Add Watermark to PDF

What this PDF watermark tool adds

Enter a short text label and the tool places that same diagonal text near the center of each page in one selected PDF. The PDF is read in the browser and a revised copy is downloaded. The text is drawn over page content; this tool does not insert an image logo, choose different wording for individual pages, or process several PDFs together.

This free watermark pdf tool does not require an account; for the phrase “watermark pdf free,” it applies one text label to one file at a time. For the “batch watermark pdf” request, note that only one file can be processed per run; batch processing is not available.

Add a text watermark and check the saved copy

1. Enter text using characters supported by the built-in standard PDF font, then adjust opacity.
2. Choose one PDF file up to 20 MB and start processing. The same label is drawn on every page.
3. Open the downloaded PDF and inspect each page, including whether the text covers content or appears too faint.

When someone asks how to watermark a PDF document, the practical check is the saved copy: verify the label’s appearance on pages with different layouts before sharing it.

Limits to check before processing

The tool adds one text line at a centered diagonal position on every page. It has no per-page placement controls, image-logo input, or multiple-file queue. Longer wording is reduced to fit the page width, but layout and rotation can still look different on unusually sized pages.

Encrypted or malformed PDFs and files with unsupported structures may fail to open. Saving a changed copy can invalidate existing digital signatures. The original selected file is left untouched; keep it separately if you need the unmodified document.

Only watermark a document you own or have permission to modify. A watermark can alter readability, so review the exported copy before using or distributing it.

Frequently asked questions