All Tools VerseConvert BMP to PNG
Convert BMP bitmap images to PNG losslessly in your browser. Free, offline, client-side - instant preview, alpha preserved, secure.
- Runs in your browser
- Nothing uploaded
- Free, no sign-up
Turn a Windows BMP bitmap into a lossless PNG image in your browser. No upload, no signup.
Drag and drop your BMP here
or click to browse your files
Choose FileNo size limit. The tool runs 100% locally on your computer.
Your PNG preview, size comparison and download appear here.
How to Use Convert BMP to PNG
- Pick a BMP file. Click the upload area or drag a .bmp file from your desktop into the dashed zone. The browser decodes the bitmap instantly - nothing is uploaded to any server.
- Preview and verify. The decoded image appears under the drop zone with a meta line showing its dimensions and original size. If the file is corrupt, an error banner tells you immediately.
- Auto-conversion runs. As soon as the file loads, the tool encodes a lossless PNG in the background. The preview updates and the export buttons light up.
- Check the savings. The stats line reads like "1920×1080 px · BMP 6.2 MB → PNG 820 KB (7.7× smaller, lossless)" so you can see exactly how much space you save.
- Re-encode if needed. Click "Convert" or press Ctrl+Enter (Cmd+Enter on Mac) to re-run the conversion - useful if you accidentally closed the preview or want a fresh blob.
- Copy or download. "Copy PNG" puts the image on your clipboard (Chrome / Edge / Firefox). "Download PNG" saves the file with the original name plus `.png`.
- Reset for the next image. The Reset button wipes state and brings back the drop zone so you can convert another BMP without reloading the page.
Frequently Asked Questions
Is my image data secure?
Yes. Everything happens locally in your browser using HTML5 Canvas. Your file never leaves your device and is not uploaded to any server.
Is this converter free to use?
Yes, this tool is 100% free with no file limits, usage restrictions, or watermarks. Convert unlimited BMP files to PNG format.
Does this work offline?
Yes. Once the page loads, you can convert BMP to PNG without an internet connection. All processing happens locally in your browser.
What file formats are supported?
This tool accepts BMP (bitmap) files as input – both 24-bit and 32-bit variants – and converts them to PNG format. Both are lossless image formats supported on every modern platform.
Why convert BMP to PNG?
BMP files are uncompressed and extremely large. PNG offers lossless compression, reducing file size dramatically while preserving every pixel and any transparency.
Is the conversion lossless?
Yes. PNG is a lossless format, so no image quality is lost during conversion. Every pixel is preserved exactly as in the original BMP.
How much smaller will the PNG file be?
Typically 50-90% smaller than the source BMP. The stats line shows the exact ratio for your specific image. Savings depend on image content – photographs compress less than flat-colour graphics.
Does PNG support transparency?
Yes. PNG supports alpha channel transparency. If your BMP has transparency information (32-bit BMP), it will be preserved in the output. PNG is ideal for logos and graphics requiring transparent backgrounds.
Can I convert multiple files at once?
This tool processes one file at a time. After converting and downloading your PNG, click Reset and upload the next BMP.
What’s the difference between PNG and BMP?
BMP stores raw pixel data without compression, resulting in huge files. PNG uses lossless compression to reduce file size while keeping identical visual quality, making it far superior for most uses.
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