BMP to PNG Converter Online
Cut bitmap file size by 60 to 80% without altering a single pixel.
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JPG, PNG, WebP, BMP · Multiple files supported
How to Convert BMP to PNG?
Nothing is uploaded. The bmp file is decoded and re-encoded as png inside this tab.
Add your BMP files
Drag them in or use Choose Files. Batches are fine.
PNG is already selected
PNG is lossless, so the quality slider is inactive. The output is pixel-for-pixel identical to the source bitmap.
Convert and download
Everything runs locally, so the png file saves straight to your device.
Why Convert BMP to PNG?
PNG's lossless compression reduces BMP file size by 60, 80% while preserving every pixel exactly. Use BMP to PNG when you need a lossless result with a much more practical file size, and full support in all modern applications.
About BMP
BMP stores image data without any compression. This preserves perfect quality but produces enormous files. BMP is used by some legacy Windows software and industrial applications.
About PNG
PNG compresses image data losslessly, no pixel information is lost, but file sizes are dramatically smaller than BMP. PNG is universally supported and is the standard lossless format in all modern software and browsers.
What Happens to Transparency
Standard 24-bit BMP files carry no alpha channel, so the resulting PNG is opaque. PNG can store transparency, there is simply none in the source to carry across.
File Size: What to Expect
Typically 60 to 80% smaller than the BMP with every pixel preserved exactly. Screenshots, diagrams and flat-colour images compress hardest, sometimes by well over 90%. Photographic bitmaps save the least.
When Not to Convert BMP to PNG
If the bitmap is a photograph and file size is your priority, JPG or WebP will be far smaller than PNG. Choose PNG when you need the result to stay pixel-for-pixel identical to the original.
How the Conversion Works
The bitmap is decoded and re-encoded through PNG's DEFLATE filter chain. Both formats are lossless, so the pixel data comes out bit-for-bit identical, you are simply storing it far more efficiently.
Other BMP and PNG Conversions
Every pairing runs on the same browser-based converter.
Need a pairing that is not listed? The full image converter covers every combination of JPG, PNG, WebP and BMP.
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Frequently Asked Questions
Common questions about converting BMP to PNG online.
Why convert BMP to PNG?
PNG's lossless compression reduces BMP file size by 60, 80% while preserving every pixel exactly. Use BMP to PNG when you need a lossless result with a much more practical file size, and full support in all modern applications.
What happens to transparency when converting BMP to PNG?
Standard 24-bit BMP files carry no alpha channel, so the resulting PNG is opaque. PNG can store transparency, there is simply none in the source to carry across.
How much will the file size change?
Typically 60 to 80% smaller than the BMP with every pixel preserved exactly. Screenshots, diagrams and flat-colour images compress hardest, sometimes by well over 90%. Photographic bitmaps save the least.
When should I not convert BMP to PNG?
If the bitmap is a photograph and file size is your priority, JPG or WebP will be far smaller than PNG. Choose PNG when you need the result to stay pixel-for-pixel identical to the original.
Is BMP to PNG lossless?
Completely. Both formats store exact pixel values, so the PNG is pixel-for-pixel identical to the BMP while taking up a fraction of the space.
Should I pick PNG or JPG for my bitmap?
PNG if you need an exact copy, or if the image contains text, UI or line art. JPG if it is a photograph and you want the smallest possible file.
Are my BMP images uploaded to a server?
No. The conversion runs entirely in your browser. Your BMP files never leave your device and are never sent anywhere.