Convert BMP to PNG
Convert BMP to PNG free in your browser. No upload, no signup, no watermark. Files stay on your device.
drop a .bmp file
or click to browse
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guide
how to convert bmp to png
Drop your BMP file
Drag your BMP file into the drop zone above, or click the box to pick a file from your computer or phone. The browser reads the file directly — nothing uploads.
Click Convert
The page runs Canvas API on your device to decode the Windows Bitmap and encode it as Portable Network Graphics. Most conversions finish in a few seconds; large or codec-heavy files (RAW, video) can take longer.
Download the PNG file
When the conversion finishes, the PNG file is ready to download. Save it anywhere on your device.
FAQ
common questions
Will my BMP file lose quality when converted to PNG?
Quality is preserved at the data level — the converter unpacks Windows Bitmap and re-stores the same content as Portable Network Graphics. Any quality differences come from the encoders inside each container, not from the conversion itself.
What happens to transparency when converting BMP to PNG?
Portable Network Graphics supports an alpha channel, but Windows Bitmap doesn't carry one — there's no transparency information in your BMP for the PNG to preserve. The output will be fully opaque unless you add transparency later in an editor.
Will the PNG file be smaller or larger than my BMP?
Usually a little smaller. Portable Network Graphics typically achieves better compression than Windows Bitmap on equivalent content.
When does it make sense to convert BMP to PNG?
Common reasons: BMP is huge file sizes (a 4K image can be 30+ MB), while PNG is lossless — saving and re-saving never degrades quality. Converting also matters when the app, device, or platform you're sharing with prefers Portable Network Graphics — every image viewer, browser, and graphics tool.
Where will my PNG file open after conversion?
Every image viewer, browser, and graphics tool. Portable Network Graphics is widely enough supported that you can hand the output file to most modern apps and expect them to render it.
Does this site upload my BMP files anywhere?
No. The whole conversion runs in your browser using Canvas API. The file you drop in never leaves your device — we don't see it, and we couldn't even if we wanted to.
Is there a file size limit for BMP to PNG?
There's no hard cap — limit is your device's memory. Several hundred megabytes works fine on a typical laptop. Phones and low-RAM machines may struggle with very large files.
Does BMP to PNG work offline?
Once this page has loaded, yes. The converter library lives in your browser and runs without any further network calls. Reloading the page does still need connectivity.