PDFThings

Watermark a PDF Online

Watermark a PDF online with no install and no account. Add custom text watermarks to PDF files. Upload up to 20 PDFs per job, process instantly, and download clean output.

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Watermark a PDF online in your browser — no desktop app, no install, no account. Open the page, drop in your files, and download the result in seconds. Everything runs through an encrypted connection and your files are auto-deleted within 12 hours.

The tool accepts up to 20 PDFs per job, lets you watermark them in the order you choose, and produces clean output every time.

Why use this merger

Full text control

Set your watermark text — a name, brand, or word like CONFIDENTIAL.

Adjust opacity

Choose 10% for a subtle mark or 75% for an unmistakable one.

Choose angle and placement

Diagonal, horizontal, or vertical — above or below the content.

Mark every page

Your watermark is applied across the whole document in one pass.

How to watermark a pdf online

  1. 1

    Upload your PDF

    Select the PDF you want to watermark.

  2. 2

    Set your watermark

    Enter the text, then choose opacity, angle, and placement.

  3. 3

    Watermark and download

    Run the tool and download the watermarked PDF.

Related ways to merge PDFs

Watermark a PDF FreeWatermark a PDF on WindowsWatermark a PDF on AndroidAll Watermark PDF features

Frequently Asked Questions

Is watermarking PDFs online safe?
Yes. Files are uploaded over an encrypted connection and automatically deleted from our servers within 12 hours.
Do I need to create an account?
No. The tool works without registration — upload, process, and download.
How many files can I watermark at once?
You can watermark up to 20 PDFs per job in a single job.