How do I convert AVIF to ICO?

Add your AVIF file to the upload area above, then press Convert. The ICO file downloads straight to your device. You do not need an account, and there is no watermark.

Are my files uploaded to a server?

No. This conversion runs entirely inside your browser using WebAssembly, so the file never leaves your device — you can even disconnect from the internet after the page loads and it will still work.

Does converting to ICO reduce quality?

No. ICO is a lossless format, so the conversion preserves exactly what is in your AVIF file. Note that it cannot recover detail that was already discarded when the AVIF was first created — a lossless container does not undo earlier compression.

How large a file can I convert?

Up to 120 MB per file for this conversion. Because the work happens in your browser, the practical limit is your device's memory — larger files work on a desktop with plenty of RAM and may fail on an older phone.

Can I convert several files at once?

Yes. Add as many as you like and press Convert All. Each file is processed independently, so one failure does not stop the rest, and you can download everything together as a ZIP.

Can I use this on my phone?

Yes. FileTools360 works in mobile browsers on iOS and Android, including choosing files straight from your camera roll. Very large videos may run out of memory on a phone — those are better converted on a laptop.

ImageLosslessRuns in your browser

AVIF to ICO Converter

Turn AVIF files into ICO in a couple of clicks. Next-gen format with the best compression available today. Multi-resolution icon container for favicons and apps. The conversion is lossless — every pixel, sample or byte in the source is preserved.

On your deviceNever uploadedGone when you close the tabHow this works

Drop your files here

AVIF files (.avif) · up to 120 MB each

or paste files from your clipboard

Ready when you are

Drop a AVIF file above and FileTools360 will turn it into ICO — right here on your device, without uploading anything.

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How to use it

1
Add your AVIF files
Drag them onto the upload area, choose them from your device, or paste them from your clipboard. You can queue several at once.
2
Adjust the settings if you want to
The defaults suit most people. Open Advanced to control dimensions, rotation and metadata removal.
3
Convert and download
Press Convert. Everything happens on your own device — nothing is uploaded. Download files one by one, or grab them all as a ZIP.

AVIF and ICO explained

AVIF stores still images using the AV1 video codec's intra-frame compression. It generally achieves the smallest files of any widely supported format, and it handles wide colour gamut and HDR, which JPEG cannot.

ICO is a container that holds several versions of the same icon at different sizes, so the operating system or browser can pick the one that fits. It is capped at 256×256 pixels.

Where AVIF files come from: Performance-focused websites and modern image pipelines.
Where ICO is used: Website favicons and Windows application icons.

AVIF vs ICO

The two formats solve different problems, which is why converting between them involves trade-offs rather than a straight upgrade.

AVIF compared with ICO
Property	Source	Target
Compression	Lossy or lossless	Lossy or lossless
Transparency	Yes	Yes
Animation	Yes	No
Introduced	2019	1985
Browser support	Modern browsers only. Limited desktop app support.	Browsers and Windows. Sizes are capped at 256×256.

AVIF is stronger at: The best compression of any broadly supported image format. Handles HDR and wide colour gamut. Supports transparency and animation.
ICO is stronger at: Holds multiple resolutions in one file. The format browsers expect for favicon.ico. Supports transparency.

Why convert AVIF to ICO?

People make this switch when they run into the limits of AVIF: the file needs to be opened outside a browser, or you need fast bulk encoding. ICO is the better fit when you are making a favicon or a Windows application icon.

AVIF limitations that prompt the switch: Encoding is slow compared with JPEG or WebP. Desktop application support is still thin. Very low bitrates can smear fine detail in a distinctive way.
What you give up: Capped at 256×256. Not a general-purpose image format.

Does converting AVIF to ICO reduce quality?

Both formats store the content without discarding data, so this conversion preserves it exactly. The file size may change because the two formats compress differently, but the content itself is unaffected.