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File Checksum Calculator

Calculate SHA-256, SHA-512, and SHA-1 checksums for any file. Verify file integrity after downloads.

No uploads • Client-side only • Your data stays on your device

File Checksum Calculator workspace

What are checksums?

Checksums are unique "fingerprints" of files. If even one byte changes, the checksum is completely different. Use them to verify downloads haven't been tampered with or corrupted.

Your Privacy Guaranteed

All processing happens directly in your browser using JavaScript. Your files, passwords, and data never leave your device and are never uploaded to our servers. We cannot see, store, or access anything you process with this tool.

No account required • No tracking • No data collection • Works offline after initial load