Will the icon have a transparent background?

Only in the padding. BMP images carry no alpha channel, so the artwork itself stays opaque — and if it is not square, the space added to square it off is transparent. For an icon with a fully transparent background, start from a PNG version of the graphic instead.

What sizes are included in the ICO file?

FileMorf embeds the standard icon sizes — 16, 32, 48, 64, 128, and 256 pixels — up to your source image's own size, each stored as a PNG inside the .ico container. Browsers and Windows then pick the crispest match for wherever the icon appears: browser tabs, bookmarks, taskbars, or desktop shortcuts. Start from a source of 256px or larger to get the full set.

Will the .ico file work as a favicon everywhere?

Yes. FileMorf writes PNG-compressed ICO, the modern variant supported by every current browser and by Windows since Vista. Drop it in your site root as favicon.ico or reference it with a tag.

What if my image isn't square?

Icons are square by definition, so non-square images are scaled to fit and centered on a transparent square canvas — nothing is cropped or stretched. For the cleanest favicon, start from a roughly square logo or mark.

Favicon Generator

Convert BMP to ICO

Convert a BMP image into a proper multi-size .ico file for favicons, shortcuts, and Windows applications.

This conversion runs in this browser tab. The selected file is not uploaded for processing.

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BMPICO

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BMP to ICO, step by step.

These steps describe the BMP input and the ICO export for this exact route.

Upload BMP Files

Drag and drop your BMP images or click to browse. You can queue several files at once.

Click Convert

Conversion runs instantly in your browser — nothing is uploaded.

Download ICO

Save the converted file right away. Multiple images are bundled into a ZIP for one-click download.

What to expect

What matters for ICO output.

Review the behavior this BMP to ICO tool is designed to preserve, expose, or simplify.

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All processing happens in your browser. Your files never leave your device.

Multi-Size Icon File

One .ico bundles 16 to 256 px renditions as embedded PNGs, so browsers and Windows always pick a crisp size.

Batch Processing

Convert multiple files at once. Download as a convenient ZIP file.

Questions about BMP and ICO.

Check the format behavior, limitations, and follow-up options before processing a real file.

BMP was once the raw material for Windows icons, but a bare bitmap is not an icon file — Windows and browsers want a real .ico container with multiple embedded sizes. FileMorf renders your BMP at the standard 16-256px icon sizes and packs them into one PNG-compressed .ico. Since BMP has no transparency, the icon will be fully opaque; a square source produces the cleanest result.

Related routes

Continue from ICO.

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BMP to JPG BMP to PNG JPG to ICO Browse all conversions

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