AVIF to ICO, explained
Make a 256 × 256 ICO file from a still AVIF image for an application that accepts PNG-backed icons. The converter fits the artwork without stretching and pads unused space with transparency. It creates one icon size, so check the destination’s requirements before using it as a favicon or application icon.
Choose one AVIF and check its preview, especially transparent edges and colors.
Keep ICO selected. Output is fixed at 256 × 256 pixels; a wide or tall source is centered with transparent padding.
Convert and download the .ico file, then open it in the target application. Keep the AVIF for future edits or a different export.
A real ICO file with one PNG-backed image
Renaming an AVIF to .ico does not change its format. This converter decodes the image and writes an ICO directory containing one 32-bit PNG-backed entry. It does not create separate 16, 32, 48 and 256 pixel representations. If your application requires a multi-size icon bundle or an older bitmap-backed ICO, use an icon editor that offers those options.
How a rectangular AVIF fits a square icon
The larger side is scaled to 256 pixels and the aspect ratio is preserved. For example, an 80 × 60 source occupies 256 × 192 pixels inside the 256 × 256 canvas, leaving 32 transparent pixels above and below. Smaller inputs are enlarged too, which cannot add missing detail. Crop to a square in an editor first if you want artwork to fill the square without padding.
Transparency is kept, backgrounds are not removed
Transparent pixels decoded from the AVIF remain transparent in the PNG-backed icon. An opaque white background stays part of the picture; conversion does not identify or remove it. Inspect the icon against both light and dark backgrounds, and compare how its edges look at the small size where it will actually be displayed.
Check AVIF color and still-image support
AVIF uses the browser’s native decoder first, with a local fallback for compatible sRGB still images. The icon is an 8-bit raster copy; original HDR appearance, profiles, bit depth and animation are not preserved. Unsupported fallback profiles or transforms are rejected. If the preview looks wrong, prepare a standard sRGB still image in the source editor before exporting an icon.
Using the result as a website or desktop icon
Downloading an ICO does not install it on a website or change a desktop shortcut. Add it through the destination’s icon setting or publish it with the website’s assets. Some destinations require other sizes or formats; an AVIF-to-PNG export may be more suitable. Custom resize controls do not change this converter’s fixed ICO size, and source images must still fit its 24-megapixel limit.
