BMP to PNG Converter
Convert BMP bitmap images to PNG format with lossless compression. Dramatically reduce file size while keeping perfect quality.
No data sent to serverRelated Tools
What is BMP to PNG Conversion?
BMP (Bitmap) is an uncompressed image format that stores raw pixel data, resulting in very large file sizes. PNG uses lossless compression to achieve much smaller files without any loss in quality. A BMP file can easily be 10-50x larger than its PNG equivalent.
When to Convert BMP to PNG
Convert BMP to PNG when you need to reduce file size for sharing, uploading to websites, or saving storage space. PNG preserves every pixel of the original BMP while compressing the data efficiently. It also adds transparency support that BMP lacks.
How to Use
- Drag and drop your BMP files onto the upload area, or click to browse.
- You can add multiple files at once for batch conversion.
- Click "Convert to PNG" to start the conversion.
- Download individual files or use "Download All" to get everything.
BMP background
BMP (Microsoft Windows Bitmap, 1990) stores raw uncompressed pixel data — typically 3-4 bytes per pixel. A 1920×1080 image is ~8 MB as BMP but compresses to under 1 MB as PNG without any quality loss. BMP is rarely used today except for system icons (Windows wallpaper format), legacy software, and occasionally for fast-load embedded systems.
You'd encounter BMP files when: rescuing old Windows screenshots, working with legacy CAD/GIS software, processing default Windows wallpapers, dealing with old digital camera exports, or extracting from .exe resources.
FAQ
How much smaller will the PNG be compared to BMP?
Photos: typically 2-10× smaller. Graphics with solid colors / hard edges (logos, screenshots): up to 50× smaller. The biggest gains come from images with limited color palettes that PNG's DEFLATE compression handles efficiently.
Is there any quality loss?
No. Both BMP and PNG are lossless formats — every pixel is preserved exactly. The conversion only changes the storage encoding.
Why are BMP files so large?
BMP stores raw pixels with no compression. A 1920×1080 image at 24-bit color = 1920 × 1080 × 3 = ~6.2 MB. PNG compresses similar content to ~500 KB-1 MB.
Does PNG preserve transparency?
Yes — PNG supports full alpha. Most BMP files don't have transparency (BMP supports it via 32-bit BMP variant, but it's rare). Output PNG will be fully opaque if input BMP was.
Should I use WebP instead of PNG?
For web display: yes — WebP-lossless is 25-35% smaller than PNG. For maximum compatibility / source files: stick with PNG.
Are my files uploaded?
No — all conversion runs in your browser. Files never leave your device.
⚠️ Reference Only
Output is generated based on your input and is provided for reference. Results may vary depending on your specific use case, edge cases, or environment-specific behavior. We do not guarantee accuracy of conversions, validations, or computed values.
Always verify critical outputs against official documentation or production environments. We are not responsible for any decisions or losses based on these tool results.