Skip to main content
KioTools
  • +100 Tools
  • 100% Free
  • 0 Pop-up Ads
  • No Sign-up
  • Runs locally

Related Tools

Add Page Numbers to PDF

Stamp page numbers with a live preview.

Sign PDF

Draw, type or upload a signature and place it on any page.

PDF Splitter

Pull a page range out of a PDF, or download single pages.

PDF Watermark & Redact

What is this tool?

The PDF Watermark & Redact tool has two modes. Redact mode lets you draw opaque boxes over parts of a page to visually cover text, numbers, or images before sharing. Watermark mode overlays repeated or centered text (like "DRAFT" or "CONFIDENTIAL") across the pages. Both run using client-side JavaScript in your browser.

When to use it

  • Blacking out account numbers, social security numbers, or addresses before sharing a document
  • Covering a signature or photo on a scanned ID before sending it elsewhere
  • Marking a document as "DRAFT," "SAMPLE," or "CONFIDENTIAL" before distribution
  • Adding a company name or copyright watermark to a PDF report
  • Preparing a redacted version of a contract for a wider audience

How to use it

  1. 1Open the tool and upload your PDF.
  2. 2Choose Redact mode to draw boxes over areas to black out, or Watermark mode to add overlay text.
  3. 3Adjust box placement and size, or set watermark text, opacity, and angle.
  4. 4Preview the result on each affected page.
  5. 5Apply the changes — the PDF is rebuilt in your browser.
  6. 6Download the finished file.

Frequently asked questions

Does redaction actually remove the underlying text, or just cover it visually?

The tool draws an opaque box over the selected area in the rebuilt PDF. For maximum safety, treat sensitive scanned images as the safest case, and always verify the exported file before sharing.

Can I add a watermark to every page at once?

Yes, watermark mode applies your chosen text and settings across all pages in a single pass.

Can I use both redaction and a watermark on the same document?

Yes, you can apply redaction boxes and a watermark in separate steps on the same file before downloading.

Is my document sent to a server for processing?

No. Both redaction and watermarking are done entirely in your browser.

Can I control how transparent the watermark is?

Yes, opacity is adjustable so the watermark can be subtle or bold depending on your needs.