Why is my BMP file so huge?

BMP stores every pixel with no compression. JPG compresses intelligently, so the same image becomes a tiny fraction of the size.

Will the JPG look different?

At high quality the difference is hard to see, while the file becomes vastly smaller and easier to share or upload.

Why would I choose PNG instead of JPG for a BMP?

When the image is a diagram, a screenshot of text or pixel art. PNG is lossless, keeps hard edges perfectly and is still many times smaller than BMP. JPG is the better choice for photographs and scans of photos.

Does converting BMP to JPG reduce the resolution?

No. The pixel width and height stay the same; only the way the pixels are stored changes. The size drop comes from JPG compression, not from shrinking the image.

Convert BMP to JPG

Turn large BMP bitmaps into compact, universal JPG files — free, in your browser.

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processed on your device — never uploaded

BMP is the format Windows has used since the 1990s: Paint saves to it, old scanners produce it, and screenshots on some legacy systems still land in it. It stores every pixel with no compression at all, which is why a modest 1920 by 1080 image is about 6 MB and a scanned A4 page at 300 DPI can pass 25 MB. Nothing on the web wants that. Converting to JPG turns the same picture into a file a few hundred kilobytes in size that opens on every phone, browser and site.

Your browser can open BMP natively, so this page simply reads the bitmap and re-encodes it as JPG on your device, with no upload involved. Pick JPG as the output and download. For photographs and scans the result looks the same at a glance and is dramatically smaller.

Two honest points. JPG is lossy, so this is a one-way trip; keep the BMP if it is a master scan you might need to reprocess. And for images that are mostly flat colour or hard edges, such as old pixel art, diagrams or screenshots of text, JPG adds faint artefacts around the edges, so PNG is the better target; it is also lossless and still a fraction of the BMP's size.

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Frequently asked questions

Why is my BMP file so huge?: BMP stores every pixel with no compression. JPG compresses intelligently, so the same image becomes a tiny fraction of the size.
Will the JPG look different?: At high quality the difference is hard to see, while the file becomes vastly smaller and easier to share or upload.
Why would I choose PNG instead of JPG for a BMP?: When the image is a diagram, a screenshot of text or pixel art. PNG is lossless, keeps hard edges perfectly and is still many times smaller than BMP. JPG is the better choice for photographs and scans of photos.
Does converting BMP to JPG reduce the resolution?: No. The pixel width and height stay the same; only the way the pixels are stored changes. The size drop comes from JPG compression, not from shrinking the image.

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🔒 Your files are processed on your device. This tool runs entirely in your browser — nothing is uploaded.