ICO to AVIF Converter – Compact AVIF from an icon

An icon reused on a modern web page can be smaller as AVIF than as the PNG data inside the ICO file, which is the point of this pair. ICO is a container format for icons that can hold several sizes of the same picture in one file, used for favicons and app icons. This free ico to avif converter does that conversion entirely in your browser, so your file is never uploaded and no signup is needed. AVIF output is encoded by your browser at the quality you choose, so file size and quality trade off against each other. The honest limits: AVIF encoding depends on your browser. If it cannot encode AVIF, the tool reports that plainly instead of handing you a mislabeled file.

How to use this ico to avif converter

From a ICO file to a AVIF file, without uploading anything.

1Drop in your ICO file

Choose a .ico file from your device, or drag it onto the tool.

2Pick an AVIF quality

Choose a quality from 1 to 100. Higher keeps more detail and a larger file; lower shrinks the file further.

3Download the AVIF file

The converted file downloads with the same base name and the new extension, ready to use.

Why convert ICO to AVIF

An icon reused on a modern web page can be smaller as AVIF than as the PNG data inside the ICO file, which is the point of this pair.

The right format for the job

ICO is a container format for icons that can hold several sizes of the same picture in one file, used for favicons and app icons.

What AVIF gives you

AVIF output is encoded by your browser at the quality you choose, so file size and quality trade off against each other.

Watch out for this

AVIF encoding depends on your browser. If it cannot encode AVIF, the tool reports that plainly instead of handing you a mislabeled file.

Private by design

Decoding and encoding happen on your own device, so personal photos and unpublished artwork never leave your browser.

ICO to AVIF Converter FAQs

Short, direct answers to the questions readers ask most.

Quality depends on the setting you choose and on the source. A high quality setting keeps more detail with a larger file; a low setting shrinks the file at visible cost. The tool never claims a fixed size saving.

ICO is a container format for icons that can hold several sizes of the same picture in one file, used for favicons and app icons.

AVIF output is encoded by your browser at the quality you choose, so file size and quality trade off against each other.

AVIF encoding depends on your browser. If it cannot encode AVIF, the tool reports that plainly instead of handing you a mislabeled file.

Yes. It runs entirely in your browser, with no account, no signup, and nothing uploaded.