Use the BMP to PNG in three steps
Choose a BMP
Open the bitmap file from your device.
Decode the image
Your browser reads the BMP and prepares its pixels.
Download PNG
Save the losslessly compressed PNG copy.
Why PNG is usually smaller
Many BMP files store pixel data with little or no compression. PNG uses lossless compression, so repeated patterns and flat areas often require much less space.
Browser support can vary for unusual BMPs
Common Windows bitmap files usually decode correctly. Rare compression methods, color depths, or damaged headers may not be supported by every browser.
BMP to PNG FAQ
Does BMP to PNG lose quality?＋
No. PNG stores the decoded pixels with lossless compression.
Will the PNG always be smaller?＋
Usually, but size depends on image complexity and how the source BMP was stored.
Are image dimensions preserved?＋
Yes. The output matches the decoded BMP width and height.
Can every BMP variant be opened?＋
Browser support is strongest for common BMP formats; rare or damaged variants may fail to decode.
Does the tool convert BMP transparency?＋
If the browser exposes an alpha channel from the BMP, PNG can retain it.
Is the BMP changed or deleted?＋
No. A new PNG is downloaded and the original remains untouched.