Watermark / Stamp PDF
Stamp text (COPY, CONFIDENTIAL…) or an agency logo onto every PDF page, right on your machine. Files never leave your device.
Everything runs on your machine — no file is uploaded to any server
Watermarking a PDF lets you add text stamps (COPY, ORIGINAL, CONFIDENTIAL, DRAFT…) or your agency logo onto every page of a document — marking its status and preventing misuse.
The tool renders Vietnamese text with diacritics right on your device, so there are no font issues, and it lets you pick a diagonal, tiled, or centered style with any opacity you like. Everything runs right in your browser on your device — your files are never uploaded to a server, it's free, and it fully supports Vietnamese.
How to stamp / add a watermark to a PDF file
- 1Upload your PDF
Choose the PDF file you want to watermark.
- 2Choose a text stamp or logo
Type the stamp text (e.g. COPY, CONFIDENTIAL) and pick a color, or upload your agency logo.
- 3Adjust the style & stamp
Pick a diagonal, tiled, or centered style and the opacity, click Watermark, then download your file.
Frequently asked questions
Will Vietnamese text with diacritics (COPY, CONFIDENTIAL) have font issues?
No. The tool renders the text right on your device, so all Vietnamese diacritics display correctly, independent of the fonts in the PDF.
Is my PDF file uploaded to a server?
Everything runs right in your browser — your files are never uploaded to any server, keeping them completely private.
Does watermarking make the file much bigger?
Not noticeably. The stamp is embedded once and reused on every page, so the file size increases very little.