PDF Branding and Protection • PrefillPDF API

Add Watermarks to PDFs with an API

Apply consistent text or image watermarks to documents without manually editing each PDF.

Updated·Jul 13, 2026

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What you can do with PDF Watermark API

Text Watermarks

Add labels such as Draft, Confidential, or Approved.

Image Watermarks

Apply logos and branded graphics to documents.

Consistent Placement

Use repeatable watermark positioning.

Automated Processing

Add watermarks inside your document workflow.

Bulk Ready

Process large groups of PDFs programmatically.

Document Control

Clearly identify document status and ownership.

How it works

1
Provide the PDF
Upload or reference the document to watermark.
2
Choose the watermark
Send text or an image and its placement settings.
3
Call the API
Run watermark processing from your application.
4
Receive the updated PDF
Download or distribute the watermarked document.

Common workflows

Confidential Documents

Mark sensitive PDFs before distribution.

Draft Contracts

Apply Draft labels during review.

Branded Reports

Add company logos to generated reports.

Approval Status

Stamp Approved or Pending on workflow documents.

Customer Previews

Protect preview copies before purchase or approval.

Bulk Archives

Add classification labels to stored PDFs.

Benefits

Protect sensitive documents

Maintain consistent branding

Automate document status labels

Avoid manual PDF editing

Process documents in bulk

Standardize watermark placement

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FAQ

Can I add text watermarks?

Yes. Common examples include Draft, Confidential, Approved, and customer-specific labels.

Can I add a logo watermark?

Yes. Use an image watermark for branding or document ownership.

Can I automate watermarking?

Yes. Call the API from your application, webhook, or workflow.

Can watermarks be used on many PDFs?

Yes. The endpoint can be incorporated into a bulk-processing flow.

Does watermarking replace the original file?

The API returns an updated PDF, allowing you to decide how the original and watermarked versions are stored.

Start using PDF Watermark API

Connect your PDF workflow to PrefillPDF and automate document processing from your application.