BMP to JPG Converter
Convert BMP — the old Windows bitmap format — into JPG, the format everything can open. Runs entirely in your browser.
Why convert BMP to JPG?
BMP is a Windows format from an era before compression mattered, and it is still produced by scanners, capture utilities and industrial software. The files are stored essentially raw, so a modest image can run to tens of megabytes for no benefit whatsoever. JPEG is the obvious fix.
What changes when BMP becomes JPG
A dramatic size reduction. A 24-bit BMP is roughly three bytes per pixel with no compression at all, and quality 85 JPEG will typically land under a twentieth of that. Since the source was uncompressed, this is the first lossy step the image has taken, so it holds up well.
Why this one is different
Every other BMP to JPG converter uploads your files to their server, which is why they cap file sizes and ask you to sign up. This one does the work on your own machine, so it can afford not to.
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Questions
How do I convert BMP to JPG?
Drop your BMP files onto the box above and each one is converted to JPG straight away. Then download the results, individually or together as a ZIP. There is no upload step and no account.
Why are BMP files so large?
They store each pixel literally, with no compression in the common case. A 4000 by 3000 image is about 36 MB as a 24-bit BMP regardless of what it depicts.
Is quality lost?
Some, by definition — JPEG is lossy. But the source was uncompressed, so this is a single clean generation rather than a re-encode of a re-encode, and at quality 85 it is not something you will see.
Do my files get uploaded anywhere?
No. Everything happens in this tab. Your files are never sent to a server, which is why this still works if you disconnect from the network after the page has loaded.