BMP to PNG
Same pixels, a fraction of the size — never uploaded.
How it works
Three steps, and nothing leaves your device.
-
1
Drop the BMP in
It is decoded in the page; nothing is sent anywhere.
-
2
It is written as PNG
Lossless: every pixel is preserved exactly.
-
3
Download the PNG
Much smaller, and pixel-for-pixel identical.
The conversion that costs you nothing at all
- This is a free win, unlike most conversions. BMP stores every pixel uncompressed; PNG stores exactly the same pixels with compression applied. The image is bit-for-bit identical and the file is a fraction of the size. There is no quality decision to make.
- Prefer this over JPG for anything with text or sharp edges. Screenshots, diagrams and UI captures — the things that usually arrive as BMP — are exactly what JPG handles worst. BMP to JPG goes smaller still, but adds visible fuzz around every letter.
- Transparency is preserved where it exists. Most BMP files are opaque, but 32-bit BMPs can carry an alpha channel, and PNG keeps it.
- BMP usually means old software. Windows utilities, scanners and embedded devices still write it by default. Converting once at the start of a workflow saves carrying tens of megabytes around for no benefit.
Frequently asked questions
Does the image change at all?
No. Both formats are lossless, so the pixels are identical.
How much smaller will it be?
Substantially — BMP applies no compression whatsoever. The exact figure depends on the image.
Should I use JPG instead?
Only for photographs. On a screenshot or anything with text, PNG is clearly better.
Is my image uploaded?
No. It is converted in your browser.