Convert PNG to BMP — Free & Private

Is any quality lost when converting PNG to BMP?

No — both PNG and BMP store pixel data without compression artifacts, so every pixel from the PNG carries over exactly to the BMP. The conversion is a pure container change: no detail is added or removed, and the pixels are bit-for-bit identical. The only thing that changes is how the file is stored on disk.

• Lossless to lossless: zero quality loss — pixels are identical
• The conversion is reversible — converting back to PNG loses nothing further
• Colour accuracy and detail are fully preserved
• File size changes due to different storage methods, not image quality

Why is the BMP file so much larger than the PNG?

PNG compresses pixel data losslessly, so it's already fairly compact for a lossless format. BMP, by contrast, is essentially uncompressed — every pixel is written out at full size regardless of how repetitive the image is. Converting PNG to BMP typically increases the file size by 10-20x, even though the BMP contains no more visual information than the PNG did.

• PNG: compressed losslessly — already reasonably compact
• BMP: uncompressed — expect roughly 10-20x larger files
• The size increase reflects BMP's lack of compression, not added image data
• If file size matters, keep the PNG or convert to WebP instead of BMP

Will my PNG's transparency carry over to the BMP?

Probably not in any usable way. PNG supports a full alpha channel, so transparent and semi-transparent areas are stored reliably. BMP's situation is different — while a 32-bit BMP variant can technically include an alpha channel, support for it is unreliable across image viewers and software, so most BMP files are treated as fully opaque. Transparent areas in the PNG often become a solid colour, frequently white, in the converted BMP.

• PNG transparency is reliable; BMP transparency support is inconsistent
• Expect transparent PNG areas to become a solid colour in the BMP
• If you need to keep transparency, keep the PNG or convert to WebP instead
• Check the converted image if your PNG had transparent or semi-transparent areas

When would I actually need to convert PNG to BMP?

Almost always for software compatibility — some older Windows applications, embedded systems, thermal printers, or specialised industrial and scientific tools accept BMP but not PNG. For everyday sharing, editing, or web use, keeping the PNG or converting to WebP makes far more sense.

• BMP: legacy Windows applications, embedded systems, some thermal/label printers
• For web/sharing: PNG or WebP are smaller and more broadly useful
• Keep your original PNG as the working file unless BMP is specifically required
• Don't convert to BMP "for quality" — it won't improve anything over the PNG