Add Watermark to PDF - Free & Private

Stamp a text watermark like CONFIDENTIAL or DRAFT on every page of your PDF. Choose size, color, angle, opacity, and position. Processed entirely in your browser.

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Click to select a PDF file

Your file stays on your device.

Watermark PDF documents in your browser

This tool stamps a text watermark such as CONFIDENTIAL, DRAFT, or a company name onto the pages of any PDF. You control the font size, color, opacity, rotation angle, and placement: centered, repeated as a tiled pattern, or in all four corners. A live preview of the first page shows exactly how the watermark will look, and the finished file downloads instantly without ever being uploaded.

Watermarks are everyday practice in legal, HR, and finance work. Law firms mark draft agreements before circulation, HR teams stamp SAMPLE on policy templates, freelancers protect proposal PDFs sent to prospects, and accountants label preliminary financial statements. A page range option lets you watermark only specific pages, for example just the appendix of a longer report.

Technically the tool uses pdf-lib to draw the text directly into each page's content stream with your chosen opacity and rotation, while pdf.js renders the preview. The default diagonal angle of minus 45 degrees is the classic watermark orientation because it crosses the reading direction and stays visible over both text and images without making the page unreadable.

For a subtle mark that does not distract from content, an opacity between 15 and 30 percent works well; for a hard deterrent on shared drafts, 40 to 60 percent at 60 to 90 points is common. Keep in mind that a visible watermark is a labeling and deterrence measure, not security: it does not encrypt the document or prevent copying.

Watermarking pairs naturally with the other ToolForte PDF utilities. Combine several stamped files into one document with the PDF Merge tool, or fix sideways scans first with the Rotate PDF tool before adding your mark. Everything runs locally in your browser, so confidential files never touch a server, there are no file size limits imposed by an upload queue, and the tool keeps working even on a flaky connection once the page has loaded.

How the PDF Watermark Tool Works

  1. 01Select a PDF file. The first page is rendered locally as a live preview.
  2. 02Type your watermark text and adjust font size, opacity, rotation angle, and color until the preview looks right.
  3. 03Choose a position: centered, tiled across the page, or repeated in all four corners, and optionally limit it to a page range.
  4. 04Click the button to stamp every targeted page and download the watermarked PDF.

Choosing Effective Watermark Settings

A good watermark is visible enough to do its job and light enough not to obstruct the content. For status labels like DRAFT or CONFIDENTIAL, the classic setup is large text at 60 to 90 points, the default diagonal angle of minus 45 degrees, and opacity between 15 and 30 percent in gray or red. The diagonal crosses the reading direction, so it stays noticeable over both text and images. For branding, a smaller mark in the corners at low opacity keeps documents professional without shouting. The tiled mode repeats the text in a grid and is the strongest deterrent against casual re-sharing of preview documents, because cropping cannot remove it. Use the page range field when only part of a document needs marking, for example stamping SAMPLE on the appendix of a proposal while leaving the cover clean. Preview updates happen live on the first page, and the same geometry is applied to every page in range when you download. Remember that a visible watermark labels a document but does not protect it technically: anyone with a PDF editor can attempt removal, so treat it as communication and deterrence, not encryption.

When to Use the PDF Watermark Tool

Use it whenever a document's status or ownership needs to be unmistakable: marking contracts as DRAFT before legal review, labeling proposals and price lists as CONFIDENTIAL, stamping SAMPLE on templates you share publicly, or adding a company name to reports that will circulate outside your organization. Freelancers watermark portfolio PDFs and unpaid deliverables, teachers mark exam copies, and agencies stamp client previews. Because everything runs locally in your browser, it is safe for sensitive files that must not touch third-party servers.

Common Use Cases

  • Stamping DRAFT or CONFIDENTIAL across contracts and internal reports before distribution.
  • Adding SAMPLE to templates, worksheets, and preview documents shared with prospects.
  • Branding proposals and deliverables with a company name before merging them into one package. Merge PDF Files Online - Free & Instant
  • Marking scanned documents after fixing their orientation, all without uploading anything. Rotate PDF Online - Free & Private

Expert Tips

  • Keep opacity at 30 percent or lower for documents people actually need to read; save higher opacity for hard deterrents.
  • Use the tiled position for preview copies you do not want reused: unlike a single centered mark, a tile grid survives cropping.
  • Red communicates warning status like CONFIDENTIAL, while light gray works best for neutral labels like DRAFT or COPY.

Frequently Asked Questions

Can I watermark only certain pages?→
Yes. Use the page range field with values like 1-3, 5, 8 to target specific pages. Leaving it empty stamps every page in the document.
Will the watermark appear behind or in front of the content?→
The watermark is drawn on top of the page content. With a low opacity setting, typically 15 to 30 percent, the underlying text remains fully readable while the mark stays visible.
Can a watermark be removed later?→
A visible watermark deters misuse and communicates status, but it is not tamper-proof. Someone with PDF editing software can attempt to remove it, so do not rely on it as a security measure.

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