PDF Tools · Browser-based utility
Add Watermark & Page Numbers to PDF Online Free
Add a text watermark and/or page numbers across all PDF pages with adjustable size, opacity, rotation, position, numbering start, format and margins.
What this tool does
Add a text watermark and/or page numbers across all PDF pages with adjustable size, opacity, rotation, position, numbering start, format and margins.
People often describe this task with phrases such as watermark pdf, add page numbers to pdf, pdf watermark online and number pdf pages. This page uses those terms only where they refer to the same underlying function.
How to use the Add Watermark & Page Numbers to PDF
- Open the Add Watermark & Page Numbers to PDF page and select or enter the source data required by the tool.
- Review the available controls instead of accepting defaults blindly when the destination has a size, format, layout or compatibility requirement.
- Run the operation and inspect the preview, status or generated result before treating it as final.
- Download or copy PDF and verify it in the destination application, browser, viewer or workflow that will actually use it.
Use the interactive tool above for the actual operation. The documentation below explains what the controls mean, what changes in the file/data, and how to troubleshoot common results.
Settings and capabilities explained
| # | Control or capability |
|---|---|
| 1 | Watermark text |
| 2 | Watermark size |
| 3 | Opacity percentage |
| 4 | Rotation in degrees |
| 5 | Watermark position |
| 6 | Watermark color |
| 7 | Enable page numbers |
| 8 | Starting number |
| 9 | Page-number font size |
| 10 | Page-number position |
| 11 | Format: 1, Page 1, 1 / 10 or Page 1 / 10 |
| 12 | Edge margin in points |
Supported input and output
- Input: one PDF
- Output: decorated PDF
How it works technically
PDF is a page-description document format rather than a single raster image. Page-level operations can copy, reorder or decorate pages without requiring every page to become a bitmap.
A visible PDF watermark is drawn into page content and therefore becomes part of the rendered page.
Page-number formats can include the current page index and total page count.
Opacity and rotation affect watermark visibility while position and margin determine placement.
Common use cases
- Mark draft PDFs
- Add ownership text
- Number pages before printing
- Add page x of y numbering
- Brand a document packet
Choosing the right settings
- Use lower opacity for background-style watermarks.
- Keep page numbers away from existing headers/footers by adjusting position and margin.
Common problems and fixes
Watermark overlaps important text
Change position, rotation, size or opacity.
Page numbering starts at the wrong value
Set the starting number before exporting.
Browser processing and privacy notes
The source code for this build performs the documented file transformation or analysis from browser JavaScript/Web APIs, and the video tools load FFmpeg.wasm for media processing. The site also contains third-party analytics, font/CDN and advertising scripts that can make ordinary network requests. Therefore, the precise claim made here is limited to the tool routine: it does not need a separate AutoClip file-upload API in order to perform the documented local operation.
For sensitive files, you should still use your browser’s developer tools or network controls if you need to independently verify the behavior of every third-party request in your environment.
Frequently asked questions
What does the Add Watermark & Page Numbers to PDF do?
Add a text watermark and/or page numbers across all PDF pages with adjustable size, opacity, rotation, position, numbering start, format and margins.
What input and output does it use?
Input: one PDF Output: decorated PDF Outputs include PDF.
Do I need to install desktop software?
No desktop installation is required for this page. The interactive workflow runs from the web browser. Some advanced media features load browser-side JavaScript/WebAssembly libraries when needed.
Are selected files processed through the tool interface?
Yes. The implementation reads selected files with browser APIs and performs the documented transformation or analysis in the page. External libraries, analytics and advertising scripts may make their own network requests, so this statement is about the file-processing routine itself.
Watermark overlaps important text?
Change position, rotation, size or opacity.
Page numbering starts at the wrong value?
Set the starting number before exporting.