Add a Watermark to PDF Online Free

Apply a diagonal DRAFT-style text watermark across every page. Local processing, free, no upload.

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How to use the PDF Watermark

  1. Upload your PDF

    Choose the document to watermark.

  2. Enter the watermark text

    Type a word such as DRAFT or CONFIDENTIAL and choose a font size.

  3. Apply and download

    Light grey diagonal text is stamped across every page.

PDF Watermark FAQ

Can I add an image or logo watermark?

This tool adds text. For a logo, use Insert Image into PDF to place a PNG on the page.

Does the watermark appear on every page?

Yes. The same diagonal text is applied to all pages.

Will the watermark hide my content?

No. It is drawn semi-transparent in light grey so the page remains readable.

Is my PDF uploaded?

No. The file is processed by JavaScript inside your browser tab and never sent to our servers. Closing the tab clears it from memory.

Is it free?

Yes — and we never add our own watermark.

Quick answers

Do EasyPDFHub tools upload my files to a server?

No. EasyPDFHub runs conversions and edits inside your web browser using JavaScript libraries such as pdf-lib and the Canvas API. When you pick a file, it stays on your device in memory until you download the result. We do not operate a file-upload API for PDF or image processing, so there is no account, queue, or cloud storage step. That makes the tools suitable for contracts, payslips, ID scans, and other sensitive documents you would not email to a random website. You need a modern browser (Chrome, Edge, Firefox, or Safari) and a stable device — very large files may be slower because processing uses your CPU, not remote servers. Always keep a backup of originals before editing.