Convert BMP images to PNG with lossless compression. Reduce file size by 50-70% without any quality loss.
Drag & drop files here
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Max file size: 10MB · Max 2 files at once
BMP files are uncompressed and take up unnecessary storage. If you need to shrink them without losing a single pixel, PNG is the right target format. ConvertFile converts BMP to PNG in your browser with lossless compression. No upload, no quality loss.
Select or drag and drop your BMP file
Preview the image
Click Convert and download your PNG
BMP files are uncompressed, meaning every pixel is stored as raw data. A 1920x1080 image takes about 5.5MB in BMP format. PNG uses lossless compression to reduce that to 1.5-3MB, a 50-70% reduction, without discarding any pixel data.
Choose BMP to PNG conversion when quality preservation is critical. Unlike JPG, no information is lost. PNG is the right choice for screenshots, graphics with text, logos, and images you plan to edit further. PNG also adds transparency support, which BMP lacks.
| Aspect | BMP | PNG |
|---|---|---|
| Compression | None (uncompressed) | Lossless |
| File Size (1920x1080) | ~5.5 MB | ~1.5-3 MB |
| Transparency | Limited | Yes (alpha channel) |
| Best For | Legacy Windows apps | Screenshots, logos, graphics |
| Browser Support | Most browsers | All browsers |
| Quality Loss | None (uncompressed) | None (lossless) |
BMP (Bitmap) is an uncompressed image format associated with Microsoft Windows. It stores raw pixel data without any compression, which means perfect quality but very large files. A standard 1920x1080 image takes about 5.5MB in BMP format. BMP is still used in some legacy Windows applications and specialized workflows that require raw pixel access, but it is not suitable for web use or modern sharing.
PNG (Portable Network Graphics) is a lossless image format created in 1996 as a patent-free alternative to GIF. It supports full-color images with an alpha channel for transparency. PNG files preserve every pixel exactly, which makes them ideal for screenshots, logos, UI elements, and graphics with sharp text. The trade-off is file size: PNG images are typically 3-5x larger than equivalent JPG files for photographic content.
ConvertFile uses the HTML5 Canvas API to convert images directly in your browser. Your BMP files are never uploaded to a server. The conversion runs on your device's hardware, which is why it finishes in under 2 seconds. Once you close the tab, the converted files are gone from memory.
Yes. PNG uses lossless compression, so every pixel from your BMP is preserved exactly. You get a smaller file with zero quality loss. The image is bit-for-bit identical.
PNG files are typically 50-70% smaller than BMP for the same image. A 5.5MB BMP (1920x1080) becomes roughly 1.5-3MB as a PNG, depending on image content.
Choose PNG when you need lossless quality, transparency support, or the image contains text, sharp edges, or graphics. Choose JPG for photographs where file size matters more than pixel-perfect accuracy.
The conversion runs in your browser using the Canvas API and does not need a server. You need to load the page initially, but the actual conversion works without an internet connection.
Yes. No files are uploaded to any server. Everything is processed locally in your browser. You can verify this by checking the network tab in your browser's developer tools.
Yes. PNG supports full alpha channel transparency. If your BMP has a solid background, you can later edit the PNG in an image editor to add transparency.
Yes. You can add up to 2 files per batch. Each file converts independently, and you can download them all when finished.
No. The output PNG has the exact same width and height as the input BMP. Only the file format and compression method change.