为图片添加文字水印，自定义位置、透明度、字号和颜色。
Yes, upload a PNG image with transparency for best results.
Yes, once applied and downloaded, the watermark is embedded in the image.
Yes, set opacity from 10% to 100% to make the watermark more or less visible.
Yes, you can tile the watermark across the entire image for maximum protection against unauthorized use.