How do I convert JFIF to AVIF?

Upload your JFIF 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 JFIF 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.

JFIF or AVIF: which should I use?

Use JFIF for nothing a JPG can't do — it holds the same image data. 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.

JFIFファイルとは？

A .jfif file is a JPEG with an unusual extension; Windows and some browsers save web images this way. The picture is identical to a .jpg, but many sites and apps refuse the .jfif name.

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

Convert JFIF to AVIF online for very small, high-quality web images. No software to install. Preview one free or batch-convert with Premium.

Drop your JFIF file or click to browse

Why convert JFIF to AVIF?

AVIF files are usually smaller than JFIF for the same picture, so pages load faster and uploads finish sooner.
AVIF is made for the smallest high-quality images for websites and apps.

What to expect when converting JFIF to AVIF

AVIF uses lossy compression by default; raise the quality or switch on lossless in Settings for a closer copy.
元のJFIF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。

JFIFとAVIFの比較

機能	JFIF	AVIF
氏名	JPEG File Interchange Format	AV1 Image File Format
由来	Defined in 1992 as the standard JPEG file layout	Released by the Alliance for Open Media in 2019
圧縮	非可逆（中身はJPEG）	非可逆または可逆
透過	いいえ	Yes — smooth, partial transparency
アニメーション	いいえ	はい
色	1,670万色（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	Most image viewers, but many upload forms reject the .jfif extension	Current Chrome, Edge, Firefox and Safari 16+; fewer editing apps
こんな方に最適	JPGにできないことは何もない — 同じ画像データを保持している	the smallest high-quality images for websites and apps
主な欠点	upload forms and some apps reject the .jfif extension	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 JFIF for nothing a JPG can't do — it holds the same image data; choose AVIF for the smallest high-quality images for websites and apps.

Frequently asked questions

How do I convert JFIF to AVIF?: Upload your JFIF 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 JFIF 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.
JFIF or AVIF: which should I use?: Use JFIF for nothing a JPG can't do — it holds the same image data. 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.
JFIFファイルとは？: A .jfif file is a JPEG with an unusual extension; Windows and some browsers save web images this way. The picture is identical to a .jpg, but many sites and apps refuse the .jfif name.
Is the JFIF 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.

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

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設定リファレンス

JFIF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）。