Font formats
OpenType checksum helper
Calculate a table checksum or the whole-font head.checkSumAdjustment value.
Your inputs
Start with an exampleYour result
Example resultAa — A small example of your colors.
How it works
Sum big-endian 32-bit words modulo 2³² with zero padding. Head-table mode zeros its adjustment bytes; font mode subtracts the zeroed-font sum from B1B0AFBA hex.
Table bytes 00 01 00 00 have checksum 00010000 hex; 01 02 03 pads to 01 02 03 00.
Limits
Single TrueType/OpenType SFNT files only; no TTC or WOFF. This does not repair bytes, verify every table checksum or certify complete font validity.