Convert BMP to PNG Free Online
Fast, private BMP to PNG conversion. No signup required. Files never leave your browser until conversion.
Drop images here or browse
Multiple files supported · Max 20 MB each
Private
Files never stored
Batch
Multiple at once
Lossless
Quality control
Why Convert BMP to PNG?
Converting BMP to PNG dramatically reduces file size while maintaining lossless quality and adding transparency support. PNG is the modern replacement for BMP.
Common Use Cases
- Modernizing legacy BMP image collections
- Reducing storage from uncompressed BMP files
- Making BMP images web-compatible
- Adding transparency to BMP graphics
Source Format
BMP
Bitmap Image File
BMP is an uncompressed raster image format native to Windows. It stores pixel data directly without compression, resulting in large file sizes but perfect quality.
+ No compression means zero quality loss
+ Simple format, easy to read and write programmatically
+ Native Windows support
- Extremely large file sizes
- No transparency support
Target Format
PNG
Portable Network Graphics
PNG is a lossless raster image format that supports transparency. It is widely used for web graphics, screenshots, and images that require crisp edges or transparent backgrounds.
+ Lossless compression preserves every pixel
+ Full alpha transparency support
+ Universally supported across all browsers and platforms
- Larger file sizes compared to lossy formats like JPEG or WebP
- Not efficient for photographs with complex color gradients
Quality & Size Notes
Both formats are lossless, so no quality is lost. PNG files are typically 50-80% smaller than BMP thanks to compression.
Frequently Asked Questions
Is there quality loss converting BMP to PNG?
No. Both are lossless formats. PNG compresses the data more efficiently but preserves every pixel.
How much smaller will my files be?
PNG files are typically 50-80% smaller than BMP, depending on image content. Images with large areas of uniform color compress particularly well.
Should I ever keep BMP instead of converting?
Only if your application specifically requires BMP. In almost every other case, PNG is superior — smaller, web-compatible, and supports transparency.