Add Watermark to PDF
Stamp custom text like CONFIDENTIAL or DRAFT across every page — free, fast, and private.
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Free tier supports files up to 50MB.
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How to Add a Watermark to a PDF Online
A watermark is one of the simplest ways to take control of a document once it leaves your hands. Whether you're sending a draft contract for review, sharing a design proof with a client, or circulating an internal report, a clear line of text across every page tells the reader exactly what the document is and who it belongs to. This free PDF watermark tool lets you stamp custom text onto every page in seconds, directly in your browser, without installing software or uploading your file anywhere.
- 1
Upload your PDF
Drag and drop a file or browse for it. A preview of the first page appears instantly.
- 2
Type your watermark
Enter any short text — CONFIDENTIAL, DRAFT, SAMPLE, your company name, or a copyright line.
- 3
Style and position it
Choose diagonal, centered, or a corner, then fine-tune the size, color, and opacity.
- 4
Download the result
The watermark is stamped onto every page and your new PDF downloads immediately.
Private by design
Your PDF is processed entirely inside your browser and never uploaded to a server.
Every page, one click
The same watermark is applied consistently across the whole document, whatever its length.
Live preview
See exactly how the watermark will look before you download, with no trial and error.
When should you watermark a PDF?
Watermarks are most useful whenever a document is shared before it's final or outside the people who created it. Law firms and HR teams mark drafts and confidential records so nobody mistakes a working copy for a signed agreement. Photographers, designers, and agencies stamp proofs with "SAMPLE" or their studio name so work can be reviewed but not reused without payment. Teachers mark answer keys, businesses brand price lists and proposals, and anyone sending sensitive paperwork can add a recipient's name to discourage forwarding.
Choosing the right position
A diagonal watermark running corner to corner is the classic choice for drafts and confidential files: it crosses most of the page, which makes it hard to crop out of a screenshot. A centered watermark is a softer alternative that still reads clearly. For branding, a corner or footer position keeps your name or copyright notice visible without competing with the content, much like a letterhead.
Getting opacity and color right
The best watermark is obvious at a glance but never gets in the way of reading. For large diagonal or centered text, an opacity between 15% and 35% keeps the words behind it legible. Small corner watermarks can be more solid, around 60–100%, because they don't overlap the main content. Gray is the safest color for most documents, red signals urgency for "CONFIDENTIAL" or "VOID", and your brand color works well for marketing material.
Watermarks are a deterrent, not encryption
It's worth being clear about what a watermark does. It visibly labels a document, discourages casual copying, and makes leaked copies easy to trace back to their source. It does not stop someone from opening, printing, or editing the file. If a document must stay strictly private, watermark it and also limit who receives it, share it through access-controlled storage, or protect it with a password.
Pro tip: keep your original, un-watermarked PDF in a safe place. Once a watermark is added it becomes part of each page, so the easiest way to create a different version later is to start again from the clean original.
Frequently Asked Questions
Can a watermark be removed from a PDF?
This tool adds the watermark as a text layer on each page. That makes it clearly visible and deters casual copying, but someone with professional PDF editing software and enough determination could remove or cover it. A watermark is a visible deterrent and ownership signal, not a lock — for real protection, combine it with access controls on who receives the file.
Will the watermark cover my text?
It sits on top of the page content, which is why opacity matters. At 20–35% opacity the watermark is easy to see while the underlying text stays perfectly readable. Use the live preview to find the right balance for your document.
Which characters can I use in the watermark?
The watermark uses Helvetica Bold, a standard PDF font that every viewer supports. It covers English and Western European letters, numbers, and common symbols such as © and ®. Characters outside that set, such as emoji or non-Latin scripts, are flagged before you download.
Does adding a watermark reduce the quality of my PDF?
No. Your original pages are not re-rendered or compressed — the watermark is simply added on top as sharp vector text, so your document keeps its original quality and stays searchable.
What happens with pages of different sizes or orientations?
The watermark is laid out separately for every page, so it stays correctly positioned and upright on portrait pages, landscape pages, and pages that were saved rotated.
Is my document uploaded anywhere?
No. The whole process runs locally in your browser using JavaScript. Your file never leaves your device, which makes it safe for contracts, financial statements, and other sensitive documents.