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Convert BMP to JPG
A BMP came out of an old scanner, a Windows utility or a medical or industrial device, and it is enormous for what it contains.
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What actually changes
BMP and JPG are not the same picture in two wrappers.
BMP stores raw pixel rows with no compression at all. JPEG applies DCT compression, which routinely turns a 24 MB bitmap into a 1 MB file with no visible difference for photographic content.
Worth knowing first
BMP files from screen captures and scientific instruments are usually flat colour and text, which is precisely what JPEG is worst at. For those, PNG gives a smaller file and keeps the edges exact.
Questions
BMP to JPG, answered
Why are BMP files so large?
There is no compression in a standard BMP. Width times height times three or four bytes, plus row padding to a four-byte boundary, is the whole file.
Does BMP hold transparency?
Some 32-bit BMP variants carry an alpha channel, but support is inconsistent and JPEG cannot store it anyway, so any transparency ends up filled.
How to convert BMP to JPG
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Choose your settings
JPEG Image is lossy, so the quality control decides the trade between size and fidelity.
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Download
Instant, because the file never went anywhere. Nothing expires, since nothing was stored.