JPG to BMP
For equipment that wants a raw bitmap — never uploaded.
How it works
Three steps, and nothing leaves your device.
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1
Drop the JPG in
It is decoded in the page; nothing is sent anywhere.
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2
It is written as an uncompressed BMP
Every pixel stored raw.
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3
Download the BMP
Large, and simple enough for very old software.
What you are actually getting
- You get the decoded JPG, artefacts and all. BMP stores exactly what came out of the JPG decoder, including any blocking or fuzz the compression introduced. It is lossless from this point on, but it is not a better picture than the JPG was.
- The size jump is dramatic. Going from a compressed format to no compression at all typically multiplies the file many times over. A large photo can become tens of megabytes.
- The result is fully opaque. A JPG has no transparency to carry across, so the BMP is written without an alpha channel — which is also what older software expects.
- Only do this when something demands it. Embedded displays, industrial controllers and legacy Windows tools sometimes accept nothing else. For any normal purpose the JPG is the better file.
Frequently asked questions
Will the image look better?
No. BMP preserves the decoded JPG exactly, artefacts included.
Why is the file so large?
BMP applies no compression. The size is the pixel count times the bytes per pixel.
When would I need this?
Older Windows software, embedded displays and some industrial equipment that accept only raw bitmaps.
Is my image uploaded?
No. It is converted in your browser.