Binary file formats

ICO directory entry decoder

Read one ICONDIRENTRY’s dimensions, bit fields and image byte range.

Your inputs

Start with an example

Example result

Zero width/height bytes mean 256. Planes, bit count, image length and file offset use little-endian integers.

The default entry describes 256×256, bit-count field 32, 4200 image bytes starting at offset 22.

For ICO files, not resource-group entries. The image may contain PNG or DIB data; this does not inspect that image or file bounds.