How to Add a Watermark to a PDF
A watermark protects and brands your documents — think Confidential, Draft or your company name across every page. KOIAE's Watermark PDF tool adds a text watermark to your PDF in seconds, for free.
How to add a watermark to a PDF
- Open the Watermark PDF tool. Go to the KOIAE Watermark PDF page.
- Upload your PDF. Drag and drop the document you want to mark.
- Type your watermark text. Enter the words you want stamped on each page.
- Download the watermarked PDF. Download your branded document.
Tips for the best results
- Use short text like CONFIDENTIAL or DRAFT for clarity.
- Watermarks help discourage unauthorised copying.
- Combine with Protect PDF for extra security.
Why use KOIAE Watermark PDF?
KOIAE Watermark PDF is completely free — there is no account to create, no watermark on your files and no daily limits for everyday use. Most processing happens right in your browser, so your documents stay private, and it works on any device from Windows and Mac to Android and iPhone.
Frequently asked questions
Can I watermark every page?
Yes, the watermark is applied across all pages.
Is it free?
Yes, and KOIAE adds no extra branding of its own.
Can I remove it later?
Keep an unwatermarked original — the watermark becomes part of the exported file.
Related tools: Protect PDF · Add Page Numbers · Merge PDF · All PDF tools