BMP to JPG
Cut a huge bitmap down to a normal file — never uploaded.
How it works
Three steps, and nothing leaves your device.
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1
Drop the BMP in
It is decoded in the page; nothing is sent anywhere.
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2
It is re-encoded as JPG
At 92% quality, which is invisible on a photograph.
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3
Download the JPG
A small fraction of what the BMP weighed.
Why BMP files are so large
- BMP applies no compression whatsoever. It stores three or four bytes for every single pixel, so the file size is simply width × height × bytes-per-pixel. A 12-megapixel photo as a BMP is tens of megabytes before it has done anything useful. This is the conversion that fixes that.
- The reduction is dramatic. Going from no compression to JPG typically cuts the file to a small percentage of its original size, with no visible difference on a photograph.
- Nothing meaningful is lost for most uses. BMP is lossless, JPG is not, so in the strictest sense detail is discarded. On a photograph at 92% quality you will not see it. On a screenshot with text you might, and PNG would be the better destination there.
- You usually meet BMP through old software. Windows utilities, scanners, embedded devices and some industrial tools still write BMP by default. That is normally where these files come from, and converting once at the start saves carrying the weight around.
Frequently asked questions
Why is my BMP so big?
BMP stores every pixel uncompressed. The size is just the pixel count times the bytes per pixel.
How much smaller will the JPG be?
Typically a small fraction of the original, with no visible change on a photograph.
Should I use PNG instead?
If the image is a screenshot or has text in it, yes — PNG is lossless and handles sharp edges better.
Is my image uploaded?
No. It is converted in your browser.