Add Watermark to PDF Free Online
Stamp any text onto every page of your PDF — CONFIDENTIAL, DRAFT, DO NOT COPY, or any custom message. Choose colour and opacity. Free, instant, no sign-up.
Drop your PDF here to watermark
or click to browse — PDF files only
Three simple steps
No software, no account, no wait.
Upload Your PDF
Drag and drop your PDF file into the upload area. Files up to 100 MB are supported.
Set Watermark
Enter your watermark text, choose a colour, and set the opacity (0 = invisible, 1 = fully opaque). 0.3 is typically ideal.
Download Watermarked PDF
Click Add Watermark. Every page of your PDF is stamped and the file downloads instantly.
Frequently asked questions
Upload your PDF, enter the watermark text (e.g. CONFIDENTIAL), choose a colour and opacity, then click Add Watermark. The stamped PDF downloads immediately — no sign-up required.
Yes — enter any text up to 60 characters. Common watermarks include CONFIDENTIAL, DRAFT, DO NOT COPY, FOR REVIEW, or your company name.
0.3 (30%) is the most common watermark opacity — visible but not overpowering. Use 0.1-0.2 for a very subtle stamp, or 0.5+ for a strong visible mark.
Yes — the watermark is applied diagonally across every page in the PDF at the same position, size and opacity.
Watermarks added this way are merged into the page content. They can be removed with advanced PDF editing software (Adobe Acrobat Pro) but not with simple tools.
Add Watermark to PDF Free Online
Protect your documents before sharing. A watermark on every page deters unauthorised copying and distribution of confidential reports, contracts, and design proofs.
Best Watermark Settings
For confidential business documents, use red or dark grey text at 25-35% opacity. For draft documents, use blue or grey at 20-30% opacity. For copyright protection, use black at 15-25% opacity so text remains readable.
Watermark vs Password Protect
A watermark visually marks your document but does not prevent opening or copying. For stronger protection, combine a watermark with PDF password protection. Use watermarks for deterrence; use passwords for access control.
Common Watermark Uses
Marking confidential reports before sharing with clients. Stamping DRAFT on documents under review. Adding company name to design proofs. Marking invoices as PAID. Adding DO NOT COPY to sensitive contracts.