There are many different open source licenses but they all must comply with the Open Source Definition - in brief: the software can be freely used, modified and shared. Programs released under this license can be used at no cost for both personal and commercial purposes. Open Source software is software with source code that anyone can inspect, modify or enhance. Freeware products can be used free of charge for both personal and professional (commercial use). Xodo also makes its tools available in a browser, so there’s no need to download it at all.Freeware programs can be downloaded used free of charge and without any time limitations. Again, it’s completely free and is full-featured.

Xodo PDF Reader and Annotator is also an excellent option. Unlike Nitro PDF Reader, these are free programs. Two of the most popular are Foxit Reader and Adobe Reader DC. Are there any good free alternatives to Nitro PDF Reader?

Regarding the data within your PDFs, Nitro Pro offers password-protected encryption. It’s safest to download programs directly from the developer's websites to avoid PUPs.

Nitro’s target customers are businesses, so the company knows its software needs to be safe to download. Pricing for Nitro Pro starts with a one-time payment of $157 for a single user. If you want to retain access to those features after 14 days, you’ll need to buy the relevant program. You can download a free trial version that gives you full access to the complete Nitro Productivity Suite, including Nitro Pro and Nitro Sign. You’re also able to see if a PDF document is digitally signed and if it contains bookmarks and comments. You can create PDFs from other document types, highlight text, and add sticky notes. Despite its name, Nitro PDF Reader does substantially more than just allow you to read PDF files – even in the free version.

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