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AVIF to ICO Converter

AVIF makes tiny files, but many editors and older apps cannot open it. Converting to Windows ICO icons gives you the icon format browsers look for at /favicon.ico and Windows uses for shortcuts. Encoding is slow and application support lags well behind browsers. Older editors, office suites, printers and any number of internal tools simply will not open an .avif, so a file that displays perfectly in a browser can be unusable in the software you actually need. Website favicons and Windows shortcut icons — a square source with clear shapes that still read at 16 pixels. Drop your files below and the work happens on your own machine: the conversion runs in the browser through the Canvas API, so nothing is uploaded, there is no file-size cap, no watermark and no sign-up. Batches are fine — drop a folder's worth and take them back as a single ZIP.

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Private: files never leave your device

What a AVIF file actually is

AVIF wraps the royalty-free AV1 video codec as a still-image format. It compresses harder than anything else in wide use — commonly around half the size of an equivalent JPEG — and adds real range: 10- and 12-bit colour, HDR, wide gamut and an alpha channel.

AVIF files come from modern websites and image pipelines that adopted it for the bandwidth saving. Chrome shipped support in 2020 and Safari in 16.4 in 2023, so it is common on the web and rare on the desktop.

What you get from ICO

ICO is a container that holds one or more small square images, with transparency, for use as an icon. It caps out at 256×256 — anything larger has to be scaled down, and the format is not intended for general pictures.

Every browser requests /favicon.ico by default, with no HTML required, and Windows uses ICO for application and shortcut icons. It is a narrow format that is completely reliable inside its niche.

What changes when you convert AVIF to ICO

An icon is being built here, not a picture converted. The AVIF is decoded, scaled to fit within 256×256 and stored losslessly inside the ICO container — so whatever compression artifacts the original carried are preserved faithfully, then shrunk to the point where nobody will ever see them. Detail is lost to the scaling, which is the intended outcome.

Transparency survives intact. Both AVIF and ICO carry a full 8-bit alpha channel, so cut-outs, drop shadows and anti-aliased edges convert without a white box appearing behind them, and the result still composites cleanly onto any background colour.

ICO cannot exceed 256×256, so anything larger is scaled down to fit while keeping its aspect ratio. Work from a square source if you can — a wide image gets letterboxed into the square, and fine detail disappears entirely at the 16-pixel size a browser tab actually renders.

AVIF sources are usually pulled from a modern web page, which means the file has been compressed hard for bandwidth and may carry 10-bit or HDR colour that an icon has no use for. Both facts stop mattering at 256 pixels: the artifacts vanish along with every other fine detail, and the colour is flattened to ordinary 8-bit. The real risk is resolution — a hero image scaled for a page banner may be wider than it is tall, and cropping it square is where a logo loses its balance.

Frequently asked questions

Is this AVIF to ICO converter really free and private?

Yes. Conversion happens entirely in your browser using the Canvas API — your AVIF images are never uploaded to a server, there is no file limit, no watermark and no sign-up.

Can I convert multiple AVIF files at once?

Yes — drop any number of files and they convert in one batch. Use "Download all" to save the results as a single ZIP.

What size will my ICO file be?

ICO cannot store an image larger than 256×256, so anything bigger is scaled down to fit while keeping its aspect ratio. For a browser favicon a square source works best — 256×256 covers every modern use, and browsers scale it down to the 16 or 32 pixel tab icon themselves.

How do I use this as my website favicon?

Save the file as favicon.ico in your site's root directory. Browsers request /favicon.ico automatically, so no HTML is strictly needed — though adding <link rel="icon" href="/favicon.ico"> makes it explicit.

Does converting AVIF to ICO lose quality?

An icon is being built here, not a picture converted. The AVIF is decoded, scaled to fit within 256×256 and stored losslessly inside the ICO container — so whatever compression artifacts the original carried are preserved faithfully, then shrunk to the point where nobody will ever see them. Detail is lost to the scaling, which is the intended outcome.

Should the icon be square?

Yes. ICO holds square images, so a wide or tall source is fitted into the square and ends up with empty space around it. Start from a square design with generous margins — the tab icon renders at 16 pixels, where anything intricate turns to mush.

AVIF looks great — why convert away from it at all?

Support outside the browser. Older editors, office suites, print portals and plenty of internal tools cannot open an .avif at all, so a file that displays perfectly on a web page is unusable in the software you actually need.

Related conversions

JPG → ICOPNG → ICOWebP → ICOHEIC → ICOAVIF → JPGAVIF → PNG

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