PDF guide
How to add a watermark to a PDF
To add a watermark to a PDF, open File Studio's PDF Watermark tool, drop in the document, type your text (for example CONFIDENTIAL or DRAFT) or choose a logo image, adjust its position and opacity, and save. The watermark is stamped locally, so sensitive drafts never leave your computer.
By Ayush Soni · Updated October 21, 2026
Step by step
- 1
Open File Studio and choose PDF, then Watermark
Drop in the PDF you want to mark.
- 2
Choose text or a logo
Type a short label like CONFIDENTIAL, or pick an image such as your company logo.
- 3
Adjust the look
Set the position, size, and opacity so the watermark is visible without hiding the content.
- 4
Save the watermarked PDF
File Studio writes a new file and keeps the original clean.
Try File Studio free
Every tool runs locally on Mac and Windows. No uploads, no account.
FAQ
Frequently asked questions
Can I watermark images too?
Yes. File Studio has a separate image Watermark tool for JPG, PNG, and WebP files.
Can someone remove the watermark?
A determined person with a PDF editor can remove almost any watermark. Flatten the PDF afterwards to make it harder.
Does it work offline?
Yes. Watermarking runs entirely on your device with no upload.
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