If your picture already lives as a BMP — drawn in Paint, exported from a legacy tool, or saved by an older Windows program — the road to an icon is the shortest one there is, because ICO frames are historically bitmap-derived. This free bmp to ico converter packs your bitmap into a single .ico holding 16, 32, and 48 pixel versions for browser tabs, bookmarks, and Windows shortcuts. One limit to know: a standard BMP is opaque, so the icon gets a solid background rather than see-through edges. Everything runs in your browser, so nothing is uploaded and no signup is needed.
How to use this bmp to ico converter
Three quick steps — no signup, no cost.
Choose one .bmp file. A square bitmap works best, since icons are square; anything else is centre-cropped.
Check the 16-pixel version before downloading. Bold shapes survive; fine detail usually does not.
Save the .ico — name it favicon.ico for a website — with all three sizes inside one file.
Why a bmp to ico converter is the shortest path from a Windows bitmap to an icon
Closest source format, standard sizes, no upload.
BMP and ICO are close relatives from the same Windows family, so the pixels move across with no format friction and no quality tricks.
16 pixels for the browser tab, 32 for bookmarks and high-density tabs, 48 for Windows shortcuts — each reader picks its match.
Each size is stored as a PNG inside the ICO container, the form browsers and Windows have read since Vista.
Standard BMP has no transparency, so the icon keeps a solid background. For see-through edges, start from a transparent PNG instead.
BMP to ICO Converter FAQs
Short, direct answers to the questions readers ask most.
No. A standard BMP is opaque, so the icon gets a solid background. If you need see-through edges, convert a transparent PNG instead.
Three: 16, 32, and 48 pixels in a single .ico file — the standard favicon set.
Not for quality: the icon is resampled down to 16, 32, and 48 pixels regardless. Very large bitmaps just take a little longer to process in the browser.
Yes. Save it as favicon.ico at the root of your site, or link it with a rel=”icon” tag.
Yes. It converts in your browser with no account, no signup, and no watermark.
Related Tools
More free converters that work the same way — right in your browser.
Free favicon generator that turns your image or logo into a site icon online, with no upload.
BMP to PNG ConverterFree bmp to png converter that turns a bitmap into a compressed PNG online, with no upload and no signup.
ICO to PNG ConverterFree ico to png converter that turns an icon back into a PNG image online, with no upload.
BMP to JPG ConverterFree bmp to jpg converter that turns a bitmap into a small JPG photo file online, with no upload.
Try the related tools above, or go back to the Convertion homepage for more free converters.
