RunToolRunBMP to JPG
Convert BMP files to JPG format.
How to Convert BMP to JPG
Select your BMP files
Click the upload area or drop one or more .bmp images — batch conversion is supported.
In-browser compression
Each uncompressed BMP is re-encoded as a high-quality JPG (92%) on your device.
Download the JPGs
Save the converted images — often more than 90% smaller than the originals.
Why BMP files are enormous
A bitmap stores every pixel's colour value directly, with no compression at all. A 1920×1080 image occupies about six megabytes regardless of its content — a photograph and a plain white rectangle take exactly the same space.
That is why the format persists in narrow places, such as some Windows applications, medical and scientific imaging pipelines, and older industrial software, where predictable layout matters more than size. For everything else it is simply wasteful.
What the conversion gains
JPEG compresses by discarding detail the eye is least likely to notice, and on a photograph it reaches reductions of ninety percent or more with no visible difference. Converting a BMP photograph is the largest easy size saving available in image work.
It also converts to a format that everything opens. BMP is supported widely but not universally, and many web upload forms reject it outright.
When JPEG is the wrong destination
BMP files are frequently screenshots, diagrams, scanned line art or images with large flat areas — exactly the content JPEG handles worst. Hard edges around text develop the familiar grey fringing, and flat colour areas gain noise.
For that content, PNG compresses losslessly and produces a file that is both smaller and cleaner than any JPEG you would accept. Choose the destination by what is in the image, not by habit.
Transparency and colour depth
Some BMP variants carry an alpha channel, and JPEG has none. Transparent areas must become a solid colour, and here they become white — permanently, since JPEG cannot store the information needed to undo it.
Low colour depth is the other case. A BMP saved with 8 or 16 bits per pixel already has a reduced palette, and JPEG's compression interacts badly with the resulting banding, sometimes making it more visible rather than less.
The conversion is one-way
BMP is lossless, so the file you start with holds exactly what was captured. Once encoded as JPEG, the discarded detail is gone, and converting back to BMP produces a very large file containing JPEG artefacts stored perfectly.
Keep the BMP if it is a master copy or the output of a measurement process. Convert copies for distribution.
How it runs
Decoding and re-encoding happen in your browser using its built-in image support, so nothing is uploaded. Because BMP files are large, a batch is bounded by your device's memory rather than by any upload limit — converting in groups is more reliable than queueing dozens at once.