Files · File Checksum

Check SHA-256 and MD5 checksums on Mac

Verify downloads with SHA-256, SHA-512, SHA-1 or MD5 hashes.

Runs on your MacFinder Quick Action

Three steps. That's it.

1
Drop your files
Drag files onto File Checksum, choose them with Choose Files, or right-click them in Finder.
2
Choose the options
Set what you need in the options panel, such as algorithm. Your choices are remembered for next time.
3
Get the result
The result lands in a new dated folder in Downloads › OneMacTools. Your originals are never changed.

What File Checksum does

Calculate checksums for files of any size and compare them with the one published by the download site, so you know the file wasn't corrupted or tampered with.

It's also a Finder Quick Action: right-click files and choose OMT: Copy SHA-256 Checksum.

Options

Algorithm: SHA-256, SHA-512, SHA-1 or MD5Compare with an expected hashCopy to the clipboard

Great for

Verify a downloaded installer
Check a backup copied correctly
Confirm two files are identical

Questions about File Checksum

Does File Checksum upload my files?

No. File Checksum runs entirely on your Mac, so your files never leave it and it works offline.

Will File Checksum change my original files?

No. Results are saved as new files in a dated folder in Downloads › OneMacTools, and your originals are left exactly as they were unless you turn on an option that says otherwise.

What does File Checksum need?

Just a Mac with macOS 26 or later. There's nothing else to install.

Can I use File Checksum from Finder?

Yes. Right-click files in Finder and choose Quick Actions › “OMT: Copy SHA-256 Checksum”. It runs in the background and notifies you when it's done.