Convert BMP to PNG
Convert BMP bitmap images to PNG format instantly in your browser. PNG gives you dramatically smaller files than BMP with zero quality loss — and supports transparency. No upload needed.
Drag 'n' drop files here, or
click to select files
.bmp
Drop your files and click Convert to get PNG
//when_to_use
When to Convert BMP to PNG
- Converting BMP exports from legacy CAD or GIS software to PNG for use in modern documentation and websites
- Compressing massive BMP screenshots from scientific instruments into manageable lossless PNG files
- Converting Windows icon BMPs to PNG for use in cross-platform application development and web UIs
- Preparing BMP graphics from 1990s/2000s Windows software for upload to GitHub, Figma, or design tools
- Archiving old Windows BMP files as PNG to save 60-80% storage space with zero quality loss
//comparison
BMP vs PNG
| Property | BMP | PNG |
|---|---|---|
| Compression | None (uncompressed) | DEFLATE (lossless) |
| Typical file size (1920x1080) | 5-8 MB | 1-3 MB |
| Transparency | 32-bit BMP only | Supported (full alpha) |
| Quality loss | N/A (source) | None (lossless) |
| Web browser support | Limited | Universal |
| Best for | Legacy Windows apps | Web, editing, design |
//how_it_works
How It Works
Drop your BMP files
Drag and drop or select BMP bitmap files. Supports 8-bit, 24-bit, and 32-bit BMP variants with or without alpha channels. Even huge files (100MB+) process fine in your browser.
Browser decodes BMP
The browser's native BMP decoder reads the raw pixel data and renders it onto an HTML Canvas at full resolution. Everything stays on your device.
DEFLATE compression to PNG
The Canvas exports as PNG using DEFLATE lossless compression via Canvas toBlob. File size shrinks dramatically — typically 60-80% smaller than BMP with zero quality loss.
Download your PNGs
Your lossless PNG files are ready. Pixel-perfect identical to the BMP source but dramatically smaller and universally compatible.
// under the hood
BMP stores pixel data uncompressed (typically 24-bit RGB or 32-bit RGBA), making file sizes massive. Our converter uses the browser's native BMP decoder to render the image onto an HTML Canvas, then exports as PNG using the Canvas toBlob API. PNG uses DEFLATE lossless compression with optional alpha channel support — typically achieving 5-10:1 compression vs uncompressed BMP while preserving every pixel exactly.
//faq
Frequently Asked Questions
- What is BMP format?
- BMP (Bitmap) is a Windows image format from 1990 that stores uncompressed pixel data. Every pixel is stored as raw RGB or RGBA values, making BMP files very large — often 5-10x larger than a PNG of the same image. BMP is mostly used in legacy Windows software and icons.
- Why convert BMP to PNG?
- PNG gives you the same lossless quality as BMP but with significantly smaller files thanks to DEFLATE compression. PNG also has universal support on every platform and browser, while BMP is often rejected by modern web services. Converting BMP to PNG keeps every pixel intact while reducing file size by 60-80%.
- Is quality preserved?
- Yes, completely. PNG is a lossless format — every pixel is preserved exactly as it appears in the BMP source. Unlike JPG, there's no compression artifacts or color shift. The PNG output is pixel-perfect identical to the BMP input, just much smaller.
- Is transparency supported?
- Yes. If your BMP is 32-bit with an alpha channel, the transparency will be fully preserved in the PNG output. PNG supports 8-bit alpha transparency natively. Standard 24-bit BMPs without transparency convert to PNG without an alpha channel.
- Is my data private?
- Yes. All conversion happens in your browser using the Canvas API. Your BMP files are never uploaded to any server. We have zero access to your images at any point.
//related_converters
Related Converters
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→Convert BMP to WebP
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→Convert JPG to PNG
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→Convert WebP to PNG
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→Convert GIF to PNG
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→Convert TIFF to PNG
Convert TIFF images to lossless PNG format for web and editing.
→