How to Add a Watermark to PDF Online for Free
PDFico adds text watermarks to every page of your PDF entirely in your browser. No files are uploaded to any server and no software needs to be installed. The process is fast and gives you full control over the appearance of your watermark. Here is how to use the tool:
- Step 1: Upload your PDF — Click "Choose PDF File" or drag and drop your document onto the page. The file stays on your device throughout the entire process.
- Step 2: Enter your watermark text — Type the text you want to appear on every page. Common choices include CONFIDENTIAL, DRAFT, DO NOT COPY, SAMPLE, or your company or personal name.
- Step 3: Adjust the appearance — Set the font size to control how large the watermark appears. Use the opacity slider to make the text subtle or prominent. A low opacity like 0.10 to 0.15 keeps the watermark visible without obscuring the underlying content.
- Step 4: Choose rotation and colour — Select a rotation angle to position the watermark diagonally, horizontally, or vertically across the page. Pick a colour that contrasts with your document content while remaining professional.
- Step 5: Apply and download — Click "Add Watermark" and download your watermarked PDF. The watermark is applied to every page of the document.
Common Use Cases
Adding watermarks to PDFs serves several important purposes across different industries and situations:
- Marking draft documents — Add a "DRAFT" watermark to contracts, proposals, or reports that are still under review. This clearly signals to readers that the document is not final and may change before approval.
- Protecting confidential information — Stamp financial reports, employee records, or internal memos with "CONFIDENTIAL" to remind recipients that the content should not be shared outside the intended audience.
- Branding shared documents — Add your company name or logo text to proposals, whitepapers, and marketing materials that you distribute to clients or partners. This reinforces your brand on every page.
- Deterring unauthorised copying — A visible watermark across each page discourages people from passing off your work as their own. This is especially useful for creative professionals sharing previews of designs, photographs, or written content.
- Identifying document versions — Use watermarks like "REVIEW COPY" or "VERSION 2" to help teams track which version of a document they are reading, reducing confusion during collaborative editing.
Frequently Asked Questions
Can the watermark be removed after it is added?
The watermark is embedded directly into the PDF content. While it is technically possible for someone with advanced PDF editing tools to remove it, a visible watermark serves as an effective deterrent against casual copying and clearly communicates the document's status.
Will the watermark cover up the text in my document?
Not if you use a low opacity setting. The default opacity of 0.15 creates a semi-transparent watermark that is clearly visible but does not prevent readers from reading the underlying text. You can adjust the slider to find the right balance for your document.
Does the watermark appear on every page?
Yes. The watermark is applied consistently to every page of the PDF. This ensures complete coverage whether the document is one page or one hundred pages long.
Can I add a watermark to a scanned PDF?
Yes. The watermark tool works with all types of PDFs, including scanned documents, digitally created files, and PDFs with mixed content. The text watermark is placed as an overlay on top of whatever content exists on each page.
Tips and Best Practices
- Keep opacity between 0.10 and 0.20 for readability — This range makes the watermark clearly visible while keeping the document content easy to read. Higher opacity values can make dense text difficult to follow.
- Use diagonal rotation for full coverage — A diagonal watermark at -45 degrees stretches across the entire page, making it harder to crop out compared to horizontal or vertical placement.
- Choose gray for professional documents — Gray watermarks look professional and work well on documents with both black text and colour graphics. Red is better suited for urgent or warning-level markings.
- Match font size to page content — For text-heavy documents, a larger font size (60-80pt) ensures the watermark remains visible. For image-heavy documents, a smaller size (30-48pt) may be sufficient.
- Preview before distributing — Open the watermarked PDF and scroll through several pages to confirm that the watermark looks correct and does not interfere with important content like signatures or form fields.