How do I convert BMP to AVIF?

Upload your BMP 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 BMP 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.

BMP or AVIF: which should I use?

Use BMP for older Windows programs, embedded devices and tools that need raw pixels. 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.

BMPファイルとは？

BMPはピクセルをまったく圧縮せずに保存します。ファイルは大きくなりますが、最新の形式を読み込めない非常に古いソフトや簡易なソフトでも、たいていBMPなら読み込めます。

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

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

Drop your BMP file or click to browse

Why convert BMP to AVIF?

AVIF files are usually smaller than BMP 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 BMP to AVIF

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

BMPとAVIFの比較

機能	BMP	AVIF
氏名	Windowsビットマップ	AV1 Image File Format
由来	Created by Microsoft for Windows	Released by the Alliance for Open Media in 2019
圧縮	非圧縮	非可逆または可逆
透過	No (in the 24-bit BMPs most apps read)	Yes — smooth, partial transparency
アニメーション	いいえ	はい
色	1,670万色（24ビット）	8, 10 or 12 bits per channel, including HDR
開けるアプリ	Windows and macOS apps, older software and browsers	Current Chrome, Edge, Firefox and Safari 16+; fewer editing apps
こんな方に最適	older Windows programs, embedded devices and tools that need raw pixels	the smallest high-quality images for websites and apps
主な欠点	very large files and no transparency	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 BMP for older Windows programs, embedded devices and tools that need raw pixels; choose AVIF for the smallest high-quality images for websites and apps.

Frequently asked questions

How do I convert BMP to AVIF?: Upload your BMP 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 BMP 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.
BMP or AVIF: which should I use?: Use BMP for older Windows programs, embedded devices and tools that need raw pixels. 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.
BMPファイルとは？: BMPはピクセルをまったく圧縮せずに保存します。ファイルは大きくなりますが、最新の形式を読み込めない非常に古いソフトや簡易なソフトでも、たいていBMPなら読み込めます。
Is the BMP 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.

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

BMP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）。