About this conversion
BMP stores pixels uncompressed, which some legacy Windows software, embedded systems, or specific print/imaging workflows still require. Expect a much larger file than the PNG you started with -- that’s inherent to the format, not a bug.
Frequently asked questions
Why is the BMP so much bigger than my PNG?
BMP (as produced here) stores every pixel with no compression at all, while PNG compresses losslessly. This is expected and correct.
Does BMP support transparency?
Not in the 24-bit format this tool produces -- transparent areas are flattened onto white, the same convention used for this tool’s GIF output.
Why would I want BMP over PNG?
Mainly compatibility with older or specialized software that expects raw, uncompressed bitmap data.