How do I convert BMP to ICO?

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

Each icon size is scaled down from your image and stored without further compression, so small sizes stay crisp.

BMP stores pixels with no compression at all. Files are large, but very old or simple software that can’t read modern formats can usually read a BMP.

What sizes does the ICO file include?

The standard icon sizes of 16, 32, 48, 64, 128 and 256 pixels, skipping any larger than your image. Browsers and Windows pick the best size automatically.

Is the BMP to ICO 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 ICO — Favicons and Windows Icons

Convert BMP to ICO online to make a favicon or Windows icon in several sizes. No software to install. Preview one free or batch-convert with Premium.

Drop your BMP file or click to browse

Why convert BMP to ICO?

One ICO bundles the standard 16 to 256 px icon sizes (up to the size of your image), ready for a favicon.ico or a Windows shortcut.
Browsers show the ICO as your site’s tab and bookmark icon when you save it as favicon.ico.

What to expect when converting BMP to ICO

Icons are square, so a non-square image is centred on a transparent square. Sizes larger than your image aren’t created, so start from at least 256 × 256 pixels.
Your original BMP file isn’t changed: you download a new ICO copy.

BMP vs ICO

機能	BMP	ICO
氏名	Windows Bitmap	Windows Icon
Origin	Created by Microsoft for Windows	Created by Microsoft for Windows icons
圧縮	Uncompressed	Lossless images at several sizes
Transparency	No (in the 24-bit BMPs most apps read)	Yes — smooth, partial transparency
アニメーション	いいえ	いいえ
色	16.7 million colours (24-bit)	Full colour with transparency
Where it opens	Windows and macOS apps, older software and browsers	Browsers (as favicon.ico), Windows and icon editors
こんな方に最適	older Windows programs, embedded devices and tools that need raw pixels	website favicons and Windows app or shortcut icons
Main drawback	very large files and no transparency	icons are square and at most 256 × 256 pixels

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

Frequently asked questions

How do I convert BMP to ICO?: Upload your BMP file above. It is converted to ICO 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 ICO lose quality?: Each icon size is scaled down from your image and stored without further compression, so small sizes stay crisp.
BMP or ICO: which should I use?: Use BMP for older Windows programs, embedded devices and tools that need raw pixels. Use ICO for website favicons and Windows app or shortcut icons. Keep in mind the main drawback of ICO: icons are square and at most 256 × 256 pixels.
What is a BMP file?: BMP stores pixels with no compression at all. Files are large, but very old or simple software that can’t read modern formats can usually read a BMP.
What sizes does the ICO file include?: The standard icon sizes of 16, 32, 48, 64, 128 and 256 pixels, skipping any larger than your image. Browsers and Windows pick the best size automatically.
Is the BMP to ICO 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 to ICO 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 ICO online
Bundle standard icon sizes from 16 to 256 px in one file
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 to ICO 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: For JPG, BMP and image-to-PDF output, which can’t store transparency: the colour that fills transparent areas (white by default).