Add Watermark draws the text you provide across every page using the selected style settings.
InputOne PDF and watermark settings
OutputA watermarked PDF
RequirementsOne readable PDF and non-empty watermark text are required. This is an existing document feature, separate from PDFHub’s developer panel.
Step-by-Step Instructions
Follow these essential instructions to achieve optimal results when using Add Watermark:
Upload a PDF and enter the text to stamp.
Choose font size, opacity, color, and angle.
Select Add Watermark.
Review every page for readability and placement before sharing.
Interactive Tutorial
Visual Step-by-Step Walkthrough
Follow these real interface screenshots captured directly from Add Watermark. Every step highlights the exact buttons, selections, and downloads. Click any screenshot or "Launch Fullscreen Viewer" to inspect in high resolution.
Step 1 of 7 Upload Drop Zone (#drop)
Open Add Watermark
What to do:
Open Add Watermark to stamp copyright notices, confidentiality tags, or company names.
What you will see:
The upload drop area accepts any PDF document.
Next:
Click to select or drag your PDF document into the workspace.
Tip:
Watermarks protect intellectual property and identify draft or confidential versions.
Step 2 of 7 File Browser (#fin)
Upload PDF Document
What to do:
Select your PDF document from your storage.
What you will see:
The document loads and total page count is displayed.
Next:
Enter the text you want stamped on the document.
Tip:
Watermarks are stamped across all pages uniformly in one pass.
Step 3 of 7 Text Input (#wtext)
Enter Watermark Text
What to do:
Type your custom watermark text (e.g. "CONFIDENTIAL", "DRAFT", or your company name).
What you will see:
The input updates and pre-renders the stamp text.
Next:
Configure the watermark visual styling below.
Tip:
Keep text concise (1-3 words) for the clearest diagonal stamp.
Step 4 of 7 Sliders (#fsize, #opacity, #angle)
Adjust Size, Opacity & Angle
What to do:
Set font size (e.g. 48pt), opacity slider (e.g. 25%), and diagonal angle (e.g. 45°).
What you will see:
Adjusting opacity ensures the watermark is clearly visible without obscuring underlying text.
Next:
Choose an opacity around 20-30% for readable documents.
Tip:
A 45-degree diagonal angle runs across the full body of the page for maximum security.
Step 5 of 7 Color Picker (#color)
Select Watermark Color
What to do:
Pick a color for your stamp (e.g. Gray, Red, or Blue).
What you will see:
Color options adapt to contrast effectively against white page backgrounds.
Next:
Select Red for urgent tags or Gray for subtle corporate branding.
Tip:
Semi-transparent red (#e53e3e) provides an unmistakable confidentiality warning.
Step 6 of 7 Action Button (#goBtn)
Click Add Watermark
What to do:
Click the primary "Add Watermark" button.
What you will see:
The client-side engine embeds semi-transparent vector text over each page canvas.
Next:
Wait for the preview viewer to render.
Tip:
The watermark is baked into the document graphics state.
Step 7 of 7 Preview Section & Download (#generatedPreview, #dlModal)
Review Stamped Pages & Download
What to do:
Inspect the watermarked pages in the preview viewer, then click "Download".
What you will see:
The preview displays your diagonal watermark stamped across the pages.
Next:
Click Download to save the watermarked PDF to your device.
Tip:
Your protected document is now ready for safe distribution.
Tips & Best Practices
Use low opacity when the underlying content must remain readable.
Test on a copy before applying a mark to an important source.
Common Mistakes to Avoid
Using text that covers critical content.
Forgetting that the mark is applied to every page.
Troubleshooting & FAQ
If the text is hard to see, increase opacity or choose a contrasting color.
If the output fails, retry with a readable unencrypted PDF.
Frequently Asked Questions
Can I watermark only selected pages?
The current tool applies it to every page.
Does PDFHub add developer branding as a watermark?
No. User-entered watermark text is the only watermark feature.