Convert PNG images to uncompressed BMP locally - for older software and devices, no upload.
Running locally on your device ...
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
BMP is an old, uncompressed Windows image format. Some older programs, machine controllers or microcontroller tools expect exactly this simple format. PNG stores your pixels losslessly, BMP outputs them as raw image data with no compression.
The PNG is decoded locally and written as a valid BMP - 24-bit for opaque images, 32-bit when an alpha channel is present. Nothing is uploaded.
You rarely need the route back to BMP for normal sharing, but regularly in technical niches: embedded displays, older industrial or point-of-sale software and some microcontroller hobby projects expect exactly this raw, easy-to-read pixel data without tricky decoding. Because the method is lossless on both sides, every pixel in the BMP matches the PNG exactly; nothing is added and nothing is lost. Just plan for the larger storage need, since without compression the file grows noticeably with the pixel count.
If your PNG has transparent areas, the tool writes a 32-bit BMP and stores the alpha channel along with it; if the image is fully opaque, the leaner 24-bit format is enough. That keeps the result as small as possible while still matching what the target software expects.
| Input formats | PNG |
|---|---|
| Output format | BMP |
| Batch processing | Yes |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: BMP is uncompressed: the file usually gets noticeably larger than the PNG. That is normal and intended. Very large images need correspondingly more memory.
Yes, usually much larger - BMP is uncompressed. That is normal for this format.
Yes, with transparency a 32-bit BMP is written; otherwise a compact 24-bit BMP.
No, everything runs locally in the browser.
Yes, download individually or as a ZIP.