FastStone Photo Resizer - Convert and Rename images in batch mode Support JPEG, BMP, GIF, PNG, TIFF and JPEG2000
bulkWaterMark - bulkWaterMark is a batch photo watermarking software for Microsoft Windows.
PhotoBulk - PhotoBulk is a bulk image editor for Mac that was created for the best experience of batch editing. With this image editing software for macOS you can add watermarks, optimize and resize pictures, convert images or rename photos in bulk.
Visual Watermark - Watermark 100 photos in just 1 minute.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
123 Watermark - Simple, Quick and Flexible Image Watermarking Software for Windows.