How do I convert WebP to AVIF?

Upload your WebP 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 WebP 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.

Will the animation be kept?

いいえ。AVIFはアニメーションを保持できないため、アニメーションWebPは最初のフレームとして保存されます。

WebP or AVIF: which should I use?

Use WebP for websites, online stores and blogs that need fast-loading images. 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.

WebPファイルとは？

WebP was designed by Google for the web. Google measured lossy WebP files at 25–34% smaller than comparable JPGs, and WebP also handles transparency and animation.

Is the WebP 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 WebP to AVIF — Smallest High-Quality Images

Convert WebP 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 WebP file or click to browse

Why convert WebP to AVIF?

AVIF files are usually smaller than WebP for the same picture, so pages load faster and uploads finish sooner.
Transparent areas stay transparent: AVIF supports smooth, partial transparency just like WebP.
AVIF is made for the smallest high-quality images for websites and apps.

What to expect when converting WebP to AVIF

AVIFはこのアニメーションを保持できないため、アニメーションWebPは最初のフレームとして保存されます。
AVIF uses lossy compression by default; raise the quality or switch on lossless in Settings for a closer copy.

WebPとAVIFの比較

機能	WebP	AVIF
氏名	WebP	AV1 Image File Format
由来	Released by Google in 2010	Released by the Alliance for Open Media in 2019
圧縮	非可逆または可逆	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	はい	はい
色	チャンネルあたり8ビット	8, 10 or 12 bits per channel, including HDR
開けるアプリ	All current browsers; some older desktop apps and upload forms reject it	Current Chrome, Edge, Firefox and Safari 16+; fewer editing apps
こんな方に最適	websites, online stores and blogs that need fast-loading images	the smallest high-quality images for websites and apps
主な欠点	古いアプリや一部のアップロードフォームでは受け付けられない	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 WebP for websites, online stores and blogs that need fast-loading images; choose AVIF for the smallest high-quality images for websites and apps.

Frequently asked questions

How do I convert WebP to AVIF?: Upload your WebP 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 WebP 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.
Will the animation be kept?: いいえ。AVIFはアニメーションを保持できないため、アニメーションWebPは最初のフレームとして保存されます。
WebP or AVIF: which should I use?: Use WebP for websites, online stores and blogs that need fast-loading images. 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.
WebPファイルとは？: WebP was designed by Google for the web. Google measured lossy WebP files at 25–34% smaller than comparable JPGs, and WebP also handles transparency and animation.
Is the WebP 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.

WebP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 WebP files to AVIF online
Choose AVIF quality or switch to lossless
Switch to any other output format in Settings
Batch-convert many WebP 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

WebP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）。