100% Free In-browser Custom text

Watermark PDF Free Online

Add a text watermark to every page of your PDF. Customize font size, opacity, rotation angle, and position. Browser-only, zero uploads.

Drop a PDF here or click to browse

Upload PDF • Set watermark text • Download stamped PDF

Related tools: Protect PDF Page Numbers Watermark Image Merge PDF

Dead simple

How to watermark a PDF

1

Upload your PDF

Drag and drop or click to select your PDF file. Any page count is supported.

2

Customize watermark

Enter your text, set font size, opacity, rotation, color, and position. All changes are instant.

3

Download watermarked PDF

Click "Add Watermark" and download the stamped PDF. Every page carries the watermark.

Why JustDownSize

Stamp PDFs without uploading

Watermarking in other tools means your contract or report goes to a third-party server. JustDownSize adds the watermark directly in your browser using PDF-lib's text rendering — your document stays private from start to finish.

100% Private
Files never uploaded
Fully customizable
Text, size, opacity, angle

Use cases

Marking drafts

Add "DRAFT" or "NOT FINAL" to prevent unauthorized distribution of work-in-progress documents.

Confidentiality marking

Stamp "CONFIDENTIAL" on contracts and legal documents before sharing with parties who shouldn't redistribute them.

Branding and copyright

Add your company name, website URL, or copyright notice to PDFs you share publicly to protect intellectual property.

Got questions?

Frequently asked questions

Yes, completely free. No account, no page limits, no restrictions on watermark text.

The watermark is embedded as text in the PDF page content. It can be removed by someone with advanced PDF editing tools (like Adobe Acrobat Pro), but it prevents casual redistribution and signals document status clearly.

Yes. The watermark is applied to every page in the PDF with the settings you choose — same text, opacity, rotation, and position throughout the document.

30% opacity is a good starting point — visible enough to mark the document without obscuring the content beneath. Use 50–70% for a stronger watermark that's harder to ignore.

Yes. The watermarking runs entirely in your browser using PDF-lib. Your PDF is never uploaded to any server.

This tool adds text watermarks. For adding a logo or image watermark to a photo, use our Watermark Image tool.