What happens to the icon's transparency mask?

It's discarded — BMP output flattens the icon onto a solid background. Classic ICOs actually store their imagery as a bitmap plus a separate 1-bit mask; the conversion hands you the color bitmap portion with the masked areas filled in.

Which programs can edit the result?

Practically everything ever shipped for Windows — MS Paint, ancient resource editors, and every image tool since the early 1990s open BMP natively. That universality is the whole reason to extract into such an old format.

Why does the extracted image look so blocky?

Because icons are genuinely tiny — a 32-pixel source is 32 pixels no matter the container. Zoom in while editing rather than resizing the file; scaling a bitmap up multiplies the blockiness instead of adding detail.

ICO to BMP Converter – Free & Online

Convert ICO to BMP

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Old-school icon editors work in bitmaps, so extracting an ICO's image to BMP puts favicon or app-icon artwork back into raw editable pixel form. Internally ICO already stores bitmap data, which makes this one of the most faithful icon conversions.

Convert ICO to BMP – Free Online ICO to BMP Converter

Why convert ICO to BMP?

Edit icon pixels in classic tools — MS Paint, legacy resource editors — that read BMP natively.
Recover graphics from .ico resources when rebuilding or reverse-engineering old Windows apps.
Produce a plain bitmap for firmware or test rigs from existing icon assets.

Tip: BMP drops the icon's transparency mask, so cutout areas fill with a solid color — note which background you'll composite on before editing.

How to convert ICO to BMP

Upload your ICO file using the area above.
BMP is preselected as the target format.
Click Start and wait for the conversion to finish.
Download your converted BMP file.

Convert ICO to BMP

Convert ICO to BMP – Free Online ICO to BMP Converter

Why convert ICO to BMP?

How to convert ICO to BMP

ICO to BMP — Frequently Asked Questions