Is Watermark PDF free to use?

Yes. Watermark PDF on Study Tools Ninja is free for students, with no account required.

Does Watermark PDF work on mobile?

Yes. Study Tools Ninja tools are designed to work on phones, tablets, and desktops used on campus.

Preview and apply text watermarks across PDF pages in your browser. It is built for university and college students working on assignments and exams.

PDF Tools

Preview and apply text watermarks across PDF pages in your browser.

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Privacy: files and QR inputs are processed in your browser on this device. Study Tools Ninja does not upload them to a server.

Limitations & honesty notes

Drop a PDF and adjust text (or image), opacity, angle, and position while watching the live preview.
Choose all pages or a page range.
Apply & download the watermarked file locally.

This tool is optimized around the search terms students use when they need fast assignment help.

Is Watermark PDF free?

Yes. Every Study Tools Ninja tool is free for students.

Does it work on mobile?

Yes. The layout is built for phones and laptops used on campus.

Do you store my data?

Tool inputs run in your browser. Study Tools Ninja does not require an account to use these helpers.