Watermark PDF Online Free

Stamp text, a logo image, or both on every page. Private in your browser.

Drop a PDF file here

Your files never leave your browser

Use this free PDF watermark tool to mark documents with text or your logo. Adjust opacity and position, then download — no upload to our servers.

How to Watermark a PDF

Upload PDF

Drop or select the PDF you want to stamp.

Choose text or logo

Enter text, upload a PNG/JPG logo, or use both. Set opacity and position.

Download

Apply and save the watermarked PDF — free, no email.

Frequently Asked Questions

Is it free to watermark a PDF?

Yes. Site95 Watermark PDF is free with no signup, no account, and no Site95 branding on your file — only the text or logo you choose.

Do my files upload to a server?

No. Watermarking runs entirely in your browser with pdf-lib. Your PDF and logo never leave your device.

Where is the watermark placed?

Text uses a center diagonal stamp (classic CONFIDENTIAL / DRAFT style). Logos use the bottom-right corner, upright. In Text + logo mode, both standards are applied together.

Can I make a diagonal “CONFIDENTIAL” stamp?

Yes — that is the default for text. Enter your text, keep Diagonal on, set opacity (e.g. 25–40%), and apply to all pages.

Can I use an image logo as a watermark?

Yes. Choose Image / logo, upload a PNG, JPG, WebP, or GIF. By default the logo sits bottom-right. You can also apply text and a logo together.

Will the watermark reduce PDF quality?

Text is drawn as vector text. Logos are embedded as images. Your original page content is not re-compressed.