BMP to JPG Converter — Free Online
Convert BMP to JPG for a 90%+ size drop with no visible quality loss. Uncompressed BMP means the saving is dramatic. Runs entirely in your browser.
Drop BMP files here or click to pick
Output: JPG · runs locally in your browser
90–95 is visually lossless for photos. Drop to 75–85 for the web.
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Three bytes per pixel is three bytes per pixel
A BMP stores the colour of each pixel directly — three bytes for RGB in the common 24-bit form — so the file size is predictable from the dimensions alone, before you know anything about the picture. A 1920×1080 image is roughly 1920 × 1080 × 3 bytes, or about 6.2 MB, plus a small header.
The consequence is worth pausing on, because it is the clearest illustration of what compression actually does: a blank white rectangle and a highly detailed photograph at the same dimensions occupy virtually the same space in BMP. The format spends the same bytes on nothing as on everything, because it is not looking at the content at all.
JPEG shrinks what BMP cannot
JPEG compresses based on what the eye actually notices, and a photograph of the same dimensions typically occupies a small fraction of the BMP. Reductions of 90% or more are routine.
What makes this conversion unusually painless is the state of the source. Most lossy conversions re-compress something that has already been compressed once, so the encoder wastes effort faithfully preserving existing artefacts. A BMP is pristine — you are compressing an original for the first time, and there is nothing to compound. The default quality of 92 is generous for that reason; for web use, dropping to 80–85 usually produces a much smaller file with no visible difference.
Why you probably have a BMP file
BMPs are almost always a byproduct rather than a choice: older Windows applications and screen-capture defaults, Microsoft Paint saves, and some scanner, medical and scientific imaging software that still writes BMP by default. Nobody picks BMP for its qualities. That is why converting is nearly always the right move — the file shrinks enormously and, for photographic content, you will not see the difference.
Transparency and the background colour
BMP can technically store an alpha channel in its 32-bit form, though this is uncommon and inconsistently supported by older software. JPEG has no alpha channel at all, so any transparent pixels are flattened onto a background colour, which defaults to #ffffff and is configurable. If the transparency matters, JPEG is the wrong target and you want a format that keeps alpha instead.
The browser decodes your BMP, draws it to a canvas and re-encodes it locally — nothing is uploaded, and all metadata is stripped in the re-encode.
How to use the BMP to JPG Converter
Takes about a minute. No signup, no download, your data stays in your browser.
- 1Open the tool. Scroll up to the BMP to JPG Converter above — it loads instantly in your browser, no install needed.
- 2Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
- 3Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.
Frequently asked questions
Common questions about the BMP to JPG Converter.
Why is the file so much smaller after converting BMP to JPG?
BMP stores three bytes per pixel with essentially no compression, so a 1920 by 1080 image is around 6.2 MB regardless of what it shows. JPEG compresses according to what the eye notices, often reaching a tenth of that or less. Because the BMP source is pristine rather than already compressed, the visible quality cost is close to nothing.
What quality setting should I use?
The default of 92 is generous for photographs, and the slider runs from 40 to 100. For web use, 80 to 85 is usually indistinguishable while producing a noticeably smaller file. Since a BMP has no existing compression artefacts to amplify, you can push lower here than you safely could when re-compressing a JPEG.
What happens if my BMP has transparency?
BMP can carry an alpha channel in its 32-bit form, but JPEG cannot represent transparency at all, so those pixels are flattened onto a background colour — white by default and configurable in Advanced options. If you need the transparency preserved, JPEG is the wrong target format.
What if my BMP will not open at all?
Browsers handle common BMP variants but not every exotic one, such as certain compressed or high-bit-depth subformats, and you will see an error saying the browser cannot decode the file and that it may be corrupt or use an unsupported subformat. Because that failure happens at the decoding stage, choosing a different output format will not help — re-save the BMP as a standard 24-bit file in another application first.
Is my file uploaded anywhere?
No. The browser decodes the BMP, draws it to a canvas and re-encodes it on your own device, so the image never leaves your computer. All metadata is discarded during that re-encode.
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