Convert BMP bitmap images to JPG to dramatically reduce file size. BMP files are uncompressed and very large — converting to JPG at quality 85 reduces file size by 90%+ with minimal quality loss. Batch up to 10 files.
Click or drag up to 10 BMP bitmap images. BMP files are typically 3–30× larger than equivalent JPG files because they store every pixel uncompressed.
Quality 85 gives excellent results with ~90% file size reduction. BMP files may include transparent regions — choose a background colour to fill these (default white) since JPG does not support transparency.
Each card shows original BMP size vs output JPG size and the percentage saving. Download all at once for bulk conversion.
BMP (Bitmap) stores every pixel as raw colour data with no compression. A 1920×1080 BMP at 24-bit colour = 1920 × 1080 × 3 bytes = 5.93 MB. The same image as JPG at quality 85 is typically 300–600 KB — a 10–20× reduction. BMP was developed by Microsoft for Windows in 1987 and remains in use for system graphics, icons, and applications that require uncompressed pixel data.
Keep BMP when: the image will be processed by software that requires uncompressed pixel data, you need lossless storage without PNG overhead, you are working with Windows system graphics or device drivers, or the image will undergo many edit-save cycles and you want to avoid accumulating JPG compression artefacts. For web and sharing, always convert to JPG or PNG.
BMP has limited transparency support through 32-bit ARGB mode (the 4th channel is alpha). However, most BMP files are 24-bit (no alpha). JPG does not support transparency — any transparent pixels are filled with the background colour you choose. If transparency is essential, convert to PNG instead.
At quality 90+, JPG looks virtually identical to BMP for photographs. For images with sharp edges, solid colours, or text, JPG compression may introduce slight blurring around edges (ringing artefacts). For pixel-perfect lossless conversion, use JPG to PNG instead.
The browser Canvas API processes BMP files up to the browser memory limit, typically handling files up to 50–100 MB. Very large BMP files (100MP+ images) may cause memory warnings on low-RAM devices. Most practical BMP files (under 50 MB) convert reliably in all modern browsers.
This tool handles up to 10 files per batch — reload the page to process the next batch. For converting hundreds or thousands of BMP files, command-line tools like ImageMagick (mogrify -format jpg -quality 85 *.bmp) or IrfanView batch conversion are more practical.
