UtilTools

File Checksum Verifier

Verify a download against its published checksum.

File Checksum Verifier hashes a file with SHA-256, SHA-512, SHA-1 or MD5 and compares it against the value you paste, giving a clear match or mismatch rather than making you compare hex strings by eye. Files are streamed in chunks, so size is not a limit and nothing is uploaded.

Loading File Checksum Verifier…

Runs entirely on your device. No file or text you enter here is uploaded. How to verify it.

How to use File Checksum Verifier

  1. Drop the downloaded file.
  2. Paste the checksum published by the source.
  3. Read the match or mismatch verdict.

Questions about File Checksum Verifier

What does a mismatch mean?
The file is not the one the checksum describes. Usually an interrupted or corrupted download — try again. Occasionally it means the file was tampered with in transit or you took the checksum from a different version.
Does a matching checksum prove the file is safe?
It proves the file matches what the publisher listed. If an attacker controls both the file and the page listing the checksum, both match and both are hostile. Signature verification with a known public key is the stronger check.
Can it hash a very large ISO?
Yes. The file is read in chunks and hashed incrementally in a worker, so memory use stays flat regardless of file size, and the tab stays responsive.
Is there a maximum file size?
No practical one. The file is read in chunks and never held whole in memory, so a 20 GB image verifies with the same footprint as a small one. It takes longer, and disk read speed becomes the limit rather than the browser.
My Mac and Windows already have a command for this — why use a page?
They do: shasum -a 256 on macOS and Get-FileHash in PowerShell are perfectly good. This exists for when you would rather not open a terminal, and because comparing two long hex strings by eye is how mismatches get missed.
Is File Checksum Verifier really free, with no limits?
Yes. There is no account, no daily cap, no file-size tier and no watermark, because there is no server cost to recover. The site is funded by clearly disclosed partner recommendations on the Partners page, never by metering the tools.
Are my files or text uploaded when I use File Checksum Verifier?
No. Everything is processed by JavaScript running in your browser, on your device. You can verify it: open your browser's developer tools, switch to the Network tab, and use the tool. You will see no request carrying your data — because there is nowhere for it to go.