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?

不会。BMP 无法存储透明度，因此透明区域会用您在“设置”中选择的背景色填充（默认为白色）。

什么是 ICO 文件？

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 无法存储透明度，因此透明区域会用您在“设置”中选择的背景色填充（默认为白色）。
您原来的 ICO 文件不会被更改：您下载的是一份新的 BMP 副本。

ICO 与 BMP 对比

功能	ICO	BMP
全名	Windows 图标	Windows 位图
来源	Created by Microsoft for Windows icons	Created by Microsoft for Windows
压缩	Lossless images at several sizes	未压缩
透明度	Yes — smooth, partial transparency	No (in the 24-bit BMPs most apps read)
动画	否	否
颜色	全彩并支持透明	1670 万种颜色（24 位）
可用什么打开	Browsers (as favicon.ico), Windows and icon editors	Windows and macOS apps, older software and browsers
最适合	website favicons and Windows app or shortcut icons	older Windows programs, embedded devices and tools that need raw pixels
主要缺点	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?: 不会。BMP 无法存储透明度，因此透明区域会用您在“设置”中选择的背景色填充（默认为白色）。
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.
什么是 ICO 文件？: 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.

使用 ICO 转 BMP 可以做什么

在开始之前查看主要功能。

Convert ICO files to BMP online
用您选择的背景色填充透明区域
Switch to any other output format in Settings
Batch-convert many ICO files into one ZIP
Preview the result before you download

使用这个工具

设置参考

ICO 转 BMP 的可用控件。

设置

输出格式下拉框: Chooses the file type you download. The page opens on its own output format; switch to any other format before converting.选项: JPGPNGWebPAVIFGIFTIFFBMPICOPDF
质量滑块范围: 20–100 · 默认: 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.
无损模式开／关: For WebP and AVIF output: keeps every pixel exactly (best for logos, graphics and transparency) at the cost of a larger file.
背景填充取色器: 适用于无法存储透明度的 JPG、BMP 和图片转 PDF 输出：用于填充透明区域的颜色（默认为白色）。