PrimoPDF is the web’s #1 free software for creating 100% industry-standard PDF files. Simple to use and free of annoying ads, converting files to PDF has never been easier!
Nitro PDF Professional adds one-click PDF conversion for common office documents like Microsoft Word, Excel, PowerPoint, Visio, Publisher, and offers a full suite of PDF editing capabilities.
| Features | PrimoPDF Free |
Nitro Pro Free 14-day trial |
| Creation | ||
| Create PDF files from 300+ file types. |  |
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| Make PDF documents for different uses, including online viewing, eBooks, office printing, and prepress (high-end printing). | |
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| Combine PDF files after they are converted. | |
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| Secure with passwords and add document information (title, author, etc.) during creation. | |
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| Fast one-button creation from Microsoft® Word, Excel® and PowerPoint®. | - | |
| Steamlined drag-and-drop and batch PDF creation support. | - | |
| Editing, Collaboration, Conversion | ||
| Print, form-fill, annotate and review PDFs. | - | |
| Edit PDF, including text, graphics and pages. | - | |
| Optimize, repair and shrink PDF files. | - | |
| Create and design PDF forms. | - | |
| Convert PDF to Microsoft® Word, RTF, text and images. | - | |
| Review documents electronically with sticky notes, stamps, drawings, and markup tools. | - | |
| Digitally sign, certify and secure PDF files. | - | |
| Technical & System Information | ||
| PDF files conform to the PDF 1.4 specification. | |
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| PDF files conform to the PDF 1.5 specification. | |
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| Microsoft® Windows® 2000, XP, Vista (64-bit PrimoPDF only). | 10.8 MB | 25.8 MB |
 Download PrimoPDF |
Download Nitro Pro |
Create, edit, view, secure, form-fill, annotate and sign PDF files - and do it all on-screen.
Convert to PDF from any file you can print, including Microsoft Word, Excel and PowerPoint.
