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Convert PNG images to BMP format, or BMP to PNG, to easily meet your software compatibility and image editing needs.
拖拽或点击上传 PNG / BMP 图片
PNG, BMP
Max 1 MB • Max 5 files
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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.
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.
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.
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.
