Convert ICO to BMP Online — Free
Runs 100% in your browser — your files never leave your device.
When the target is a legacy pipeline that wants bitmaps, this bridges the gap: the largest icon is extracted from the ICO container and written out as a 24-bit BMP. Decoding and encoding run locally in your browser.
How it works
- 1
Drop your ICO file
Drag an ICO into the box, or click to browse. Nothing is uploaded.
- 2
Convert to BMP
The largest embedded icon is extracted and written as a bitmap.
- 3
Download the result
Save the BMP with one click, or drop another icon to convert.
About this tool
Converting ICO to BMP
A ICO file ico is the windows icon container: a single file holding the same image at several sizes so icons render crisply at every scale. BMP bmp stores pixels essentially uncompressed — enormous files, zero quality loss, and roots deep in legacy windows software that only accepts it.. Converting moves your image from the first set of trade-offs to the second: expect the file to grow substantially, transparency is lost, because BMP cannot carry it, and pixel data is re-mapped to the target format exactly.
What to check after converting
Open the result and check the two things conversion can change: transparency and size. Your ICO source supported transparency, which BMP cannot carry — transparent areas typically fill with white or black, so design around a solid background if that matters. Your original file stays untouched on your device either way, and the download is a brand-new file.
Frequently asked questions
Is this conversion lossless?
Yes — both ICO and BMP store pixels losslessly, so the conversion moves your image between formats without touching a single value. The file size changes; the pixels do not.
Is my image uploaded anywhere?
No — the conversion runs entirely in your browser. The image is processed on your device and never sent to any server, which you can verify by disconnecting after the page loads.
Why convert ICO to BMP instead of the other way around?
The direction follows what the destination needs: legacy Windows compatibility versus Windows icons and favicons. Converting back is always available — but each lossy hop re-encodes the image, so keep the highest-quality format as your working copy and convert toward the destination.