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BMP is a relic of early Windows — uncompressed, with no consideration for file size. A 1920×1080 BMP file is around 6 MB; the same image as JPG at high quality sits under 500 KB. Converting to JPG makes BMP photos and screenshots practical to store, share, or upload.
BMP files are still produced by some Windows screenshot tools, legacy software, and certain industrial or medical imaging systems — which is why the conversion remains useful.
BMP stores raw pixel data: every pixel gets its RGB values written out in sequence, with no compression applied. It's the digital equivalent of writing out every word instead of using shorthand. For a 24-bit color image, that's 3 bytes per pixel — around 6 MB for a typical HD screenshot. JPEG compression, by contrast, identifies patterns and redundancy in the pixel data and represents them compactly, which is why the size difference is so dramatic.
BMP is lossless and uncompressed, so your source has maximum quality. JPG quality 85 preserves essentially all visible detail while cutting the file to roughly 8–12% of the BMP size. If the BMP is a photograph, that's a reasonable default. If it contains text, UI elements, or line art with hard edges, bumping quality to 90–95 reduces JPEG blocking around crisp edges — though for those content types, PNG might actually be a better target than JPG.
At high quality settings (85+), detail loss is minimal for photos. Text and sharp geometric shapes show JPEG artifacts more readily — consider PNG output for those.
Typically 85–95% smaller. A 6 MB BMP photo often compresses to 300–600 KB as JPG at quality 85, depending on image complexity.
Yes. Upload up to 200 BMP files at once, up to 80 MB each, and download the JPGs as a ZIP.
Most BMP files don't use transparency. If your BMP has an alpha channel (uncommon), converting to JPG will flatten it onto a white background.