SHA-256 file checksum
Check that a download is exactly the file its publisher released. Your file is read on your device and never uploaded.
- Your files are never uploaded
- Processed on your device
- Works offline
- Free, no sign-up
Drop your files here
any files · up to 20 files, 1024 MB each
or paste with Ctrl+VLive preview
Settings
We compare it for you and show a clear yes or no.
How it works
Add the file
Any file. It stays on your device.
Paste the expected checksum
Optional: copy it from the publisher's website.
See the result
Get the checksum and a clear match or no match.
Why check a checksum?
A checksum is a short fingerprint of a file. If even one byte changes, the fingerprint is completely different. Software publishers often list the SHA-256 checksum next to their downloads, so you can confirm the file was not damaged or tampered with on the way.
Paste the published checksum into Expected checksum, and the tool tells you clearly whether it matches.
Private, even for large files
The checksum is calculated by your browser's built-in Web Crypto. The file is never uploaded, which matters for private documents and installers. Files up to about 1 GB work on most computers.
Questions
Are my files uploaded?
No. The tool runs inside your browser, so your files are opened and processed on your own device. They are never sent to us or to anyone else.
Which algorithm should I use?
The one the publisher lists, usually SHA-256. SHA-1 is old and should only be used to check files that list it.
Is the comparison case-sensitive?
No. Upper and lower case letters and spaces are ignored.
How large can the file be?
Up to about 1 GB, depending on your device memory.
Related tools
More free tools that run on your device. No uploads