File checksum generator
Calculate the SHA-256, SHA-1 or SHA-512 checksum of a file to check that a download is genuine.
🔒 Everything runs in your browser. Nothing you choose or type is uploaded. How to verify
How to use it
- Choose one or more files.
- Pick the algorithm.
- Select Run and compare the checksum with the one published by the source.
Handy for
Verifying downloads, comparing two copies of a file and recording file fingerprints.
Good to know
Prefer SHA-256 when the publisher offers it. A matching checksum shows the file is intact, but it only proves authenticity if the checksum came from a source you trust.
Privacy: where the work happens
Everything you enter or choose is processed by JavaScript in your browser and never sent anywhere. Only the page code, and any library this tool needs, is downloaded from cdnjs or jsDelivr.
Questions
Why compare checksums?
If one character differs from the published value, the file is damaged or has been altered.
Is the file uploaded?
No. The checksum is calculated by your browser.