The converter supports PNG, JPEG, WebP, and BMP as both input and output formats. You can convert any of these formats to any other. WebP is recommended for web use due to its excellent compression efficiency. BMP produces large uncompressed files and is mainly useful for compatibility with older software.
No. JPEG does not support transparency. When you convert a PNG or WebP image with a transparent background to JPEG, the transparent areas are automatically filled with white. If you need to preserve transparency, use PNG or WebP as the output format instead.
There is no hard file size limit imposed by the tool itself. However, very large images (e.g. over 20 MB or 8000×8000 pixels) may be slow to process or cause the browser to run out of memory, depending on your device. For very large files, consider resizing the image first before converting.