BMP to PNG Converter
Bitmaps are enormous for what they contain. Convert them to PNG here — the same pixels, losslessly, usually at a fraction of the size.
Select BMP images
or drop images here
BMP files · Up to 100 images · 100 MB each
Conversion runs locally in your browser. Your images are not uploaded.
- Original
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- PNG
- —
- Output dimensions
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SVG output dimensions
The aspect ratio stays locked. Changing one side updates the other.
The one conversion that reliably shrinks the file
Most format conversions make a file bigger. This one does the opposite: a BMP normally stores each pixel raw with no compression at all, so a 1920×1080 bitmap occupies about 6 MB whatever it depicts. PNG stores the identical pixels with lossless compression and commonly lands under a tenth of that. Nothing is approximated — the picture is unchanged, only stored sensibly.
Where BMP files still come from
Windows utilities, older scanner drivers, screenshots from legacy software and some industrial and medical equipment still write BMP. They open on Windows and little else, which is why moving them to PNG makes them shareable without changing a pixel.
Transparency and colour tables
Most BMP files are fully opaque, and those convert to opaque PNGs. Palette-based bitmaps — 8-bit, 4-bit or monochrome — are converted with their colours intact. The rare 32-bit BMP carrying an alpha channel keeps its transparency.
How to convert BMP to PNG
- Select images or drop your BMP files into the workspace.
- Each file converts automatically at its original size.
- Open a row to see the original size next to the PNG size.
- Download a single PNG, or the batch as one ZIP.
BMP to PNG questions
Will the image look different?
No. Both formats are lossless, so the PNG holds exactly the same pixels as the BMP.
How much smaller will the file be?
It depends on the picture. Screenshots, diagrams and anything with flat colour often compress to well under a tenth of the BMP. Photographic content compresses less, but still shrinks considerably.
Are the dimensions changed?
No. Pixel width and height are preserved.
Does a transparent BMP stay transparent?
A 32-bit BMP with an alpha channel keeps it. Most bitmaps have no transparency to begin with and convert as fully opaque images.
How many files can I convert at once?
Up to 100 per batch, each up to 100 MB.
Is anything sent to a server?
No. Conversion and the ZIP both happen in this browser tab.