FontChecksum 2

FontChecksum is a Java 1.4 application to verify the internal checksums in OpenType and TrueType font files.

Sometimes when you download a file, or copy a file from a worn CD/DVD, what you receive differs from the original. After downloading or copying twice, you may have two files with the same size, the same date, and the same apparent contents.

When compared byte-by-byte with commands such as "comp" on DOS/Windows or "cmp" on UNIX, only a few bits or bytes are different. The rest of the files are the same.

Your question is which file is correct. One of them must be wrong. (Both could be wrong!) Since font files contain internal checksums, you can use this information to test which of the files is more correct.

The freeware and shareware fonts that are produced with older font tools have numerous checksum errors.