How to Watermark a PDF

1. Scroll up to the tool above and click the “Choose Files” button to select your PDF from your device. The file will load as a thumbnail in the browser window.
2. Choose your watermark type by selecting either “Text” or “Image” from the options provided. For text, enter your desired watermark text.
3. Adjust watermark settings to customize opacity, rotation, and position. For images, ensure your file is transparent PNG or JPEG.
4. Preview your changes with the live preview feature to ensure the watermark is placed correctly.
5. Download the watermarked PDF by clicking the “Download” button, which will initiate the download directly to your device.

Common use cases

Camille, a freelance photographer, uses the PDF Watermarker to add a diagonal ‘PROOF — DO NOT REPRINT’ text stamp to client-preview PDFs before email delivery. This browser-based privacy ensures her clients’ documents are secure and protected from unauthorized use.

Adrian, a corporate trainer, adds a ‘CONFIDENTIAL — INTERNAL USE ONLY’ watermark to leadership-development slide PDFs before distribution. The tool’s client-side processing means Adrian’s confidential training materials remain private and secure, without any risk of server-side exposure.

Ji-hoon, a startup founder, brands investor-deck PDFs with a faint logo image watermark on every page before sharing with prospective backers. The privacy-first approach ensures that Ji-hoon’s sensitive business information stays confidential, as files are never uploaded to a server.

Maya, an attorney, adds a court-filing date stamp watermark across every page of a brief before submission. Using our tool, Maya can ensure that her legal documents are protected with a watermark that never leaves her device, maintaining confidentiality and compliance.

How it works (privacy & technical)

Our PDF Watermarker tool uses pdf-lib 1.17.1 and PDF.js 3.11.174 to run entirely in the user’s browser, ensuring no files are uploaded to any server. PDFs are loaded as Uint8Array byte streams in browser memory, and operations such as PDFDocument.copyPages and getPage are executed within the JavaScript engine. This client-side processing means the browser network layer is never invoked for file content, contrasting with server-based tools that require an upload and thus leave a trace in server logs.

The privacy-first approach ensures that your documents remain confidential and secure, as they never leave your device. This method also aligns with the security requirements of various industries, from legal to corporate training, by eliminating the risk of data breaches or unauthorized access.

Frequently Asked Questions

Are my files uploaded to your servers?

No, all operations are performed client-side using pdf-lib 1.17.1 and PDF.js 3.11.174. Your PDF files remain on your device, ensuring complete privacy and security.

Is there a file-size or page-count limit?

There are no file-size or page-count limits. However, the maximum file size is constrained by your browser’s memory limits, typically around 1 GB for modern browsers like Chrome and Firefox.

Does this work on mobile?

Yes, the PDF Watermarker works on mobile devices, including smartphones and tablets, as long as they support modern web technologies like pdf-lib 1.17.1 and PDF.js 3.11.174.

Can I add an image watermark with a transparent background?

Yes, you can add image watermarks with transparent backgrounds. Ensure your image is in PNG or JPEG format with an alpha channel for transparency.

Can I apply a watermark to only some pages?

Yes, you can apply watermarks to specific pages by selecting the desired page range in the tool’s settings.

Can I adjust the opacity, rotation, and position?

Yes, you can adjust the opacity, rotation, and position of the watermark to fit your needs, ensuring the watermark is placed exactly as desired on your PDF document.

Related Tools

PDF Editor — broader edits beyond watermarks; Sign PDF — add a signature instead of a watermark; Add Page Numbers — add numbers to pages.