Convert ICO to BMP online

To convert ICO to BMP, upload the ICO file, start the conversion and download the result: Converter.now writes an uncompressed 24-bit BMP. BMP has no transparency, so transparent areas are filled with white.

◈ Encrypted transfer◷ Short retention⊘ No watermark◎ Works on every device

ICO to BMP at a glance

Converts: ICO raster image → BMP raster image
Output: An uncompressed 24-bit BMP
Compression: ICO: lossless → BMP: uncompressed
Engine: Pillow (with ImageMagick fallback)
Privacy: Private download link; files are deleted after 6 hours. No account needed.

ICO to BMP: The pixel decoding and image re-encoding route explained

A windows icon container that can hold several square pixel sizes and color depths is decoded into a working pixel canvas first, then written back out under BMP's own color and compression model. Dimensions can stay exactly the same even as encoding, metadata, and fine detail change underneath. ICO input enumerates every embedded square image, size, bit depth, PNG-or-bitmap encoding, mask, and alpha channel instead of decoding only the largest icon. BMP output writes a single flat pixel surface with an explicit row order and color depth, built for simple bitmap interchange rather than layers or multiple resolutions.

Decoded canvas - A Windows icon container that can hold several square pixel sizes and color depths. Written image - A broadly understood bitmap with straightforward pixel storage and little compression.

For related jobs, compare other ICO converters with the full list of BMP conversions.

Background reading: archival versus delivery formats covers which copy to preserve and which to share.

ICO

ICO raster image

Used for pixel-based artwork, scans, and photographs.

Family: Images
MIME: image/vnd.microsoft.icon

→

BMP

BMP raster image

Designed for pixel-based artwork, scans, and photographs.

Family: Images
MIME: image/bmp

The delivery decision for this ICO to BMP route

Choose BMP when its particular balance of compatibility, alpha, animation, and file size matches the destination better than ICO.

What changes between the ICO model and the BMP deliverable

BMP has no transparency, so transparent areas are filled with white.
Metadata handling differs between ICO and BMP; do not assume every application-specific field carries across untouched.

What the ICO source carries and the BMP output demands

What can fail when ICO raster image is interpreted

A conversion may create only one size, making the icon look soft in menus or high-density displays.

What BMP raster image cannot safely promise

BMP derivatives are often much larger than web images and may encode alpha or row order differently between apps.

How the BMP writer handles this route

The writer builds a broadly understood bitmap with straightforward pixel storage and little compression and labels the result as image/bmp. The receiving application - Not the extension alone - Is the final compatibility test.

Acceptance evidence for the converted BMP

Record the ICO evidence before conversion

Inspect the embedded sizes and preview the icon at 16, 32, 48, and 256 pixels where required.

Test the BMP file in its receiving workflow

Confirm dimensions, color depth, orientation, and whether the receiving app reads transparency.