Watermark PDF
Local Processing (Offline Capable)Add a text or image (PNG/JPG) watermark to PDF, tiled or on a nine-position grid, with rotation, font size, color, opacity and page range.
How this tool works (no sign-up needed)
- Upload your file above. Each tool shows whether it runs Local (in your browser) or Cloud (encrypted servers).
- Adjust options, then click the Run / Convert / Process button.
- Wait for progress, then download the result. Use Next tools to continue.
If buttons are not visible, enable JavaScript — the interactive workspace loads in your browser.
Free · Local processingFiles never leave your browser — watermark locally; batch supported
Supports application/pdf
Advanced options
Local — your file is processed in your browser and not uploaded to us. No account needed.
What is it?Watermark PDF is a PDFLean security & privacy tool: Add a text or image watermark with tiled or nine-grid placement, rotation, font size, color, opacity and page range.
TL;DR: Add a text or image watermark to PDF, tiled or on a nine-position grid, with rotation, font size, color, opacity and page range. Everything runs locally in your browser — your file is never uploaded; It handles files up to 10MB.
Measured: ~60 ms median on a typical sample — full benchmark table below.
About this tool
Designed for the moment you need a document changed quickly and privately. Add a text or image watermark to PDF — tiled or placed on a nine-position grid, with rotation, font size, color, opacity and page range. Processing runs locally in your browser's memory — the document is never transmitted, and closing the tab clears it completely. The workflow is deliberately short: load the file, choose the options on the page, run the operation, and save the result. Every choice is applied before the file is written, so re-running with different settings takes seconds. practical limits apply (files up to 10MB); it pairs well with the related tools linked beside this page when one step is not the whole job. Key facts — Processing: runs entirely in your browser, client-side; Access: free with no account required; File limits: files up to 10MB; Privacy: the file never leaves the device.
Measured performance benchmarks
| Sample | Input | Output | Median time | Size change |
|---|---|---|---|---|
| Tiled text watermark on 60 pages | 160 KB | 254 KB | 60 ms | +59% |
Measured locally in your browser (isomorphic production code; samples are programmatically generated text PDFs, median of 5 runs). Real-world image-heavy PDFs differ — see the on-page limits.
How to use
Upload PDF files (batch selection supported)
Choose a text watermark or an image watermark (PNG/JPG)
Pick single placement on the nine-position grid or full-page tiling; adjust rotation, font size, color and page range under Advanced options
Click "Add watermark" to apply and download
FAQ
Will my file be uploaded?
No. Everything runs locally in your browser — your file is never uploaded.
Are there any limits?
It handles files up to 10MB; watermark text is limited to 60 characters and supports Latin letters, numbers, and symbols (Chinese not currently supported); image watermarks accept PNG (transparency preserved) and JPG.
What watermark styling options are supported?
Text (up to 60 characters) or image watermarks; opacity from 1% to 80%; single placement on a nine-position grid or full-page tiling; rotation (default -45°, customizable), font size, color (presets plus custom) and page range (e.g. 1-3,5).
Can I process multiple files in bulk?
Yes. You can select multiple PDF files at once on this page to watermark them sequentially, producing a new watermarked PDF for each file. For large-scale multi-step automation, use the Batch Processing workflow.
Is the processed file still editable?
Yes. Watermarking is a standard document edit. The output PDF remains a standard document that can be viewed, printed, or further processed with other tools (such as merge or split), and your original file remains untouched.