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Instantly convert your PNG files to BMP format right in your browser. No uploads, no registration, 100% free and private.
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How to Convert PNG to BMP
Upload Files
Select your PNG files by dragging and dropping or clicking to browse.
Choose Settings
BMP is pre-selected. Adjust quality and metadata options if needed.
Download
Click Convert and download your BMP files instantly.
Why Convert PNG to BMP?
PNG to BMP conversion creates large uncompressed files, primarily for compatibility with very old Windows applications or specialized hardware systems. BMP offers no compression advantages over PNG, but is sometimes required by legacy CAD software or industrial imaging systems.
PNG vs BMP: File Size Comparison
Based on a typical 12-megapixel photograph (4000 × 3000 pixels) at default quality settings.
Removes PNG compression and stores raw pixel data. Transparency is lost.
PNG vs BMP Comparison
| Feature | PNG | BMP |
|---|---|---|
| Compression | Lossless | Lossless |
| Transparency | Yes | No |
| Animation | No | No |
| Browser Support | Universal | Universal |
| Typical File Size | Medium to large | Very large (uncompressed) |
| Best For | Logos, graphics, screenshots, transparency | Legacy systems, raw image data |
PNG to BMP on Every Platform
Batch Conversion
PhotoFormatLab processes all files in your browser using Web Workers for parallel conversion. You can convert hundreds of PNG files to BMP simultaneously — the speed depends on your device's CPU, not your internet connection.
Common Issues and Solutions
Transparent areas appear as white or black after conversion to BMP
BMP does not support transparency. Transparent pixels are composited onto a white background by default. If you need to preserve transparency, consider converting to PNG or WebP instead.
Conversion is very slow on my device
Large files (over 20 MB) require significant CPU processing since conversion happens entirely in your browser. Close other browser tabs to free up memory, or try converting fewer files at a time. On mobile devices, the process is naturally slower than on desktop computers.
The output file is much larger than expected
This typically happens when converting from a highly compressed format (like PNG) to a less compressed one (like BMP). The output reflects the actual image data, not the compression efficiency of the source. Lossless formats like BMP prioritize quality over file size.
Frequently Asked Questions
For a typical 12-megapixel photograph (4000×3000 pixels), a PNG file of approximately 14.2 MB converts to a BMP file of approximately 34.3 MB — a change of +142% (uncompressed). Removes PNG compression and stores raw pixel data. Transparency is lost.
BMP uses lossless compression, so there is no quality setting to adjust — every pixel from your PNG file is preserved exactly in the output. The file size is determined by the image content rather than a quality parameter.
No. PhotoFormatLab converts files entirely in your browser using JavaScript, Canvas API, and WebAssembly. Your images never leave your device — no upload, no server processing, no cloud storage. This makes the conversion completely private and works even without an internet connection after the page loads.
There is no artificial limit. You can convert hundreds of files in a single batch. The practical limit depends on your device's available memory and CPU speed. For very large batches (500+ files), we recommend processing in groups of 50-100 for optimal performance.
Most individual files convert in under 2 seconds on a modern device. A batch of 50 files typically completes in 30-60 seconds. Since processing happens on your device, conversion speed depends on your hardware — desktop computers are generally faster than phones. There is no upload or download wait time.
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