Add Watermark to PDF Online Free
Add a text watermark to every PDF page directly in your browser with PDFKitLab. Customize the watermark text and create a new watermarked PDF without requiring a desktop PDF editor.
Watermark PDF Online
Add a light diagonal text watermark to every page of a PDF and download the new document directly from your browser.
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How to Watermark a PDF in 4 Easy Steps
Select a PDF
Choose the PDF you want to mark.
Enter watermark text
Use a label such as Confidential, Draft, Sample, Internal Use, or Review Copy.
Choose the text size
Select the available watermark size and review the processing options shown by the tool.
Download the watermarked PDF
Start processing and save the newly generated PDF to your device.
Why Add a Watermark to a PDF?
Watermarks can help communicate document status or ownership. Common labels include Confidential, Draft, Sample, Internal Use, and Review Copy.
PDFKitLab adds a light diagonal text watermark to each page. The current browser-based implementation uses a standard PDF font and does not rasterize the original page into an image.
Client-Side PDF Watermarking
PDFKitLab is designed for browser-based PDF processing. Where client-side processing is used, the core watermark operation takes place in your browser instead of requiring the PDF to be uploaded to a remote processing server.
Processing requirements vary according to PDF size, page count, browser capabilities, and device memory.
Why Use PDFKitLab for Watermarking?
Custom Text
Enter the watermark wording you need, subject to the tool's current character limit.
Three Text Sizes
Choose small, medium, or large watermark text.
Local Processing
The core watermark operation runs in your browser.
Clean Output
No promotional watermark is added by PDFKitLab itself.
Privacy and Security
The core browser-based watermark operation does not require uploading the PDF to a PDFKitLab watermark server. Your original PDF remains available on your device, while the processed document is generated as a separate output file.
What Is a PDF Watermark?
A PDF watermark is text or other visual information added to a document to communicate status, ownership, or handling instructions. Examples include Confidential, Draft, Sample, and Internal Use.
PDFKitLab's current watermark tool adds text to each page rather than converting the original page into a raster image.
When to Add a Watermark to a PDF
Confidential Documents
Mark documents with a visible Confidential label when appropriate.
Draft Documents
Use a Draft or Review Copy label to distinguish working documents.
Sample Files
Add Sample text when sharing a document as an example.
Internal Documents
Use Internal Use text to communicate intended document handling.
Frequently Asked Questions
Can I choose the watermark text?
Yes. Enter your own text, up to the tool's current character limit.
Is the watermark added to every page?
Yes. The current tool applies the watermark to every page.
Can I use it for confidential documents?
The core operation is browser-based and does not require uploading the PDF to a PDFKitLab watermark server.
Will the original PDF page become an image?
No. The watermark is added as PDF text rather than converting the page to a raster image.
Can I remove an existing watermark?
No. This tool adds a new watermark; it does not remove watermarks already embedded in a PDF.
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