BMP to PNG
Free BMP to PNG converter - convert in your browser, no upload, no sign-up.
100% free. Runs entirely in your browser - your files and data never leave your device and nothing is uploaded to any server.
Drop BMP files here or click to upload
Supports multiple files
About this tool
Convert BMP images to PNG straight in your browser. BMP is an uncompressed Windows format that stores every pixel at full size, and BMP files are enormous - a single phone photo can run past 20 MB - which is usually why you are here. PNG is a lossless format that keeps transparency, which is why logos, icons and screenshots are usually saved as one. Files usually come out a little smaller. Both formats are lossless, so every pixel survives the conversion exactly. PNG supports transparency, but converting cannot invent it - a BMP has no transparent pixels to carry over. You gain the ability to erase a background later, not a background that is already gone. Nothing is uploaded. Your BMP files are decoded and re-encoded by your own device, so they never travel to a server, there is no queue behind other people's files, and there is no cap on how many you convert.
How to use this tool
- Add your BMP filesClick the box or drag BMP images onto it. Nothing is uploaded - your browser reads the files directly.
- Let it convertEach image is decoded and re-encoded as PNG on your device. A large batch takes a moment; nothing is queued on a server.
- Download your PNG imagesSave them one at a time, or take the whole batch as a single ZIP.
Key features
- No sign-up, no watermark and no file-count limit.
- Batch conversion - drop a whole folder and convert it in one pass.
- Works offline once the page has loaded.
- Shows the before and after size of every file, so you can see what the conversion cost or saved.
- Converts BMP to PNG without uploading anything.
Common uses
- Preparing BMP images for a platform that rejects the format on upload.
- Opening a BMP in software that only accepts PNG.
- Getting BMP images into a document, presentation or email that refuses to embed them.
- Archiving BMP originals in a format you will still be able to open in ten years.
- Converting a batch of BMP files handed over by a client or a colleague.
Tips for better results
- Convert from the highest-quality BMP you have, not one that has already been resized or re-saved.
- Batch the whole folder in one pass - converting one file at a time is the slow way to do this.
Mistakes to avoid
- Renaming the file extension by hand instead of converting. That changes the name, not the data, and the file simply fails to open.
- Expecting PNG to repair a low-quality BMP. Conversion changes the container, never the pixels already inside it.
Supported formats
- BMP
- PNG
Frequently asked questions
Drop your BMP files onto the box above and download the PNG results. It all happens on your device - no upload, no account, no queue.
Both formats are lossless, so every pixel survives the conversion exactly.
No. The conversion uses your own device's image engine, so your BMP files never leave your computer. That also means it works with confidential material and on a slow connection.
PNG supports transparency, but converting cannot invent it - a BMP has no transparent pixels to carry over. You gain the ability to erase a background later, not a background that is already gone.
Yes, completely - no sign-up, no watermark and no limit on how many files you convert. The work runs in your browser, so it costs nothing to provide.
Yes. The converter runs in the browser, so it works on iPhone and Android as well as desktop, without installing an app.
Yes. Add as many as you like and they are processed together, then download them one by one or as a single ZIP.
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