How does Add Watermark to PDF work?

Stamp text across every page — diagonal, centred or tiled. Add your files above, adjust anything you want to change, and press the button. The result downloads straight to your device.

Are my files uploaded anywhere?

No. This tool runs entirely in your browser. Your files are read into memory, processed on your device, and discarded when you close the tab.

Do I need an account?

No. Every tool on FileTools360 works without signing up, and there is no watermark on the output.

What is the file size limit?

200 MB per file. Since everything runs locally, your device's available memory is the real constraint.

PDFLosslessRuns in your browser

Add Watermark to PDF

Stamp text across every page — diagonal, centred or tiled. The conversion is lossless — every pixel, sample or byte in the source is preserved.

On your deviceNever uploadedGone when you close the tabHow this works

Drop your files here

PDF · up to 200 MB each

or paste files from your clipboard

Ready when you are

Stamp text across every page — diagonal, centred or tiled. Everything happens in this tab; nothing is sent anywhere.

⌘K to search converters

How to use it

1
Add your files
Add Watermark to PDF works with PDF. Drop them in, browse for them, or paste from your clipboard.
2
Choose your options
Tune watermark text, position and opacity — or leave the defaults, which are sensible.
3
Run it and download
Press the button and save the result. Everything happens on your device, and nothing is uploaded.