How do I convert ICO to BMP?

Upload your ICO file above. It is converted to BMP 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 BMP lose quality?

No. Both formats are lossless, so every pixel is kept exactly.

Will the BMP keep the transparent background?

いいえ。BMPは透過を保存できないため、透明な部分は「設定」で選んだ背景色（既定は白）で塗りつぶされます。

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 BMP 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 BMP — Uncompressed Bitmaps

Convert ICO to BMP online for an uncompressed bitmap that older apps can read. No software to install. Preview one free or batch-convert with Premium.

Drop your ICO file or click to browse

Why convert ICO to BMP?

BMP is made for older Windows programs, embedded devices and tools that need raw pixels.
BMP needs no decoding, so very simple or older software can display it.

What to expect when converting ICO to BMP

BMPは透過を保存できないため、透明な部分は「設定」で選んだ背景色（既定は白）で塗りつぶされます。
元のICOファイルは変更されません。新しいBMPのコピーをダウンロードします。

ICOとBMPの比較

機能	ICO	BMP
氏名	Windowsアイコン	Windowsビットマップ
由来	Created by Microsoft for Windows icons	Created by Microsoft for Windows
圧縮	Lossless images at several sizes	非圧縮
透過	Yes — smooth, partial transparency	No (in the 24-bit BMPs most apps read)
アニメーション	いいえ	いいえ
色	透過対応のフルカラー	1,670万色（24ビット）
開けるアプリ	Browsers (as favicon.ico), Windows and icon editors	Windows and macOS apps, older software and browsers
こんな方に最適	website favicons and Windows app or shortcut icons	older Windows programs, embedded devices and tools that need raw pixels
主な欠点	icons are square and at most 256 × 256 pixels	very large files and no transparency

In short: choose ICO for website favicons and Windows app or shortcut icons; choose BMP for older Windows programs, embedded devices and tools that need raw pixels.

Frequently asked questions

How do I convert ICO to BMP?: Upload your ICO file above. It is converted to BMP 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 BMP lose quality?: No. Both formats are lossless, so every pixel is kept exactly.
Will the BMP keep the transparent background?: いいえ。BMPは透過を保存できないため、透明な部分は「設定」で選んだ背景色（既定は白）で塗りつぶされます。
ICO or BMP: which should I use?: Use ICO for website favicons and Windows app or shortcut icons. Use BMP for older Windows programs, embedded devices and tools that need raw pixels. Keep in mind the main drawback of BMP: very large files and no transparency.
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 BMP 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BMP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 BMP online
透明な部分を好きな背景色で塗りつぶします
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BMP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）。