Watermark PDF

Upload a PDF and add a large diagonal text watermark on every page. Customize text, opacity, angle, and size. Everything runs in your browser — your files are never uploaded anywhere.

Drop a PDF here

or click to select the file · Accepts .pdf only

    Your PDF is ready

    watermarked.pdf

    Add a text watermark to a PDF online

    This free online watermark tool adds custom text to your PDF in the browser. Your PDF is processed locally with no uploads, so the file remains on your device.

    How to watermark a PDF

    1. Select or drop the PDF you want to watermark.
    2. Enter the watermark text and adjust the appearance options.
    3. Click Apply watermark to add the text watermark to the PDF.
    4. Download the watermarked PDF when the result is ready.

    Why use this PDF watermark tool?

    It is private, free, and available without signup. Because the watermark is applied in your browser, you can mark PDFs on any device without uploading confidential documents.

    Use this tool for the right PDF task

    A text watermark adds a repeated visible label such as Draft, Confidential or a reference. It communicates context but does not encrypt the PDF or prevent copying.

    Use short wording, sufficient contrast and moderate opacity. Test diagonal and footer positions against both light and dark page areas.

    A dependable step-by-step workflow

    1. Work on a copy and open the source once before editing so you know its page count, orientation and important features.
    2. Apply one type of change at a time. For a multi-step job, download and inspect each intermediate result before continuing.
    3. Reopen the final download in a separate PDF reader and compare the changed pages with the source.

    Limitations and checks that matter

    Inspect every page orientation and ensure the label does not hide signatures, totals, barcodes or accessibility-critical text. Keep an unwatermarked master for future revisions.

    Browser processing avoids sending the selected PDF to PDF Online Free, but it does not remove the need to handle the file safely on your own device. Close shared-device sessions, protect downloaded copies and follow any workplace or legal retention rules that apply to the document.

    Plan larger documents and multi-step jobs

    For a long PDF, test the operation on a short representative copy before processing the entire file. Include pages with the most complex layout, the smallest text and any unusual rotation. This reveals quality or compatibility problems early and helps you choose suitable settings without repeatedly handling the complete document.

    When several changes are required, decide the order before starting. Structural actions such as merging, removing and organizing pages normally come first; visible additions such as numbering and watermarks normally come after the sequence is final. Use descriptive output names instead of overwriting the source, and record which operations were applied when the file is part of a business or review process.

    FAQ

    Can I customize the watermark text?

    Yes. Type the text you want to appear as the watermark before applying it.

    Will the watermark be added to every page?

    Yes. The tool applies the text watermark across the pages of the PDF.

    Is my PDF uploaded to add the watermark?

    No. The watermark is added locally in your browser, so the PDF stays on your device.