ICO to AVIF Converter

ICO to AVIF — and Whether AVIF Is the Right Target for an Icon

People reach this page wanting to turn a Windows icon into a modern AVIF image. The conversion works and produces a tiny, efficient file, but it pays to know the catch first: an ICO frame is at most 256×256 pixels and usually far smaller, so the AVIF you get is a small image — converting cannot add resolution or sharpness the icon never had. If your goal is a favicon, AVIF is the wrong format (browsers still expect ICO, PNG, or SVG there). AVIF earns its place when you want to embed an icon or logo as an asset in a modern web pipeline that already standardizes on AVIF. This page compares the two formats, says when each makes sense, then walks the conversion.

ICO vs AVIF — Side-by-side Comparison

When to Pick ICO (Keep or Convert To ICO)

• You need a favicon. Browsers reliably read /favicon.ico; AVIF favicons are not broadly supported. To make an icon, use PNG to ICO instead.
• You want one file that holds several sizes. ICO bundles 16×16, 32×32, 48×48, and 256×256 in a single container so the OS picks the nearest fit — AVIF stores only one image.
• You target Windows shortcuts, app icons, or older software that expects the ICO container.
• You need maximum compatibility with no fallback chain.

When to Pick AVIF

• Your site or build pipeline already serves AVIF and you want the icon's artwork as a matching asset.
• You want the smallest possible file for a logo or icon graphic — AVIF is among the most space-efficient still formats available.
• You need a single resolution, not a multi-size container — for example one 256×256 logo for a web component, not a favicon bundle.
• You'll serve it with a fallback. The robust pattern is AVIF inside an HTML <picture> element with a PNG or WebP fallback for the ~7% of users on older browsers.

For most visitors who landed here looking to make a favicon, the honest answer is that AVIF is not it — but as a way to pull an icon's artwork into a modern, AVIF-first image workflow, the conversion is genuinely useful.

How to Convert ICO to AVIF

1. Upload Your ICO File: Drag and drop your .ico onto the page or click "Add Files" to browse. Multi-size containers are accepted, and you can queue several icons for batch conversion.
2. Pick a Quality Preset: Open Advanced Options. "Quality Preset" defaults to "Very High (Recommended)"; choose "Highest" to keep maximum fidelity, or "High"/"Medium" and below to shrink the file further. Under "Show All Options" you can also set the encoder's compression Level and Speed.
3. Cap the size or resize (Optional): Use "Specific file size" to hit an exact target, or open "Image resolution" to keep the original size, scale by percentage, or set a custom Width × Height.
4. Convert and Download: Click "Convert" and download your AVIF. No sign-up, no watermark.

Frequently Asked Questions

My ICO holds several sizes — which one becomes the AVIF?

The largest image stored in the container is selected, because it carries the most detail. A favicon ICO holding 16×16, 32×32, 48×48, and 256×256 produces a 256×256 AVIF. That is the same nearest-/largest-fit logic Windows uses when it draws an icon. If you want a smaller output, use the "Image resolution" controls in step 3 to scale it down — there is no benefit to upscaling past the icon's native size.

Will converting an ICO to AVIF make it sharper or higher resolution?

No. An ICO image is at most 256×256 pixels and often just 16, 32, or 48 pixels wide. AVIF is an efficient container, but it cannot invent detail that was never captured — if you set a large output size, the converter enlarges the same soft pixels rather than adding sharpness. The honest result of this conversion is a small, highly compressed AVIF of a small image. For a crisp full-size graphic, start from the original artwork, not the icon.

Does the transparency in my ICO survive the conversion?

Yes. AVIF stores a full alpha channel as a separate auxiliary image, and the 32-bit RGBA images inside most modern ICO files carry their transparency over. If your ICO uses only the older 1-bit AND mask (fully transparent or fully opaque, no blending), that maps to hard-edged alpha in the AVIF — a limitation of the source, not the conversion.

Is AVIF a good favicon format in 2026?

Not really. Browsers do not broadly accept an AVIF favicon, so the dependable pattern is still an ICO at /favicon.ico plus explicit <link rel="icon"> tags for PNG or SVG. Use ICO→AVIF when you want the icon's artwork as a regular AVIF image asset — for a logo in an AVIF-first page, a design system, or an app component — not as a drop-in favicon. To build a favicon, go the other direction with PNG to ICO.

Should I convert an icon to AVIF or to PNG?

For an icon you might re-edit, place in any editor, or use as a favicon source, ICO to PNG is the safer, lossless pick and opens everywhere. Choose AVIF when file size is the priority and your delivery pipeline already serves AVIF with a fallback. PNG maximizes compatibility; AVIF maximizes compression.

Lossy or lossless AVIF — which should I use for icon art?

For flat icon art, logos, and low-color graphics, lossless AVIF keeps every pixel exact and still compresses tightly because of the large solid regions. For photographic or gradient-heavy icons headed to a CDN, the default lossy "Very High" preset is usually visually indistinguishable and produces a smaller file. In our testing, a 256×256 RGBA icon at the "Very High" preset produced an AVIF in the low single-digit kilobytes — a fraction of the equivalent PNG slice.

How are my uploaded ICO files handled?

Your file is uploaded over an encrypted connection, decoded and re-encoded to AVIF on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public. The main practical limit is upload size and time, not your device. Because an icon is small, both the upload and the resulting AVIF are tiny.