PNG (Portable Network Graphics) and BMP (Bitmap Image File) are built for different jobs. PNG is typically used for logos, screenshots, web graphics with transparency, while BMP is best for legacy windows apps, embedded systems. Converting lets you open, share or upload your files wherever BMP is expected.
How to use the PNG to BMP converter
- Add your PNG filesClick “Choose Files” or drag and drop them into the box. You can add many files at once — or paste a file with Ctrl+V.
- Choose BMP and adjust settingsBMP is selected automatically. Optionally open Settings to change quality, size or background.
- Convert and downloadPress “Convert”. Your BMP files appear instantly — download them one by one or all together as a ZIP.
PNG vs BMP
PNG Portable Network Graphics
PNG stores raster images with lossless compression, so every pixel is kept exactly. It handles full alpha transparency, which makes it the standard choice for logos, icons, UI screenshots and graphics with sharp edges or text.
- Compression
- Lossless
- Features
- Supports transparency
- Origin
- 1996, W3C
- Best for
- Logos, screenshots, web graphics with transparency
BMP Bitmap Image File
BMP stores raw pixel data with little or no compression. Files are large but simple to read, which is why legacy Windows software, embedded devices and some printers still require it.
- Compression
- Uncompressed
- Features
- No transparency (usually)
- Origin
- 1985, Microsoft
- Best for
- Legacy Windows apps, embedded systems
Why use ConvertMathly?
Files are processed on your device and never uploaded. Close the tab and they are gone.
No account, no daily cap, no queue and no watermark — convert as much as you want.
No waiting for uploads or downloads: results are ready as fast as your device can process them.
Windows, Mac, Linux, Chromebook, iPhone and Android — any modern browser, nothing to install.
Frequently asked questions
How do I convert PNG to BMP?
Add your PNG files above, make sure BMP is selected and press Convert. The BMP files are ready to download a few seconds later — no installation or account required.
Is BMP lossless?
BMP is uncompressed, so your image keeps its detail.
What happens to transparent areas?
BMP does not support transparency, so transparent pixels are filled with a background color — white by default. You can choose any color in Settings.
Is there a file size or daily limit?
No. Since everything runs locally, there are no daily caps, queues or file size limits beyond what your device can handle.
Are my PNG files uploaded to a server?
No. ConvertMathly converts files entirely inside your web browser using JavaScript and WebAssembly. Your files never leave your computer or phone, which makes it safe for private photos and documents.
Can I convert multiple PNG files at once?
Yes — add as many files as you like. They are converted one after another and you can download everything in a single ZIP.