Yes, PDF Reader - PDF Editor offers a free version with limited features, as well as a free trial period for users to experience the full range of premium functionalities before committing to a subscription.

PDF Reader - PDF Editor can be used offline for basic functionalities such as reading and editing PDFs. However, some features like cloud storage access and online sharing may require an internet connection.

Users can contact support or send feedback through the app's built-in support feature or by visiting the official website. Support options typically include email, live chat, or a support ticket system for assistance.

You can manage or cancel your subscription through the app store where you initially subscribed, whether it's the Apple App Store or Google Play Store. Instructions for managing subscriptions are typically found in the account settings section of the app.