Free PDF Merger is a free PDF merger software to merge multiple PDF files into one big PDF file.

Add watermark to PDF file:

Free PDF Merger may be known as a PDF merging software, but it can also add watermark to PDF files. The trick is adding only one PDF file into the merging list and setting watermark options in the Settings tab.

After downloading and installing Free PDF Merger, select START -> Programs -> Weeny Free PDF Merger -> Weeny Free PDF Merger to run.

1. Click on Add PDFs button. Browse windows will be opened, choose a local PDF file (*.pdf) and click Open. The trick is adding one PDF file only so this software will not merge the PDF file with other files.

2. Click Settings button on the bottom to show PDF settings, click Watermark Settings on the left, select Add watermarks to the document checkbox.

Choose Image watermarks option if you want to add image watermark on PDF file. Click browse button to select a local image file. The image file can be any popular image formats such as BMP, PNG, JPG, GIF or TIF etc.

Choose Text watermarks option if you want to add a text watermark on PDF file. Click Font... button to change font name, size, type, and color. Enter text content in the input box.

You can also set other watermark options such as opacity, rotation angle or offset positions etc. You can preview your watermark on the right section. Click on the figure below to enlarge it.

3. Click on Merge Now! button. Free PDF Merger will add watermark to the PDF file you selected and open the target folder after task is complete. There is only one PDF selected, so this software will not merge PDF files, it just apply watermark on the PDF document.

You can also use our Free PDF Stamper Online program to add watermark or stamp to PDF files online.