Add a Text Watermark to PDF Pages

Stamp a diagonal text watermark across all PDF pages. Set custom text, opacity, and font size.

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How it Works

1
Upload the PDF to watermark
2
Enter watermark text and adjust opacity
3
Download the watermarked PDF

PDF Add Watermark limits by plan

Free is enough for most one-off jobs. Pro raises the file and batch caps; Pro + Media unlocks GB-scale streaming and unlimited duration.

See all plans

Free

No signup needed

File size: 2 MB
Pages per PDF: 50
Files per batch: 1

Pro

£7/mo — 50× larger files

File size: 50 MB
Pages per PDF: 500
Files per batch: 5

Pro + Media

Stream multi-GB files

File size: 500 MB
Pages per PDF: 2,000
Files per batch: 50

Larger files supported on Developer (5 GB CSV) and Enterprise (unlimited). All processing happens in your browser — files never reach a server.

Privacy Audit

0 bytes uploaded. PDF Add Watermark runs entirely in your browser using pdf-lib and pdfjs-dist. Your file stays on your device at all times. No data is sent to any server.

Frequently Asked Questions

Can I set watermark opacity?

Yes — adjust from nearly invisible (5%) to fully opaque (100%). Default is 15%.

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