If you need to convert images without adding any watermark, you can use Softaken Image Converter Software. I used this program to convert JPG and PNG files into other formats without putting any pictures or branding on the output photos. The software facilitates bulk conversion, preserves the quality of the original image, and does not add any watermark to the converted files. Just upload your pictures, pick the output type you want (such JPG, PNG, BMP, TIFF, etc.), choose the folder where you want them to go, and click "convert." It is very easy to use, even for those who are not technically skilled. This desktop solution is a dependable option if you have trouble with watermark issues with online tools.