Why you get several files back
A proper favicon isn't one image — it's a directory of resolutions packed into a single .ico, so browsers, bookmark bars and desktop shortcuts can each pick the crispest fit. Most converters quietly hand you a single size and throw the rest away. This one parses the container and returns every entry — named by its dimensions, like favicon-32x32.png — with transparency intact.
Both kinds of entries are handled: modern PNG-compressed ones (usually the 256 px layer) and classic BMP-style ones from older icons. Everything is decoded on your device; the file never leaves your browser.
Frequently asked questions
Why did I get multiple PNGs from one file?
Because the ICO genuinely contains multiple images. Each PNG is one size layer of the icon — pick the one you need.
Does transparency survive?
Yes — alpha channels are preserved in every extracted size, including old BMP-style entries where transparency is stored as a separate mask.
Can it read .cur cursor files?
Often yes — CUR uses the same container structure. The hotspot metadata is ignored; you get the images.