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AVIF to ICO Converter

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

Not uploaded to any serverConverted on this deviceGone 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.

⌘K to search converters

How to use it

  1. 1

    Add your AVIF files

    Drag them onto the drop area, choose them from your device, or paste them from your clipboard. You can queue several at once. Nothing is sent anywhere — the file stays on this device.

  2. 2

    Adjust the settings if you want to

    The defaults suit most people. Open Advanced to control metadata removal.

  3. 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.

Privacy, in plain words

Is it safe? Your AVIF file is not uploaded anywhere

What “uploaded” normally means. On most online converters, pressing the button copies your file across the internet onto a computer owned by that website. That copy is what the word “upload” means, and it is the part nobody explains.

What happens instead. This site does not do it. There is no server here that receives files, so your AVIF file is read, converted and handed back by the browser you are using right now. It never travels — so there is no copy to store, read, leak or hand over.

Check it yourself in ten seconds

Turn off your Wi-Fi after this page has loaded, then convert a file anyway. It still works, because everything needed is already on your device.

The longer explanation of how this works, and the full detail of what is and is not stored on the privacy page.

Why this matters more than it sounds

Photographs carry more than what is in the frame — most also carry the time, the device and often the GPS coordinates where they were taken. It matters more than it sounds, because of what images usually are:

Screenshots of private messages

conversations that included other people

Photos of ID cards and licences

the usual way people send identity documents

Screenshots of bank transfers

account details, and proof of what you paid whom

Medical scans and photographs

X-rays, results, images of a condition

A file that is never sent cannot be kept, leaked, subpoenaed or used to train anything. That is a property of how this works, not a promise about how carefully it is run.

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
PropertySourceTarget
CompressionLossy or losslessLossy or lossless
TransparencyYesYes
AnimationYesNo
Introduced20191985
Browser supportModern 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.

About these formats

Source

AV1 Image File Format

Next-gen format with the best compression available today.

Extensions
.avif
MIME type
image/avif
Best for
Smallest web images · HDR and wide gamut · Photography
Compatibility
Modern browsers only. Limited desktop app support.

Target

Windows Icon

Multi-resolution icon container for favicons and apps.

Extensions
.ico
MIME type
image/x-icon
Best for
Favicons · Windows application icons
Compatibility
Browsers and Windows. Sizes are capped at 256×256.

Icons are capped at 256×256 by the ICO format itself. Larger sources are downscaled.

Good to know

AVIF to ICO Converter — questions

How do I convert AVIF to ICO?

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

Is it safe to convert AVIF files here — are they uploaded to a server?

No, nothing is uploaded. On most online converters, pressing the button copies your file across the internet onto a computer owned by that website; it is converted there and sent back. That copy is what "upload" means, and it is the part that puts your file out of your control. This site does not do it. Your AVIF file is read and converted by the browser you are using right now and never leaves this device, so there is no copy for anyone to store, read or hand over. You can prove it: turn off your Wi-Fi after this page loads and the conversion still works.

Can I convert confidential AVIF files, like bank statements or contracts?

Yes, and that is the case this site was built for. Because the file never leaves your device, a confidential document is no more exposed than it is sitting in your own folder — there is no transfer, no copy on someone else's hardware, no retention period to read about and no staff with access. Nothing is logged about the file either: not its name, not its size, not its contents. The one thing worth saying plainly is that this protects the file in transit and at rest on our side, not from anything already on your own computer.

What should I know before converting AVIF to ICO?

Icons are capped at 256×256 by the ICO format itself. Larger sources are downscaled.

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 images may run out of memory on a phone — those are better converted on a laptop.

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FileTools360 by the numbers

527 converters and tools65 file formatsnothing ever uploaded.