PDF Watermark, Page Numbers, Metadata Editor

Q: Are my PDFs uploaded?

No. All processing runs in your browser via pdf-lib (WebAssembly). The site operator cannot see your PDF content.

Q: Is the watermark applied to all pages?

Yes. In watermark mode, every page gets the same watermark. Configurable text, position, rotation, and opacity.

Q: Can I customize page number format?

Yes. 4 formats: '1' (simple) / '1 / 10' (fraction) / 'Page 1 of 10' / '- 1 -' (dashes). 6 position options.

Q: Why does metadata matter?

Title, author, and keywords appear in PDF viewer tabs, search, and document management. A PDF with title 'Untitled' or unknown author looks unprofessional. Standardize for cleanliness.

Q: Can I set a PDF password?

Password encryption is NOT supported (limitation of static-site PDF encryption libraries). Use Adobe Acrobat or a desktop tool for password protection.

3-in-1: add watermark, insert page numbers, edit title / author / keywords.

Your PDFs are not uploaded to any server. All processing runs in your browser via pdf-lib (WebAssembly).

Drag-drop PDF or click to select

Multiple PDFs supported

Common use cases

Situation	Recommended mode
Internal document security marking	Watermark "CONFIDENTIAL"
Quote / contract draft	Watermark "DRAFT"
Resume / portfolio page numbers	Page numbers "1 / N" bottom center
Legal documents, evidence	Page numbers "Page 1 of N" + watermark
Clean up unknown-author PDF	Metadata → set title / author
Standardize company portfolio PDFs	Metadata → unify author as company name

Related tools

Frequently asked questions

Are my PDFs uploaded?

No. All processing runs in your browser via pdf-lib (WebAssembly).

Is the watermark applied to all pages?

Yes. Every page gets the same watermark. Configurable text, position, rotation, opacity.

Can I customize page number format?

4 formats: 1 / 1 / 10 / Page 1 of 10 / - 1 -. 6 position options.

Why does metadata matter?

Title / author / keywords appear in viewer tabs, search, document management. 'Untitled' or unknown author looks unprofessional.

Can I set a PDF password?

Password encryption is NOT supported (limitation of static-site PDF encryption libraries). Use Adobe Acrobat or a desktop tool.

References

Last verified: 2026-05-10 / pdf-lib (MIT) WebAssembly library.

pdf-lib (MIT) — GitHub
PDF 1.7 standard — ISO 32000-1

⚠️ Some PDF viewers may show slight position differences after watermark / page numbers. Verified against Adobe Acrobat and Chrome PDF viewer.