BMP to PNG Converter
A BMP from a screenshot tool, a game capture or an old design program is exact but heavy, and many modern services will not take it. PNG keeps every pixel exactly as it is while storing the data in a compressed form. Convert here, privately, with no quality slider to worry about.
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Free to use on any site. Paste the code where you want the tool to appear. It runs inside the page; visitors' files are processed in their own browser and are not uploaded.
WordPress and most site builders have a "Custom HTML" block where this code can be pasted. The embed keeps a small link back to CalcMaster.
How to convert BMP to PNG
- Add your BMP files by dropping them, clicking the drop zone or pasting.
- The output format is already set to PNG. Adjust quality or size if you need to.
- Press Convert and compare the original and new size for each file.
- Download each file or all of them as a ZIP.
When to convert, and when not to
- The BMP is a screenshot, diagram, logo or pixel art and you cannot afford any blur.
- You want a lossless copy that works in browsers, documents and design tools.
- You plan to edit the image again and do not want repeated quality loss.
- Skip it for large photographs when small size matters most; JPG or WebP will be lighter, although they are lossy.
What changes
- Pixels are preserved exactly. PNG compresses the data without discarding anything, so the picture looks identical.
- There is no quality slider because PNG output here is lossless.
- The file is usually smaller than the uncompressed bitmap, but photographs can still stay fairly large. Check the sizes in the queue for your own files.
- Most BMP files carry no transparency, so the result is an ordinary opaque PNG unless your bitmap has an alpha channel your browser understands.
- Other file metadata is not carried over.
Same pixels, different packaging
BMP and PNG can both hold an image with no loss of detail. The difference is storage. A BMP lists pixel values directly, while PNG applies a reversible compression, similar in spirit to zipping a document. When you open the PNG, you get back exactly the pixels you put in.
That is why this pair is a safe choice for archiving or handing a file to someone else. Nothing about the picture changes except the container.
When PNG beats the other options
For flat colours, sharp text and interface screenshots, PNG usually produces a small file and keeps edges crisp. These are the images where JPG shows ugly halos around letters. If your BMP is that kind of picture, PNG is the right target.
For photographs, PNG will often be larger than JPG or WebP because natural images contain a lot of tiny variations that are hard to compress without loss. If you need a smaller photo, consider converting to one of those formats instead, and compare real results from your own files.
Resizing while you convert
The options panel can scale the picture by percent or limit its width and height. This is handy when an old bitmap is far larger than any screen needs. Resizing happens before encoding, so the PNG you download already has the new dimensions.
A common reason to choose this pair is screenshots saved by old Windows tools. Those files are full of flat colours and straight lines, which compress very well without any loss, so the PNG can be dramatically lighter than the bitmap. Photographs behave differently, so judge by the sizes the queue reports rather than by assumption.
If the destination accepts both PNG and JPG and the picture is a photograph, you may prefer JPG for size. If it is a diagram, interface capture or anything with text, stay with PNG so the edges never blur.
Privacy: your files stay on your device
- The tool decodes, resizes and encodes your pictures with your browser. The files are never sent to a server.
- To check it yourself: open the browser developer tools (F12), open the Network tab, convert a file, and look for any request that carries your image. You will see none.
Frequently asked questions
Does converting BMP to PNG reduce quality?
No. PNG is lossless, so the pixels in the result match the pixels in the bitmap.
Why is my PNG still big?
Photographs and noisy images do not compress well without loss. Try JPG or WebP if a smaller file matters more than exact pixels.
Will the PNG have a transparent background?
Only if the source bitmap carries transparency your browser can read. Most BMP files are fully opaque, so most results are too.
Is there a size limit?
There is no fixed limit in the tool, but very large images can exceed what a browser or phone can handle. If you see an error, use the Resize option to reduce the pixel size.
Do I need to install anything?
No. Everything runs in your browser tab and nothing is sent to a server.