Add Watermark to PDF
Stamp custom diagonal text on every page of a PDF. Add CONFIDENTIAL, DRAFT, or any custom text watermark to your document.
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How to Add Watermark to PDF
Drag & drop or click the area above to select your PDF file.
Your file are securely uploaded and processed on our server in seconds.
Save your result file. It's automatically deleted from our servers within 15 minutes.
Custom Text
Set any watermark text: CONFIDENTIAL, DRAFT, your company name, or any custom label.
3 Opacity Levels
Choose Light, Medium, or Dark opacity to control how prominently the watermark appears.
All Pages at Once
Watermark is applied to every page of the PDF in a single pass.
What Is a PDF Watermark?
A watermark is a text stamp printed diagonally across every page of a PDF, typically semi-transparent, used to indicate the status or ownership of a document. Common watermarks include "CONFIDENTIAL", "DRAFT", "DO NOT COPY", a company name, or a person's name to identify who received a document.
When to Use PDF Watermarking
- Mark confidential documents — Stamping "CONFIDENTIAL" on every page signals handling requirements to recipients.
- Draft review copies — Marking documents as "DRAFT" prevents unfinished versions being mistaken for final outputs.
- Attribution — Adding a company name or URL to shared PDFs establishes provenance and discourages unauthorised redistribution.
- Client copies — Watermarking with a client's name personalises a document and deters sharing outside the intended audience.
- Legal protection — Watermarking intellectual property or proprietary reports adds a visible deterrent to unauthorised use.
How the Watermark Is Applied
The watermark text is rendered on each page at 45° using PyMuPDF's text insertion engine. The font size scales proportionally with the page dimensions, and the opacity is controlled by a greyscale colour value. The watermark is added as a page content layer — it is visible but does not affect the underlying text, which remains searchable and selectable.
Frequently Asked Questions
Can the watermark be removed later?
The watermark is added as a content layer on each page. Removing it requires a full PDF editor with content editing capabilities. For casual protection, this is sufficient — but it should not be considered tamper-proof against someone with a professional PDF editor.
Does the watermark affect the original text?
No. The original text and content are unchanged. The watermark is a visual overlay. The underlying text remains searchable and selectable.
Can I choose the watermark colour?
Currently the watermark is rendered in greyscale. The opacity slider controls how dark or light it appears: Light, Medium, or Dark.
Is there a character limit for watermark text?
There is no strict limit, but shorter text (1-3 words) renders more cleanly. Very long text may wrap or appear crowded on smaller pages.
Are the files deleted after processing?
Yes — both the original and watermarked PDF are deleted within 15 minutes.