Choose a PDF, enter your watermark text, and adjust its size and opacity. Everything runs in your browser — nothing you upload here is sent to our server.
Your PDF is watermarked locally in your browser and is not uploaded to our server.
Max 50 MB. Password-protected PDFs are not supported.
Watermark Settings
Watermarked PDF
DownloadWhat This Tool Actually Does
The watermark text is drawn diagonally across the center of every page at the opacity you choose — text only, in this first version, not a logo or image overlay. Each page’s own actual size is used to center the text correctly.
FAQ
Can I add an image or logo watermark instead of text?
Not in this version — only text watermarks are supported today.
Is my file uploaded anywhere?
No. The watermark is applied entirely in your browser. Your file is never sent to our server.