How to use it
- Drop your BMP files here.
- Set the JPG quality (90% by default) and, if needed, the color for transparent areas.
- Convert, then download the JPG or a ZIP of all files.
Why convert BMP to JPG?
BMP is the old Windows bitmap format. Classic Paint, some scanners, lab instruments and industrial cameras still save it. Most BMP files are not compressed at all, so the size is simply width × height × 3 bytes for a 24-bit image. A 1920 × 1080 screenshot is about 6.2 MB as BMP; as a 90% JPG it is usually a few hundred KB.
Converting BMP to JPG makes the file practical for email, upload forms and phones. The JPG is encoded with MozJPEG, which typically produces smaller files than a browser's built-in encoder at the same quality.
How it works and what to watch
Your bitmaps are decoded and converted in your browser, so nothing is uploaded. One file downloads straight away; several come as one ZIP, and each can also be saved on its own. A before/after slider lets you compare the result.
- Photos and scans: JPG is the right target.
- Screenshots, diagrams, pixel art: JPG can blur sharp edges and text. Use BMP to PNG instead, which stays lossless.
- Transparency: rare in BMP, but JPG cannot store it, so transparent areas get a background color you pick (white by default).
- Still too big? Run the JPG through Compress image with a target size.
Frequently asked questions
How much smaller will the JPG be?
For an uncompressed BMP, often a tenth of the size or less. The exact ratio depends on the picture and the quality you choose.
Does converting BMP to JPEG lose quality?
JPG is lossy, but at 85–90% the difference is not visible in photos. For crisp text or line art, convert to PNG instead.
Are my files uploaded?
No. The conversion runs entirely in your browser and your images stay on your device.
Last updated: November 13, 2026