BMP (Bitmap Image File) and PNG (Portable Network Graphics) are built for different jobs. BMP is typically used for legacy windows apps, embedded systems, while PNG is best for logos, screenshots, web graphics with transparency. Converting lets you open, share or upload your files wherever PNG is expected.
How to use the BMP to PNG converter
- Add your BMP 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 PNG and adjust settingsPNG is selected automatically. Optionally open Settings to change quality, size or background.
- Convert and downloadPress “Convert”. Your PNG files appear instantly — download them one by one or all together as a ZIP.
BMP vs PNG
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
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
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 BMP to PNG?
Add your BMP files above, make sure PNG is selected and press Convert. The PNG files are ready to download a few seconds later — no installation or account required.
Is PNG lossless?
PNG is lossless, so your image keeps its detail.
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 BMP 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 BMP 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.