Checksum guide

Getting started with Checksum

Checksum tells you the hash of a file, and whether it matches the hash its publisher gave you. The file is read in your browser and never uploaded.

Open Checksum

Get the hash of a file

The page has three cards, numbered in the order you use them.

1. Under 1. Choose a file, click Choose a file, or drop it here, and pick the file. You can also drop the file on that box.
2. Under 2. Hashes, the hash appears. The line under the file box says which algorithm was used and the file name.
3. Click Copy hash to put the hash on the clipboard.

Choose the algorithm

The Algorithm list has SHA-256 (the default), SHA-1, SHA-384 and SHA-512. Pick one and the hash is computed again for the same file.

Use the algorithm the publisher used. SHA-1 is there only to match older published hashes. Use SHA-256 for new checks.

Check a download against its published hash

Spaces, upper case letters and a prefix such as "sha256:" are ignored. If the length is wrong, Checksum says so and asks you to check the algorithm.

1. Choose the file you downloaded, as above.
2. Copy the hash from the download page.
3. Paste it into Expected hash, under 3. Check against a published hash.
4. Read the line below it. Match means the file is the one that was published. No match means the file differs.

Tip: Checksum hashes one file at a time. Choose the next file to start again.