PNG to BMP & BMP to PNG Converter

PNG/BMP Converter: Core Features & Principles

When you need to import a PNG with a transparent background into legacy software that only supports BMP, or compress a lossless BMP bitmap into a smaller PNG, manual conversion can be time-consuming and may result in quality loss. This online tool performs lossless pixel data conversion between PNG and BMP raster image formats. PNG is a lossless compression format that supports transparency, while BMP is an uncompressed bitmap format that directly stores color information for each pixel. The converter decodes the pixel matrix of the source file and re-encodes it according to the target format's specifications, ensuring the visual content remains unchanged.

Why Choose Our PNG/BMP Converter?

• Precise Pixel-Level Conversion: The tool performs direct mapping and re-encoding of pixel data without any lossy secondary compression or color space conversion, maintaining the visual accuracy of the original image.
• Large File Support: Supports single file uploads up to 1GB, easily handling the format conversion needs of high-resolution design drafts, screenshots, or scanned documents.
• Simple & Efficient Operation: Use drag-and-drop or click to upload. It automatically identifies the input format and executes the corresponding conversion without requiring you to manually select the target format. The converted file is ready for instant download.

How to Use

1. Upload Image: Drag a single PNG or BMP file into the designated area on the page, or click the button to select a file from your device.
2. Automatic Conversion: Once the system identifies the format, it automatically starts the conversion process. The page will display a "Processing" status.
3. Download Result: After the conversion is complete, simply click the newly generated file name link to save it to your device.

Frequently Asked Questions (FAQ)

Q: Why did the file size increase so much after converting PNG to BMP?
This is due to the fundamental difference between the two formats. PNG uses a compression algorithm, while BMP is an uncompressed bitmap. Therefore, the file size usually increases significantly after conversion.

Q: Can this tool preserve the transparent background of a PNG?
Yes. When converting from PNG to BMP, the transparency information (Alpha channel) is converted to a transparent color or solid background supported by the BMP format, depending on the encoding method. However, the shape and outline information of the image will be fully preserved.

Important Notes

Please ensure the uploaded file is a valid PNG or BMP format. The tool processes one file at a time and does not support batch conversion. Since the BMP format is uncompressed, converting PNG to BMP may cause a massive increase in file size, so please be mindful of your storage space. Please download the converted file promptly, as data will be lost if the page is refreshed. This tool processes the core conversion logic locally in your browser; your original image files are never uploaded to our servers, ensuring your privacy is protected.

Technical Notes & Tips

For designers or developers who frequently switch between these two formats, understanding their underlying differences is crucial. BMP is suitable for temporary storage or specific hardware inputs that require extremely high speeds and no compression. PNG is better suited for web pages, UI elements with transparency, or archiving where a balance between quality and file size is needed. A typical use case: converting a website logo with a transparent background (PNG, 50KB) to BMP might inflate the file to several megabytes, but it can then be imported into certain engraving machines or LED screen control software that only recognize BMP. Conversely, converting a scanned BMP document (10MB) to PNG might reduce the size to 1-2MB, making it much easier to email.