Going from zero compression to lossy compression in a single move routinely cuts a photographic bitmap by a factor of fifty or more.
BMP to JPEG converter
Turn a six-megabyte bitmap into a file you can actually email — the largest size drop of any conversion here.
- Free, no signup
- Runs in your browser
- Nothing uploaded
- JPEG is lossy and BMP is not — this conversion discards detail permanently. Keep the original if it matters.
- JPEG stores no transparency. Most bitmaps are fully opaque, but a 32-bit BMP carrying alpha is flattened onto the fill colour below.
- If the bitmap is a screenshot or a diagram rather than a photo, PNG is the better destination.
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Why this conversion
When BMP to JPEG is the right move
This pairing takes an image from no compression at all to aggressive lossy compression in one step, which makes it the biggest single size reduction on this site. A photographic BMP shrinking by fifty times or more is entirely ordinary, because the starting point stores every pixel literally and the destination stores an approximation tuned to how human vision actually works.
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Whether it is the right conversion depends on what the bitmap contains. If it is a photograph or a scan of one, JPEG is well matched to the content. If it is a screenshot, a diagram or scanned text — which describes a great many BMPs — JPEG will leave visible ringing around every edge, and converting to PNG instead gives you a lossless result that is still enormously smaller than the BMP.
Reach for it when
- The bitmap is a photograph or a photographic scan.
- The file has to fit an email or upload limit.
- You have the original elsewhere and this copy is for sharing, not for archiving.
The trade-off
What you gain and lose going BMP to JPEG
BMP is lossless; JPEG is not. Once converted, the discarded detail is gone. Keep the bitmap if it is the only copy of anything that matters.
JPEG's block compression mangles hard edges and text. For non-photographic bitmaps, PNG is both better looking and often smaller.
How it works
Converting BMP to JPEG, step by step
1Choose your BMP file
Browse or drop it onto the panel. Up to 25 MB. The file is decoded by your browser and is never uploaded anywhere.
2JPEG is already selected
The target is preset to JPEG for this conversion. Only formats your browser can genuinely encode are offered, so nothing hands you a renamed PNG.
3Set quality and background
JPEG is lossy and cannot store transparency, so the dial trades size against detail and the colour picker decides what fills any transparent areas.
4Compare, then download
Original size, converted size and the percentage difference are all shown before you commit — including the cases where converting makes the file bigger.
BMP to JPEG questions
Pick a question to see the answer.
For a photographic bitmap, commonly fifty times or more. BMP stores every pixel uncompressed, so almost all of the file is redundancy that a lossy encoder removes immediately.
JPEG for photographs, PNG for anything with text, sharp edges or flat colour. PNG is lossless and still shrinks a bitmap enormously, so there is rarely a reason to accept JPEG artefacts on non-photographic content.
At the default quality, not noticeably on a photograph. Below roughly 60 percent, block structure starts to appear in flat areas such as skies. The comparison below shows the size at each setting so you can find the point where it stops being worth it.
Related conversions
Other formats, same converter
BMP to PNG
Shrink a raw bitmap with nothing lost at all.
BMP to WebPTake a legacy bitmap straight to the format the web actually wants.
PNG to JPEGShrink a screenshot or photo for an upload form that will not take a PNG.
Every format in one toolThe general image converter, with all the formats your browser can write and the same size comparison before you download.
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