Watermark PDF
π Private by design: your PDF is processed entirely in your browser. Files never upload anywhere.
How to Use the Watermark Tool
Choose your PDF, pick text or image mode, and click Add Watermark. For text, type your label (CONFIDENTIAL, DRAFT, SAMPLE and DO NOT COPY are popular), choose a font, size and color, and set the opacity. For image mode, upload your logo PNG or JPG and choose how large it should appear. The tool stamps every page and gives you a download link within seconds.
Text watermarks are drawn diagonally at 45 degrees across the center of each page, the classic confidential stamp look. If your text has multiple lines, each line is drawn below the previous one along the same diagonal. Image watermarks are centered and scaled to your chosen fraction of the page width, keeping the original aspect ratio so logos never stretch.
When to Watermark a PDF
Watermarks communicate document status at a glance. DRAFT marks work in progress so nobody mistakes it for final. CONFIDENTIAL marks sensitive material and reminds readers to handle it carefully. SAMPLE marks preview copies of designs, photos or reports shared before payment. These labels travel with the file, so the warning survives forwarding, printing and screenshots.
Image watermarks serve branding and ownership. Photographers stamp proofs, agencies stamp mockups, and companies stamp templates so their work is credited wherever it appears. A semi transparent logo across the page deters casual misuse while still letting the recipient evaluate the content. For the strongest effect, pair watermarking with sensible sharing: send low resolution or flattened copies when the risk is high.
Quality and Privacy Details
Text watermarks use the standard built in PDF fonts, so they render identically in every viewer without adding font data to your file. The 45 degree rotation and center placement are computed from the actual text width, so the mark sits truly centered on every page regardless of page size. Image watermarks embed your uploaded graphic once and reuse it on every page, keeping the output efficient.
Privacy is built in. Watermarking happens entirely in your browser with JavaScript, so your document and your logo image are never uploaded to a server or visible to anyone else. The original file is never modified: the tool always creates a new watermarked PDF, leaving your source document exactly as it was. This local only approach is ideal for unreleased designs and internal drafts.
Frequently Asked Questions
What is the difference between a text and an image watermark?
A text watermark stamps words like CONFIDENTIAL, DRAFT or DO NOT COPY diagonally across each page in your chosen font, size and color. An image watermark places your own uploaded graphic, such as a company logo, centered on every page instead. Text watermarks are best for status labels, while image watermarks are best for branding. Both support opacity control so the mark stays visible without hiding the content underneath.
How does the opacity slider work?
Opacity controls how see through the watermark is, from 10 percent (very faint) to 100 percent (fully solid). Around 20 to 30 percent is the sweet spot for most documents: clearly visible but easy to read through. Lower values suit subtle branding, while higher values suit strong warnings on sensitive drafts. The preview description updates as you move the slider so you can judge before downloading.
Will the watermark cover my text?
The watermark is drawn centered on each page, so it will overlap content by design. That is why opacity matters: at 25 percent opacity your text remains fully readable through the mark. Text watermarks are also rotated 45 degrees and can span the full page width, which spreads the mark thinly instead of concentrating it in one spot. Always check the downloaded result and adjust opacity if readability suffers.
Can I watermark only some pages?
This tool applies the watermark to every page for consistency, which is the standard behavior for status stamps like CONFIDENTIAL. If you need different marks on different pages, split the PDF into parts, watermark each part separately, and merge them back together. Keeping one mark across the whole document also avoids confusion about which pages carry the warning.
Does watermarking make my PDF secure?
A watermark is a visual deterrent, not a security feature. It marks the document visibly but does not prevent copying, editing or redistribution, and a determined person can remove it with PDF editing software. For real protection, combine watermarking with password protection or restricted sharing. Think of the watermark as a label that travels with the document, not a lock.
Is my PDF uploaded to a server?
No. Your file never leaves your device. The PDF is read and watermarked entirely inside your web browser using JavaScript, so nothing is uploaded, stored or seen by anyone else. Your uploaded logo image also stays local and is only embedded into the output file. This makes the tool safe for sensitive documents such as unreleased designs and internal drafts.