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BMP to PNG Converter
Convert uncompressed BMP bitmaps to lossless PNG directly in your browser: the same pixels in a far smaller file. Nothing is uploaded. No sign-up, no limits, free.
Drop your BMP files here
or click to browse, or paste from your clipboard
Runs 100% in your browser No size or file limits Free, no sign-up
How to convert BMP to PNG
Add your BMP files
Drag and drop bitmaps anywhere in the box, click to browse, or paste them from your clipboard. Large files are fine because nothing is uploaded.
Choose an optimization level
PNG output is always lossless. The optimization setting only decides how hard the encoder works to squeeze the file; balanced is a good default.
Convert and download
Click Convert. Files are processed on your own device, then download PNGs one by one or all together as a ZIP.
BMP to PNG questions, answered
Is BMP to PNG really lossless?
Yes. PNG compresses without discarding anything, so the PNG contains exactly the same pixels as the BMP. It is the safe conversion when you cannot afford any quality change at all.
How much smaller does the PNG get?
It depends on content. Screenshots, diagrams and scans with flat areas often shrink by 80 to 95%, while noisy photographs compress less. If the file is a photo and small size matters more than perfect pixels, BMP to JPG shrinks it much further.
When should I pick PNG over JPG for a BMP?
Pick PNG for screenshots, text, line art, UI captures and anything you will keep editing: it keeps hard edges crisp and never adds compression artifacts. Pick JPG for photographs where a much smaller file is worth an invisible quality trade.
Does the conversion keep transparency?
BMP files with an alpha channel are rare, but if yours has one, the transparency carries into the PNG unchanged. Standard opaque bitmaps simply stay opaque.
Why do programs still produce BMP files?
BMP is the native Windows bitmap format, trivially easy for software to write, so scanners, screen-capture tools and legacy applications still emit it. It just stores every pixel raw, which modern formats avoid.
Are my files uploaded to a server?
No. Conversion runs entirely inside your browser, so even massive bitmaps convert instantly with no upload and no privacy question.