Convert JPG to BMP — Free & Private

Does converting JPG to BMP improve the image quality?

No — BMP can't restore detail that JPG's compression already discarded. What you get is an uncompressed copy of exactly what's in the JPG: no further compression artifacts will be added, but nothing that's already missing comes back either. If better quality matters, that has to come from the original photo, not from changing the file format.

• BMP stores the JPG's pixels exactly as-is, with no further compression
• Re-saving as BMP doesn't undo any quality loss from the original JPG compression
• BMP won't degrade the image further, but it won't improve it either
• For better quality, use the original (pre-JPG) source if you still have it

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

JPG's compression is what keeps photo files small — it discards information the eye won't easily notice. BMP, by contrast, stores every pixel at full size with no compression at all. Converting from JPG to BMP commonly produces a file 10-20x larger, simply because BMP has no compression algorithm working in its favor, not because any new image data was added.

• JPG: compressed, optimized for small file sizes
• BMP: uncompressed — expect roughly 10-20x larger files
• The size increase reflects BMP's lack of compression, not added quality
• If file size matters, keep the JPG or convert to PNG/WebP instead

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

JPG has no transparency channel at all, so there's nothing to carry over — the image is fully opaque in both the JPG and the BMP. If you need a transparent version of the image, you'd have to run it through a background-removal tool first, but even then, BMP isn't a good destination: while a 32-bit BMP variant can technically store an alpha channel, support for it is unreliable across image viewers and software.

• JPG has no transparency to begin with — the BMP will be fully opaque too
• If you need transparency, use background removal first, then save as PNG or WebP, not BMP
• Most software treats BMP files as fully opaque regardless of the 32-bit alpha variant
• Never save a transparent image as JPG — transparent areas become a solid colour

When would I actually need to convert JPG to BMP?

Almost always for software compatibility — some older Windows applications, embedded systems, or specialised industrial/scientific tools accept BMP but not JPG. For everyday sharing, editing, or web use, there's rarely a reason to convert a JPG to BMP, since it only makes the file much larger without any quality benefit.

• BMP: legacy software or hardware that specifically requires it
• For web/sharing: keep the JPG, or use PNG/WebP if you need lossless storage
• Keep your original JPG as the working file unless BMP is specifically required
• Don't convert to BMP expecting better quality — it won't improve on the JPG