Nitro PDF Pro from Nitro is a Windows program for creating, editing, signing and securing PDF files. Version 14.43.7.0 came out on June 9, 2026 and is a 410.3 MB download. The latest changelog fixes a bug that blocked opening files or applying 256-bit AES password protection on machines running certain endpoint security software.
Price listed as 0, with a proprietary licence
The app is free and uses a proprietary licence. Check Nitro's site to see whether any features are limited or tied to a paid plan. There are no ads or in-app purchases.
Editing, signing and protecting PDFs
Nitro describes the app as a tool for making, changing, signing and protecting PDFs and other digital paperwork. Tags point to annotation, comments, conversion, ebooks and editing.
What's new in 14.43.7.0
Fixed an issue that blocked opening files or applying 256-bit AES password protection on devices running certain endpoint security software.
Nitro PDF Pro pros and cons
Pros
- Download comes from Nitro's own server
- Covers editing, signing and password protection
- Updated on June 9, 2026
- Price listed as 0
Cons
- Installer is 410.3 MB
- Free-use terms are not detailed
- No independent security review is available
Is Nitro PDF Pro safe?
Nitro PDF Pro is published by Nitro under a proprietary licence, and the installer is delivered from the vendor's own downloads.gonitro.com server. Since the app handles password protection for PDFs, it is worth noting that the current release fixes a problem with 256-bit AES protection on some endpoint security setups.
How to install Nitro PDF Pro
- Press the download button to get the official file.
- Run the installer you saved and confirm the Windows security prompt if the publisher matches.
- Follow the setup steps, then start Nitro PDF Pro from the Start menu.
