PDF Watermark
PDF Watermark exists to do one job well: add a diagonal text watermark. Pages are read and rewritten inside your browser with the PDF-lib engine, so the document never travels to a server and nothing is stored after you close the tab. It is used most by accountants and admin staff preparing invoices, statements and signed contracts. Handles standard PDF 1.4–1.7 files, including ones produced by Word, Google Docs, Canva and scanner apps. Free, unlimited, and free of the upsells most tools of this kind carry.
Key features
- Handles standard PDF 1.4–1.7 files, including ones produced by Word, Google Docs, Canva and scanner apps.
- Keeps the original page size, embedded fonts and image quality — no silent re-compression.
- Works on desktop, tablet and phone — no separate app to install.
- Built to do one job properly rather than twenty jobs badly.
How to use PDF Watermark
- Add your PDF: Drag the file onto the drop area, or click it to browse your device. Several files can be added at once where the tool supports it.
- Set the options: Choose page ranges, order or output settings. The preview updates so you can confirm before committing.
- Download the result: Press the action button and the finished PDF saves straight to your downloads folder.
Frequently asked questions
- Can PDF Watermark open a password-protected PDF? — Not while it is encrypted. Remove the password in the app that created the file first, then the tool can read it normally.
- Does PDF Watermark add a watermark? — Never. PDF Watermark produces a clean file with no branding, stamp or trial marking of any kind.
- Does PDF Watermark work offline? — Once the page has loaded, the processing itself runs locally — so a brief drop in connection while you work will not interrupt it.
- Does PDF Watermark upload my document anywhere? — No. PDF Watermark opens the PDF with JavaScript inside your own browser tab. The file is never sent to a server, which is why it also works with confidential contracts and medical or legal paperwork.