Convert BMP to Lossless PNG Online
Transform uncompressed BMP bitmaps into efficient, lossless PNG images without losing a single pixel. Runs entirely in your browser — fully private.
Drop your files here
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Images, Audio & Video — up to 1 GB
Max file size: 1 GB · Multiple files supported
BMP to PNG Conversion Features
Upgrade raw bitmap files to a modern lossless format with better compression and transparency support
Lossless Pixel-Perfect Conversion
PNG uses lossless DEFLATE compression — every pixel in your BMP is preserved exactly in the output PNG. Perfect for screenshots, diagrams, and pixel art.
No Upload Delays
Even large BMP files are converted to PNG instantly in your browser — no waiting for server uploads or queues, regardless of your internet connection speed.
Alpha Transparency Ready
PNG supports full alpha transparency, making the converted file ready for use as a design asset, overlay, or web graphic with transparent backgrounds.
Why Convert BMP to PNG?
Designers & Illustrators:
- Convert BMP pixel-art sprites to PNG for use in game engines and design tools
- Transform BMP scanned illustrations to PNG for lossless archiving and editing
- Export BMP mockups to PNG for sharing in design review tools like Figma
Developers & Technical Users:
- Convert BMP test assets to PNG to reduce repository size without quality loss
- Replace BMP resources in desktop applications with web-compatible PNG equivalents
- Convert Windows BMP screenshots to PNG for embedding in technical documentation
Everyday Users:
- Convert old BMP images from legacy software to PNG for modern device compatibility
- Save a BMP drawing from Microsoft Paint as PNG for easy web or app upload
- Convert a BMP photo album scan to PNG for lossless long-term digital storage
How to Convert BMP to PNG:
Upload your BMP file by dragging it onto the converter or clicking to browse
Review the preview to confirm the image looks correct before conversion
Click Convert and download your lossless PNG file instantly
BMP vs PNG: What Changes
Understanding the differences between BMP and PNG helps you choose the right format for your needs.
| Specification | BMP | PNG |
|---|---|---|
| Compression | Uncompressed | Lossless |
| Quality | Excellent | Excellent |
| Transparency | No | Yes |
| Animation | No | No |
| File Size | Very Large | Medium to Large |
Why convert from BMP?
- Very large file sizes
- No compression
- Limited metadata support
Why choose PNG?
- Lossless compression maintains quality
- Full transparency support
- Excellent for graphics and text
When to use BMP
When you need uncompressed images for Windows applications or system use.
When to use PNG
When you need transparency, lossless quality, or working with graphics and logos.
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BMP to PNG Conversion FAQs
Common questions about converting BMP bitmap images to PNG format
What is the main advantage of converting BMP to PNG over BMP to JPG?
PNG uses lossless compression, so the converted image is bit-for-bit identical to the original BMP in terms of colour values. JPG uses lossy compression that subtly degrades quality. Choose PNG when pixel accuracy matters — for screenshots, UI mockups, pixel art, and technical diagrams. Choose JPG for photographs where small size is more important than exact fidelity.
Will converting BMP to PNG make the file smaller?
Yes. BMP stores raw uncompressed pixel data, so a typical 1920×1080 BMP is around 6 MB. PNG uses DEFLATE lossless compression, which reduces the same image to 1–2 MB for screenshots and diagrams. The exact saving depends on image content — solid-colour areas compress very well, while photographic content compresses less.
Does PNG support transparency and does my BMP conversion benefit from it?
PNG fully supports alpha transparency. Standard BMP files do not have a transparency channel, so your converted PNG will have a solid background. However, once converted to PNG you can further edit the file in image editors to add transparency — something you cannot do with BMP.
Is BMP to PNG conversion suitable for archiving old images?
PNG is widely regarded as one of the best archival formats for digital images because it is lossless, open-standard, and universally supported. Converting old BMP files to PNG is an excellent archival strategy — you preserve every pixel while gaining better compression and broader compatibility.
Are there any image types where BMP to PNG conversion does not work well?
BMP to PNG works perfectly for all image types. However, for photographic images with rich colour gradients, the PNG file may still be significantly larger than a JPG equivalent. If you are optimising photos for the web, JPG or WebP may be a better final format.
Is my BMP file private when I use this converter?
Yes, absolutely. All processing is done locally in your browser using the HTML5 Canvas API. Your BMP file is never transmitted to any server — it stays on your device throughout the entire conversion process.