Convert ICO to BMP Online
Limited to Windows ecosystem conventions and max 256x256 pixels; not useful for general image work. Converting to BMP gives you a key advantage: zero processing overhead — raw pixel data can be read directly into memory without a decompression step. BMP is best for uncompressed pixel data for windows system graphics and legacy applications requiring raw bitmap access.
Why Convert ICO to BMP?
Limited to Windows ecosystem conventions and max 256x256 pixels; not useful for general image work — converting to BMP overcomes this by providing zero processing overhead — raw pixel data can be read directly into memory without a decompression step
BMP is the right choice when you need to: intermediate format for image processing pipelines that need raw pixel access
Gain broader compatibility — BMP works with Windows (native), macOS, Linux, all image editors; rarely used on the web
Your ICO files were created for designing windows application icons for desktop shortcuts, but now you need a format suited to different workflows
ICO vs BMP — Format Comparison
Windows Icon Format (.ico)
Windows Bitmap (.bmp)
How to Convert ICO to BMP
Upload your ICO file
Drag your .ico file onto the upload area or click to browse. We accept ICO files up to 5 MB.
Choose BMP as output format
Select .bmp (Windows Bitmap) from the format list. BMP uses lossless encoding, so your output quality matches the source.
Convert and download
Click Convert and wait for processing. Your BMP file will be ready to download in seconds. The result is optimized for uncompressed pixel data for windows system graphics and legacy applications requiring raw bitmap access.
Frequently Asked Questions
Is the ICO to BMP conversion lossless?
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When both formats support lossless data, the conversion preserves all content. Uncompressed pixel-perfect quality; supports 1-bit through 32-bit color depth.
How large will my BMP file be compared to the original ICO?
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ICO files are typically 1 KB – 500 KB, while BMP files are typically 1 MB – 100 MB. The actual size depends on content complexity and any quality settings you choose.
What software can open the converted BMP file?
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BMP is compatible with: Windows (native), macOS, Linux, all image editors; rarely used on the web.
What is the maximum file size I can convert?
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PureConverter accepts ICO files up to 5 MB. Your files are processed securely and deleted from our servers after conversion.
What's the difference between ICO and BMP?
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ICO (Windows Icon Format) is best for browser favicons and windows desktop icons that need multiple sizes in a single file. BMP (Windows Bitmap) is best for uncompressed pixel data for windows system graphics and legacy applications requiring raw bitmap access. Key tradeoff: ICO's advantage is stores multiple resolutions (16x16 through 256x256) in one file so the os or browser picks the best size automatically, while BMP's advantage is zero processing overhead — raw pixel data can be read directly into memory without a decompression step.
Pro Tips for ICO to BMP Conversion
BMP preserves full quality, so your output file will be as good as the ICO source — no need to worry about compression artifacts
If your ICO file has transparency, make sure BMP supports it — BMP supports transparency
BMP works especially well for: screen capture output from older windows tools and apis
Did you know? BMP files store pixel rows bottom-to-top by default (origin at bottom-left), a convention inherited from OS/2 that confused generations of graphics programmers.
Ready to Convert?
Upload your ICO file above and get your BMP in seconds. Free, fast, and secure.