Calculate and compare ROM checksums in the browser

Calculate CRC32, MD5, SHA-1, and other file checksums in your browser, then compare them with an expected value. Your file stays on your device.

To identify your file, use Identify a ROM by checksum. Already have a hash? Use ROM checksum search to find database records. For terminal procedures, see Hash a file.

Calculate checksums

Open Checksum file.
Select the algorithms in Options. CRC32, MD5, and SHA-1 are selected by default.
Leave Auto extract checked to open archives and containers. Clear it to checksum the original file.
Add one or more files. If an archive contains several files, choose the file to check.
Wait for Checksums to show the results.

Each added file gets its own result card, and a new drop replaces the earlier files. You can add a text file, patch, ROM, archive, or any other file. Select a checksum row to copy its value.

The checksum page shows 0x01 Input and 0x02 Options, with algorithm choices and Auto extract checked — Choose algorithms and extraction in Options before adding a file.

Add an algorithm

Select another algorithm, for example SHA-256.
Select Calculate SHA-256.

With Auto extract checked, an archive can ask you to select its file again. Each calculation covers every file on the page.

To stop a calculation, cancel it from the progress bar. The previous results stay available.

The checksum support table lists every algorithm.

Compare with an expected checksum

Paste the expected value into Compare with an expected checksum.
Read the result under the field.

File checksum choices, Auto extract, and a matching SHA-256 — A pasted SHA-256 matches the calculated value.

A match names the algorithm. For ROMs with known headers or byte orders, a match can also name a transformed variant.

An 8-character or 64-character value can belong to several algorithms. If another algorithm is needed, select it and calculate it.

If no checksum matches, check that you selected the correct file and extraction setting.