How do I convert ICO to AVIF?

Upload your ICO file above. It is converted to AVIF automatically (change the output format or quality in the Settings tab if you need to), then click Download. There is nothing to install.

Does converting ICO to AVIF lose quality?

AVIF is lossy by default, so some fine detail is discarded to make the file smaller. Raise the quality or switch on lossless in Settings for a closer copy.

Will the AVIF keep the transparent background?

Yes. AVIF supports smooth, partial transparency, so transparent areas stay transparent.

ICO or AVIF: which should I use?

Use ICO for website favicons and Windows app or shortcut icons. Use AVIF for the smallest high-quality images for websites and apps. Keep in mind the main drawback of AVIF: it is slow to create and many editing apps and older devices can't open it.

ICOファイルとは？

An ICO file bundles one picture at several sizes, from 16 to 256 pixels, so browsers and Windows can pick the sharpest version for a tab, bookmark or desktop shortcut.

Is the ICO to AVIF converter free?

Yes. Convert, preview and download a single result without creating an account. Premium adds batch conversion (many files into one ZIP) and larger uploads.

Convert ICO to AVIF — Smallest High-Quality Images

Convert ICO to AVIF online for very small web images that keep transparency. No software to install. Preview one free or batch-convert with Premium.

Drop your ICO file or click to browse

Why convert ICO to AVIF?

Transparent areas stay transparent: AVIF supports smooth, partial transparency just like ICO.
AVIF is made for the smallest high-quality images for websites and apps.

What to expect when converting ICO to AVIF

AVIF uses lossy compression by default; raise the quality or switch on lossless in Settings for a closer copy.
元のICOファイルは変更されません。新しいAVIFのコピーをダウンロードします。

ICOとAVIFの比較

機能	ICO	AVIF
氏名	Windowsアイコン	AV1 Image File Format
由来	Created by Microsoft for Windows icons	Released by the Alliance for Open Media in 2019
圧縮	Lossless images at several sizes	非可逆または可逆
透過	Yes — smooth, partial transparency	Yes — smooth, partial transparency
アニメーション	いいえ	はい
色	透過対応のフルカラー	8, 10 or 12 bits per channel, including HDR
開けるアプリ	Browsers (as favicon.ico), Windows and icon editors	Current Chrome, Edge, Firefox and Safari 16+; fewer editing apps
こんな方に最適	website favicons and Windows app or shortcut icons	the smallest high-quality images for websites and apps
主な欠点	icons are square and at most 256 × 256 pixels	作成に時間がかかり、多くの編集アプリや古いデバイスでは開けない

In short: choose ICO for website favicons and Windows app or shortcut icons; choose AVIF for the smallest high-quality images for websites and apps.

Frequently asked questions

How do I convert ICO to AVIF?: Upload your ICO file above. It is converted to AVIF automatically (change the output format or quality in the Settings tab if you need to), then click Download. There is nothing to install.
Does converting ICO to AVIF lose quality?: AVIF is lossy by default, so some fine detail is discarded to make the file smaller. Raise the quality or switch on lossless in Settings for a closer copy.
Will the AVIF keep the transparent background?: Yes. AVIF supports smooth, partial transparency, so transparent areas stay transparent.
ICO or AVIF: which should I use?: Use ICO for website favicons and Windows app or shortcut icons. Use AVIF for the smallest high-quality images for websites and apps. Keep in mind the main drawback of AVIF: it is slow to create and many editing apps and older devices can't open it.
ICOファイルとは？: An ICO file bundles one picture at several sizes, from 16 to 256 pixels, so browsers and Windows can pick the sharpest version for a tab, bookmark or desktop shortcut.
Is the ICO to AVIF converter free?: Yes. Convert, preview and download a single result without creating an account. Premium adds batch conversion (many files into one ZIP) and larger uploads.

ICOからAVIFへでできること

始める前に、主な機能を確認してください。

Convert ICO files to AVIF online
Choose AVIF quality or switch to lossless
Switch to any other output format in Settings
Batch-convert many ICO files into one ZIP
Preview the result before you download

このツールを使用する

設定リファレンス

ICOからAVIFへで使用可能なコントロール。

設定

出力形式ドロップダウン: Chooses the file type you download. The page opens on its own output format; switch to any other format before converting.オプション: JPGPNGWebPAVIFGIFTIFFBMPICOPDF
品質スライダーレンジ: 20–100 · デフォルト: 90: For JPG, WebP, AVIF and image-to-PDF output: higher keeps more detail but makes a bigger file; 60–80 suits most photos. Documents (Publisher, XPS, EPS…) become PDFs with every page and sharp text, with no quality setting.
ロスレスモードオン/オフ: For WebP and AVIF output: keeps every pixel exactly (best for logos, graphics and transparency) at the cost of a larger file.
背景の塗りつぶしカラーピッカー: 透過を保存できないJPG、BMP、画像からPDFへの出力用：透明な部分を塗りつぶす色（既定は白）。