How to Number a PDF After Merging Pages
Merge first and number second. A final numbering pass creates one sequence and keeps cover-page arithmetic clear.
Drop a PDF hereThe file is read in your browser and never uploaded.
Guides and articles
Read instructions and examples for this tool.
Why a PDF Watermark Is Not a Security Control
A watermark can follow a page into a printout or screenshot. It cannot stop copying, reading or removal.
Add Page Numbers to a PDF, Including the Title Page Case
Number a merged or scanned PDF. Review position, format, start value, and the arithmetic that decides what Page 3 of 12 really means.
Add a Watermark to a PDF, and What It Does Not Protect
Mark a document DRAFT or CONFIDENTIAL before it leaves your hands. Review opacity, angle, page selection, and the security a watermark honestly does not give you.
Why Use Our PDF Watermark Tool?
Marking a document DRAFT or CONFIDENTIAL before it leaves your hands is a small job that usually needs a large program. The alternative most people reach for is a website that wants the document uploaded first, which is an odd thing to do with a file you are about to label confidential. This page draws the text over every page in your browser and gives the file straight back.
A watermark is text drawn on top of a page at low opacity, rotated so it crosses the content. That is all it is, and knowing that tells you what it is good for.
It is good at signalling. A reader who opens a page stamped DRAFT knows immediately not to treat it as final, and a page stamped CONFIDENTIAL carries its handling instruction with it wherever it is forwarded. That signal survives printing, screenshotting and forwarding, which is more than can be said for an email footer.
It is not good at preventing anything. The original content is untouched underneath — that is the point of drawing over it rather than rewriting it — so the text stays selectable and the page stays intact. A watermark can be removed by anyone with a tool like this one. Treat it as a label, never as a lock.
The default size is computed rather than fixed: the text is scaled so it spans the page's diagonal. A mixed document of portrait and landscape pages therefore gets a mark that looks deliberate on both, instead of one that is right on A4 and comically wrong on a wide sheet.
How it compares
Most online watermark tools upload the PDF. A document you are about to mark CONFIDENTIAL is precisely the one that should not be sent to a third party to have the label applied. This page never sends it anywhere.
Desktop editors do this and much more, at the cost of an install and often a subscription. If you also need to sign or redact, PDF Editor has the full annotation toolkit, and PDF Page Numbers is the other common finishing step before a document goes out.
PDF Watermark Tips
- Low opacity is usually right. Around 0.15 marks the page clearly and still lets the text underneath be read.
- The default 45 degree angle spans the page diagonally, which is harder to crop out than a horizontal line.
- Leave the size at its default and the text is scaled to the page, so it looks the same on every sheet whatever their sizes.
- Leave Pages empty to stamp everything. Name pages when only a section needs marking.
- The text is drawn over the existing content, so the page underneath is unchanged and still selectable.
Frequently Asked Questions
Is my PDF uploaded?
No. The file is read and rewritten in your browser. Nothing is sent to a server.
Does a watermark protect my document?
No, and it is important to be clear about that. It is a visual label. The original content is untouched underneath and anyone can remove the mark with a tool like this one. Use it to signal handling, never to prevent copying.
Can I watermark only some pages?
Yes. Put page numbers and ranges in the Pages field, such as 1,3,5-8. Leave it empty and every page is stamped.
What opacity should I use?
Around 0.15 is the usual choice: clearly visible, and still light enough to read the page through. Raise it for a mark that must not be missed, lower it for a subtle one.
Will the text underneath still be selectable?
Yes. The watermark is drawn on top and changes nothing beneath it, so text stays selectable and searchable.
Can I use an image instead of text?
Not yet — this page draws text. For a logo or a signature image, PDF Editor has an image stamp.
What does the angle do?
It rotates the text. The default 45 degrees runs it diagonally across the page, which reads clearly and is harder to crop away than a horizontal line.
Does it work on a scanned PDF?
Yes. A scan is a page with an image on it, and the watermark is drawn over that image the same way.
Can I remove a watermark I added?
Not with this page. Keep the original file — the watermarked copy is a new document, and the original is unchanged on your disk.
Can I use this from a script or an AI client?
Yes. The same stamper is available over HTTP and to MCP clients, so an agent can watermark a document without opening this page.