Add a watermark to PDF Online
Add a watermark to your PDF file online in seconds. This tool overlays text or an image across every page of a PDF. PDF is a format where file size usually comes from embedded images (scanned pages, high-res photos) rather than the text content itself. No software installation required — everything runs in your browser.
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Why Add Watermarks to PDFs?
This tool overlays text or an image across every page of a PDF. It matters because draft documents, copyrighted material, and confidential files often need a visible marker to prevent them from being mistaken for a final or unauthorized copy. It's a particularly common need for PDF, since PDF is a format where file size usually comes from embedded images (scanned pages, high-res photos) rather than the text content itself.
PDF files don't handle this natively without dedicated software — this tool overlays text or an image across every page of a PDF directly in your browser instead, accounting for the fact that PDF is a format where file size usually comes from embedded images (scanned pages, high-res photos) rather than the text content itself.
Draft documents, copyrighted material, and confidential files often need a visible marker to prevent them from being mistaken for a final or unauthorized copy — which is exactly the situation this tool is built for. Worth knowing: PDF is a format where file size usually comes from embedded images (scanned pages, high-res photos) rather than the text content itself.
How to Add a Watermark
- 1
Upload your PDF file.
- 2
MiConvert processes it: overlays text or an image across every page of a PDF.
- 3
Download the result.
- 4
Use it directly — no further conversion needed.
Key Features
- Add a watermark tos PDF files directly in your browser, accounting for the fact that PDF is a format where file size usually comes from embedded images (scanned pages, high-res photos) rather than the text content itself
- Fast turnaround, typically under a minute per file
- Accounts for how PDF actually behaves: a format where file size usually comes from embedded images (scanned pages, high-res photos) rather than the text content itself
- No software installation required — everything runs in the cloud
- Free for files up to 50MB, 100MB for registered accounts
Frequently Asked Questions
Do I need any software installed to add a watermark to my PDF file? ▼
No — this runs entirely on our servers, no desktop software installation required, regardless of the fact that PDF is a format where file size usually comes from embedded images (scanned pages, high-res photos) rather than the text content itself.
How long does this take? ▼
Most files process in 10-30 seconds; larger or more complex files can take up to a minute.
What does this tool actually do to my PDF file? ▼
It overlays text or an image across every page of a PDF. Relevant here because PDF is a format where file size usually comes from embedded images (scanned pages, high-res photos) rather than the text content itself.
Is this free to use? ▼
Yes — free for files up to 50MB, with a 100MB limit for registered accounts, no subscription required.
Is there a file size limit? ▼
Free processing handles files up to 50MB; registered accounts get up to 100MB.