PDF tools · Free browser tool
Stamp, Number or Watermark a PDF
Add a visible text stamp, watermark, label, date, or page numbers to selected PDF pages locally, with position, opacity, size, and rotation controls.
Phone and computer friendly
No document upload
Free to use
Private workspace
Apply consistent document labels without uploading the PDF or relying on a remote template service.
Tab memory only
New output file
Review before sharing
Your file is processed by code already loaded in this tab. Your device, browser, extensions, downloads, and any later sharing remain part of the trust boundary.
Ready. Choose a file to begin.
Choose a file to begin
Apply consistent document labels without uploading the PDF or relying on a remote template service.
Created on this device
Result ready
Open the output and review every important page before replacing or sharing a file.
What this tool does
A focused PDF job, with a visible boundary.
Apply consistent document labels without uploading the PDF or relying on a remote template service.
Position and opacity controls
Selected-page application
Know the limits
Local does not mean unlimited.
Browser processing avoids an upload workflow, but available memory, PDF structure, digital signatures, and the settings you select still matter.
- A stamp is visible content, not an authenticity guarantee or digital signature.
- Editing invalidates prior signatures.
- Some viewers can edit newly added content unless the result is flattened separately.
Four local steps
How to use pdf stamp tool.
- 01
Choose an unencrypted PDF.
- 02
Enter the stamp or configure page numbering.
- 03
Choose pages, position, size, opacity, and rotation.
- 04
Apply the stamp and visually inspect the output.
Clear answers
PDF stamp tool questions.
Is a watermark tamper-proof?
No. It is a visible deterrent or label and can be altered by sufficiently capable software.
Can I number only selected pages?
Yes. Enter a page selection and choose the starting number.
Does stamping upload the PDF?
No. The new page content is added locally.