File Hash Calculator – Private Multi-Algorithm Checksums

Hash any file with SHA-224/256/512, SHA-3, BLAKE3, CRC32 and more. 100% client-side. Files never leave your browser.

No uploads. No account. Free to use.

Several checksums for one file, all local.

Drop a file

Nothing is uploaded. Processing stays on this device.

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Opens Google’s picker with toolswithoutai.com pre-filled.

Files never leave your device
Runs entirely in your browser
No signup required
Free

What is File Hash Calculator – Private Multi-Algorithm Checksums?

Verify the integrity of downloads, evidence, or software releases without risking the file contents. All hashing happens via the File API and Web Crypto / pure-JS libraries inside your browser.

Key features

Multiple algorithms side-by-side
drag-and-drop
large-file friendly (streaming where possible)
progress indicator
copy individual or all
PDF report option if implemented
100% local.

How to use it

Drop or select file.
Algorithms compute in parallel or on demand.
Copy the digests you need.

When to use it

Upload-based hash sites are a privacy risk for sensitive or large files. We never receive the bytes.

Frequently asked questions

Max file size?

Browser memory / practical limits. Which algorithm? SHA-256 or BLAKE3 for most modern use. Uploaded? Absolutely not.