uMark is a free photo watermark software for adding visible watermarks on digital images. uMark can add text and image watermarks on multiple photos at once. Salient features of uMark are -

✔ Text watermark
✔ Image watermark
✔ QR code watermark
✔ Shape watermark
✔ Batch processing - watermark 5o images at once
✔ Set watermark position, transparency and rotation
✔ Add border and shadow effects to images