Add a semi-transparent diagonal watermark text to every page of a PDF file using PyMuPDF, stamping the document for copyright protection, confidentiality notices, or draft identification
Our free PDF watermark tool stamps a semi-transparent diagonal text watermark across every page of your PDF in seconds, so you can mark a document as confidential, flag it as a draft, or label it with your name or company. Type the words you want, upload your file, and download a watermarked PDF where your text sits at an angle over each page. It runs on the PyMuPDF engine and places a clean, evenly angled text watermark on every page at once, and it is completely free, with no ads stamped onto your pages. If you have ever wondered how to add a watermark to a PDF without buying software, this does it right in your browser.
Learning how to watermark a PDF with File Tools Online takes three quick steps, and you do not need Adobe Acrobat or any desktop software. Everything runs online in your browser.
Drag and drop your PDF into the box above, or click to browse and select the file from your device.
Enter the words you want stamped on every page, such as CONFIDENTIAL, DRAFT, or your company name.
Add the watermark and download the finished file. Your PDF is processed securely and deleted within 30 minutes.
The watermarked PDF opens in any PDF reader exactly like the original, with your diagonal text laid over every page. That makes it easy to send, share, or publish a document that clearly carries your notice, without opening a single desktop program.
A lot of "watermark PDF" tools bury the feature behind a paywall, add their own branding, or only stamp the first page. Ours uses PyMuPDF, a fast and reliable PDF engine, to place your text diagonally and semi-transparent across every page, so your notice is impossible to miss and easy to add.
The watermark you type is applied to every page of the document at once, not just the cover, so nothing slips through unmarked.
Powered by PyMuPDF, which writes the text directly into the PDF cleanly and keeps your original pages, layout, and content intact.
Your words are placed at a diagonal angle and made see-through, so the watermark is clearly visible without hiding the text underneath.
Watermark a PDF free online with no trial, and no third-party branding added to the finished file.
Files are processed securely over an encrypted connection and automatically deleted within 30 minutes.
Runs online on Windows, Mac, Linux, Chromebook, Android, and iPhone. Nothing to download and nothing to install.
This tool adds a text watermark, which means you provide the words and the tool prints them onto your document. It is not an uploaded image or logo watermark, so there is no picture to prepare and nothing to size or position by hand. You simply type your text, and it is placed diagonally across the page at a consistent angle, rendered semi-transparent so the original content stays readable through it. Because the text is written onto every page, a reader cannot flip past the notice, and a single glance at any page shows exactly what you wanted to say, whether that is CONFIDENTIAL, DRAFT, COPY, or your own name.
By default the watermark sits as a separate layer over your content. If you want to put a watermark on a PDF so that it cannot easily be selected, deleted, or edited out, run the finished file through our free PDF Flatten tool afterward. Flattening merges the watermark into the page itself, making it permanent and far harder to remove. That two-step approach, watermark then flatten, is the most reliable way to lock your notice onto a document before you share it.
Adding a watermark is one of the simplest ways to communicate the status of a document at a glance. Here are the situations where people most often need to add a watermark to a PDF.
File Tools Online offers more than 100 free tools to convert, edit, and manage your documents. These are the ones people use most alongside the PDF watermark tool.
Because this is a text watermark, the words are entirely up to you. Short, clear text reads best when it is laid diagonally across a page, so pick a phrase that says exactly what you mean. Here are the most common things people write when they watermark a PDF.
Because this is an online PDF watermark tool, it works the same on every device. There is no program to install on Windows, no app to download on Mac, and nothing to add to your phone, you use the exact same page whether you are on a laptop, a Chromebook, an Android device, or an iPhone.
That makes it easy to add a watermark to a PDF on Mac, on a work computer where you cannot install software, or on your phone before you send a file. The watermarking runs on our servers, so even a long document is stamped quickly no matter how powerful your own device is. All you need is a browser and an internet connection, and you can put a watermark on a PDF from anywhere.
Yes. The PDFs people watermark are often contracts, proposals, and reports that contain private information, so security is built in. Files are uploaded over an encrypted HTTPS connection, processed on a secure server, and automatically deleted within 30 minutes. We never share, sell, or reuse your documents.
Upload your PDF to the tool above, type the words you want, and download the watermarked file. The tool places your text diagonally across every page. The whole process takes about a minute and runs online in your browser, there is nothing to install.
The File Tools Online PDF watermark tool is free to use. Just upload the PDF, type your watermark text, and download the result, with no branding of ours added to your pages.
This tool adds a text watermark, meaning you type the words and they are stamped onto the pages. It does not use an uploaded logo or image, so there is nothing to prepare beyond deciding what the text should say.
Common choices are CONFIDENTIAL, DRAFT, COPY, SAMPLE, or your name or company name. Short, clear text works best because it is laid diagonally across each page.
Yes. Your text is applied to every page of the document, not just the first one, so the notice stays visible no matter which page a reader is looking at.
After adding the watermark, run the file through our free PDF Flatten tool. Flattening merges the watermark into the page, which makes it far harder to select, edit, or delete.
No. The watermark is semi-transparent, so it is clearly visible while the original content stays readable through it. Your pages, layout, and text are left intact.
No. This is a free online alternative to Acrobat's watermark feature. It runs the PyMuPDF engine on our servers, so you can watermark a PDF with no paid software and nothing to install.
Exactly the same way as on any other device: open this page in your browser on your Mac, upload the PDF, type your text, and download the watermarked file. There is no separate Mac app to install.
If you have not flattened the file, keep an unmarked original before you watermark, since that clean copy is the simplest way to get a version without the notice. Once a watermark has been flattened into the page, it is designed to be permanent.
Everyday PDFs are watermarked without any hassle, and every page is stamped in one pass. Very long files may take a little longer to process, but the tool is built to handle the documents most people need to mark.
Yes. Files are transferred over an encrypted connection, processed securely, and automatically deleted within 30 minutes. We never share or sell your documents.
A watermark is one of the oldest and clearest ways to say something about a document without changing what it contains. Stamping a page with words like CONFIDENTIAL, DRAFT, or a name tells every reader, at a glance, how the file should be treated. On a PDF, where the same document may be emailed, printed, and forwarded many times, that visible notice travels with the file and keeps its status obvious no matter where it ends up. This is why so many people need to watermark a PDF before they send it out.
A good PDF watermark tool makes that quick and repeatable: you decide what the text should say, and the tool places it neatly across every page. This free online tool does exactly that using the PyMuPDF engine, laying your words diagonally and semi-transparent so they are easy to see and easy to read past. It is free, with no software to install and no image to prepare: type your text, upload your PDF, and download a marked version that is ready to share. When you need the notice locked in, follow up with the PDF Flatten tool to make the watermark permanent.