for general integrity checks.
All computation uses the browser's built-in Web Crypto API (SHA family) and an RFC 1321-compliant MD5 implementation running locally. No data ever leaves your device.