Convert BMP to PNG
Drop BMP files and download them as PNG. PNG supports transparency but BMP files have none, so the output is fully opaque; use the crop or background tools if you need cut-outs. Conversion runs on your device, so large batches finish in seconds and nothing is uploaded.
How to use the BMP to PNG
- Drop or paste your BMP files (up to 200).
- No settings needed: the output is lossless.
- Click Convert to PNG.
- Download each file or all as a ZIP.
Why convert BMP to PNG?
BMP is the uncompressed Windows bitmap format. Files are very large (3 bytes per pixel) but trivially simple, which is why some legacy software, embedded systems and wallpaper settings still require it.
PNG is lossless and supports full transparency, which makes it the standard for logos, screenshots, diagrams and anything with sharp edges or text. Photos saved as PNG are large.
What changes in the conversion
Both formats are lossless; the image is preserved exactly and only the container changes. PNG supports transparency but BMP files have none, so the output is fully opaque; use the crop or background tools if you need cut-outs.
BMP vs PNG at a glance
| BMP | PNG | |
|---|---|---|
| Compression | lossless | lossless |
| Transparency | no | yes |
| Animation | no | no |
| Typical size | very large | large for photos, small for flat graphics |
| Opens in | Windows and most editors | everywhere |
How it works on your device
Your browser decodes the BMP file into raw pixels, draws them onto a canvas and asks its built-in encoder to write PNG. Nothing is sent to a server, which is why there is no file-size limit beyond your device's memory and no queue.
Need a different pair? See all image converters or use the general converter.
Frequently asked questions
Does converting BMP to PNG lose quality?
Both formats are lossless; the image is preserved exactly and only the container changes..
Is there a limit on file size or number of files?
Up to 200 files per batch and no fixed size limit; processing happens in your browser.
Are my images uploaded?
No. The conversion runs on your device and works offline after the page loads.
Privacy
This tool runs entirely inside your browser using WebAssembly and the Canvas/File APIs. Your files are never uploaded to ToolFlint or any third party; you can verify this in your browser's network tab or by switching to airplane mode after the page loads. Read how we process files.
Last updated 2026-09-23.