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Drop one ICO or two hundred. Batch conversion is not a paid feature here.
Convert ICO to PNG
A favicon or a Windows application icon needs to be edited, rebranded or reused as an ordinary image.
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What actually changes
ICO and PNG are not the same picture in two wrappers.
An ICO is a container holding several images at different sizes. The conversion decodes it and writes a PNG, keeping the alpha channel so the rounded or irregular icon shape stays intact.
Worth knowing first
ICO files hold multiple resolutions, commonly 16, 32, 48 and 256 pixels, and a single PNG can only hold one. You get the largest entry, so an icon whose 256 pixel slot is missing converts to something small and blurry when scaled up.
Questions
ICO to PNG, answered
Which size comes out?
The largest image stored inside the ICO. If the icon was only ever authored at 32 pixels, that is all there is.
Are ICO files just renamed PNGs?
Not usually. Since Windows Vista an ICO entry may hold PNG data, but older icons hold BMP-style data with a separate mask, which is why a plain rename often fails.
How to convert ICO to PNG
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Choose your settings
Portable Network Graphics is lossless, so nothing is thrown away in the conversion.
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Download
Instant, because the file never went anywhere. Nothing expires, since nothing was stored.