Why are BMP files so large?

BMP is typically uncompressed — it stores the full color value of every single pixel with no compression. A 4000×3000 image can be over 35MB. JPG applies efficient compression, which is why the same image becomes a fraction of the size.

How much smaller will the JPG be?

Usually 90–98% smaller. A 30MB BMP commonly becomes a 1–3MB JPG with no visible difference.

Will I lose quality converting BMP to JPG?

JPG is lossy, but at quality 92 the difference is invisible for photographic content. The only place you might notice it is around very sharp, high-contrast edges or text — for those, PNG is a better target.

What is a BMP file used for?

BMP is a legacy Windows bitmap format, still produced by some older software, scanners, and Windows utilities. Because it is uncompressed and poorly supported online, converting to JPG (or PNG) is almost always worthwhile.

Are my files uploaded to a server?

No. Conversion runs 100% in your browser. Files never leave your device.

Does BMP transparency carry over?

Standard BMP files do not store transparency, so there is nothing to carry over. JPG does not support transparency either. If your source has an alpha channel, convert to PNG instead.

Can I batch convert BMP files?

Yes — up to 20 at once, downloadable as a ZIP.

What is the maximum file size?

100MB per file, which comfortably covers large uncompressed bitmaps.

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