How do I check the SHA-256 checksum of a downloaded file?

Drop the file onto the tool, then paste the publisher's checksum into Verify against a published checksum. A green match message names the algorithm; a no-match message means the file differs or the algorithm differs.

Which hash algorithms does the file hash tool support?

It computes SHA-256, MD5, SHA-1, SHA-384, SHA-512 and CRC-32. MD5 and CRC-32 come from the hash-wasm library; the SHA family uses the browser's Web Crypto. SHA-1 is flagged as weak for security use.

Can it hash a very large file like an ISO without freezing?

Large files are read in 8 MB chunks and hashed incrementally, so memory use stays flat. Progress and speed are shown, and you can click Cancel. Files that cannot be read or are too large for the device show an error.

How do I verify several files against a SHA256SUMS file?

Paste the checksum list, or use Or open a checksum file, with one 'hash filename' per line. Add the files (up to 20 at once) and each shows OK or FAILED, plus a summary of how many match.

How do I compare two files to see if they are identical?

Add both files, or use Compare with a second file. The tool compares their SHA-256 checksums and reports Identical or Different. If a pasted checksum is base64 or uppercase, it is still matched.

Yes. Every tool is free to use, with no account and no credit card. The work runs on your device rather than on our servers, which is what keeps it free to run.

Are my files uploaded?

No. Your files are opened and processed inside your browser and are not sent to LibraTool. Some tools first download a processing engine or AI model to your browser; that download contains no data of yours.

Does it work on mobile?

Yes. It runs in current mobile browsers on iOS and Android, with nothing to install. Very large files can be slow or run out of memory on a phone, so use a computer for those.

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Free File Hash / Checksum

Compute SHA-256, SHA-1, SHA-384, and SHA-512 checksums of any file and verify a download against its published hash. The file is never uploaded.

File size depends on your deviceFiles stay privateNo login requiredFree forever

Drop files here, or click to browse

Any file · processed on your device

or press Ctrl+V to paste from your clipboard

You can drop multiple files at once

Browse files

Your files never leave your device. All processing happens locally in your browser.

Compute SHA-256, SHA-1, SHA-384, and SHA-512 checksums of any file — and verify a download against its published hash. The file is read locally and never uploaded.

Common uses

Verify a Download's ChecksumConfirm a downloaded file matches the checksum the publisher posted.
Get the SHA-256 of a FileCompute a file's SHA-256 hash to publish or compare.
Check File IntegrityDetect whether a file has changed or been corrupted.
Confirm Two Files Are IdenticalHash two files and compare to see if they're byte-for-byte the same.
Publish a Checksum with Your FileGenerate a checksum to list alongside a file you distribute.

How It Works

A checksum is a fingerprint of a file. Publishers list one next to a download so you can confirm the file you got is exactly the one they released — not corrupted or tampered with. This computes them in your browser.

1
You pick a file
It's read into memory locally — never uploaded, no matter the size.
2
Web Crypto hashes it
The browser's native crypto.subtle computes SHA-256, SHA-1, SHA-384, and SHA-512 in a single pass over the bytes.
3
You compare to the published hash
Paste the checksum from the download page; it's matched against all four algorithms and a clear ✓/✗ tells you if the file is authentic.
4
Copy any hash
Grab a checksum to publish alongside your own files.

Verifying a sensitive download (an installer, a disk image, a backup) shouldn't require uploading it anywhere. The hash is computed entirely on your device with native browser crypto.

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