How to use the Add Watermark
- Upload your file. Click “Choose file” or drag and drop your PDF files (you can add several and reorder them).
- Choose your options. Adjust the settings: Watermark text, Font size, Colour, Opacity and Angle. The defaults work well for most files.
- Process the file. Click “Add watermark”. Your file is processed securely on our server and deleted immediately afterwards.
- Download the result. Preview or download the output. For multiple files use “Download all (ZIP)”.
About this tool
Merge, split, compress, convert, edit, sign, protect and analyse PDF files online.
Read the complete Add Watermark guide
Frequently asked questions
Is the Add Watermark free to use?
Yes. The Add Watermark on Gemma-4 is 100% free with no sign-up, no limits and no watermark. An optional free account lets you save favourites.
Are my files safe?
Yes. Files are processed in memory on our secure server over HTTPS and are deleted immediately after processing. We never store or share your documents.
Does it work on mobile phones?
Absolutely. The Add Watermark is fully responsive and works on Android, iPhone, tablets and desktop browsers such as Chrome, Edge, Safari and Firefox.
Is there a file size limit?
You can upload files up to 50 MB each. For very large files, splitting them first gives faster results.
Who is the Add Watermark useful for?
It is popular with students submitting assignments, office workers handling documents, government-form applicants — anyone who needs quick, reliable help with working with PDF documents quickly and securely.