Add Watermarks to PDF for Free

Create and add custom watermarks to multiple PDF documents fast and easy.
Drag & Drop the File(s) Here

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File extension .pdf
Internet media type application/pdf
Description: PDF stands for Portable Document Format, that means it always looks the same on any screen. PDF is widely used in business sphere and at the same time is convenient to create and view various manuals, eBooks, brochures and other sorts of documents. PDF document can contain text, graphics, spreadsheets and other visual elements.
Technical Details: PDF extension combines three technologies. First is a subset of the PostScript page description programming language, for creating the layout and graphics. Second is font-embedding/replacement system to allow fonts to travel with the documents. Third, it is a structured storage system in which these elements and any related content are combined into one file with the appropriate data compression.
Developed by ISO
MIME Type: 15 June 1993
Useful links:


How-to guide

How to add a watermark to PDF online

  1. Open your preferred browser and go to
  2. Select a PDF file and simply drag and drop it to the website or upload a document from the cloud.
  3. Create a custom text or image watermark.
  4. Select where on the page(s) to add the mark (in the center, at the bottom, or in the corner).
  5. In one click you can begin adding watermark to pdf.
  6. Adjust the size of your mark and move it around until you’re happy with it.
  7. Download your secured document or start over again if needed.

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Split PDF
Merge PDF
Combine & Reorder
Extract Pages
Compress PDF
Rotate PDF
No software downloads
Cloud storage Unlimited No info No info
Price Free Free 7-Day Trial paid Free 7-Day Trial paid
Encryption and security
Support 24/7/365 No info
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How to Add Watermark PDF Files

Want to have a neat, easy to share, and cross-platform document? Use our web service and enjoy fast and high-quality conversion results.

How to add watermark to PDF online

A watermark is a digital mark (an image or text) embedded in PDFs, photos, illustrations, etc., that indicates authorship or ownership of the marked content. As a standard, it should be semitransparent and barely visible, but visible enough so that the content isn’t usable. If your text falls into the wrong hands, the mark will play a marketing and protective role in keeping your data secure and controlled by you. It helps potential customers identify and contact you as the author while keeping unauthorized users from editing the document. 

Go to and follow the quick steps to add watermark to PDF for free:

  1. Upload the image you need. 
  2. Click Add Watermark Now!.
  3. Choose the page you want to embed it in.
  4. Download your secured document.

The whole process won't take you more than five minutes (and that’s if you have a lot of pages to mark). With AltoAddWatermarktoPDF, you do not need to waste time registering an account. Use our reliable browser-based solution for protecting your documents online from copying by third-party resources. Apply your image/text, save the PDF and you’re DONE!

How to add watermark to PDF online


Launch AltoAddWatermarktoPDF in your preferred browser to start adding a watermark to your PDF file. All you need to do is to upload your document and start editing it. Do it all online. Choose which pages you want to mark and simply embed a text or an image in seconds.