ICO to AVIF Converter

About ICO to AVIF

Reads a Windows icon file (.ico) and re-encodes its picture as a real AVIF image. Icons are tiny, usually between 16 and 256 pixels, and often carry transparency, so this tool suits people who want to inspect or repackage a favicon in a modern format. Encoding uses an AVIF encoder that runs in your browser tab, so it does not depend on which browser you use.

How to use it

1. Drop an ICO file onto the drop zone, or click to browse for a .ico file.
2. Check the Source preview to see which image your browser decoded from the icon.
3. Adjust the Quality slider if you like; it starts at 85, and there is no size choice.
4. Press Convert to AVIF. The first run is a little slower because the encoder loads on demand.
5. Look at the Output panel and press Download AVIF.

When to use it

• Repackaging a site favicon as AVIF to compare its byte size with the original ICO.
• Extracting a scalable-looking still image from an icon file for a mockup.
• Checking whether the transparent background of an icon survives conversion to a newer format.

Questions about ICO to AVIF

An ICO can hold several sizes. Which one is converted?

The browser decides which embedded image to draw, and this tool converts exactly what the browser shows in the Source preview. The tool has no picker for choosing among sizes.

Will the converted image be larger than the icon?

The output keeps the decoded pixel dimensions, so it stays icon-sized. Do not expect it to gain resolution; enlarging a 32 pixel icon would only blur it.

Does the transparent background survive?

Yes. The tool does not paint a background for AVIF, and the encoder writes an alpha channel, so transparent pixels in the icon stay transparent in the AVIF file.

Why would anyone convert an icon to AVIF?

Mostly for experiments and size comparisons. Browsers still expect favicons as ICO, PNG or SVG, so an AVIF result is rarely a drop-in favicon replacement.

Related tools

• AVIF to ICOConvert AVIF images to ICO format in your browser — no upload required.
• PNG to AVIFConvert PNG images to AVIF format in your browser — no upload required.
• JPG to AVIFConvert JPG images to AVIF format in your browser — no upload required.
• BMP to AVIFConvert BMP images to AVIF format in your browser — no upload required.
• GIF to AVIFConvert GIF images to AVIF format in your browser — no upload required.
• WEBP to AVIFConvert WEBP images to AVIF format in your browser — no upload required.