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Convert ICO to AVIF

Free, instant and private — your ICO files are converted right in your browser and never uploaded to a server.

How to convert ICO to AVIF

  1. Step 01

    Add your ICO files

    Drop them into the box above or click to browse. You can add several files at once.

  2. Step 02

    Conversion starts instantly

    It runs in your browser using its built-in image engine — no upload, no queue, no waiting.

  3. Step 03

    Download your AVIF files

    Save each file individually or grab them all at once. Done.

Why convert ICO to AVIF?

Need the image inside an .ico file as the smallest possible web-ready format? Converting to AVIF extracts it and re-encodes it with the most efficient mainstream image codec, keeping transparency intact at a fraction of the size of PNG or WebP. It all runs in your browser; nothing is uploaded.

ICO vs AVIF at a glance

ICO is the Windows icon container — bundles several sizes in one file, still the format browsers expect for favicon.ico. AVIF is the newest mainstream image format — outstanding compression, but support outside browsers is still patchy.

PropertyICOAVIF
Extension.ico.avif
Full nameWindows IconAV1 Image File Format
First released19852019
Developed byMicrosoftAlliance for Open Media
CompressionLosslessLossy
TransparencyYesYes
AnimationNoYes
Best forfavicons and Windows application iconsnext-generation web images with maximum compression

ICO to AVIF — frequently asked questions

Is this ICO to AVIF converter really free?

Yes — completely free, with no sign-up, no watermarks and no daily limits.

Are my ICO files uploaded to a server?

No. The conversion happens entirely on your device using your browser's built-in image engine. Your ICO files never leave your computer or phone — which is also why the conversion is nearly instant.

Will I lose quality converting to AVIF?

AVIF uses lossy compression, so the image is re-encoded at high quality (92%). For photos the difference is practically invisible; for text-heavy graphics or logos, a lossless format like PNG preserves sharp edges better.

Which size is extracted from the ICO?

An ICO can hold several sizes; we export the one your browser decodes — typically the largest available — as an AVIF.

Is transparency kept?

Yes. If your ICO has a transparent background, the resulting AVIF keeps it.

Related conversions

Need the reverse? Convert AVIF to ICOExplore the AVIF converter