Convert a Windows BMP image to PNG in your browser. The output is lossless, smaller in most cases, and accepted by modern software.
The converted PNG appears here.
Your file is never sent to a server. It is read and processed by your own browser, and the results are not stored.
Windows software, older scanners and some industrial tools still write BMP because it is simple: a header followed by pixel rows, with no compression to implement. That simplicity is also why the files are large and poorly suited to the web.
PNG keeps the lossless promise and adds compression. For screenshots, diagrams and icons, it is usually the better file to send or publish.
This tool asks the browser to decode the BMP, draws the decoded pixels to a canvas, and encodes PNG. It does not parse or rewrite the bitmap header itself, so support follows the browser. The dimensions shown after conversion are the decoded dimensions, not a guess from the file name.
No. BMP to PNG Converter runs in your browser, and the file is read there rather than sent to a server for processing. Our host still sees ordinary page-request metadata, which is described on the privacy page.
Yes, BMP to PNG Converter is free, with no paid tier, no account, and no watermark added to your output. The limits are technical rather than commercial: file size, page count and supported formats are listed on this page.
BMP to PNG Converter supports .bmp files up to 50MB directly in your browser.
Yes. BMP pixels are decoded without loss and PNG stores them exactly. Pixel dimensions do not change.
BMP is typically uncompressed, while PNG applies lossless compression. A simple diagram can shrink dramatically; a noisy photograph shrinks less because its pixels are harder to compress.
The tool uses the browser’s own BMP decoder. Common Windows bitmap files work. Uncommon variants such as OS/2 headers, some RLE encodings or deeply unusual bit depths may be refused; the tool shows an error instead of a blank image.
If the BMP decoder reports an alpha channel, PNG can keep it. Most BMP files are fully opaque, so the result is usually opaque too.