Open the app, click 'Open File,' select your eBook from your device, and choose your preferred reading mode for a comfortable reading experience.

It supports EPUB, MOBI, AZW, AZW3, PDF, DJVU, FB2, CBZ, CBR, XPS, CHM, and TXT files for reading and conversion.

Go to 'Settings' > 'Themes' to select themes like Light, Sepia, Dark, and adjust layout modes in the reading interface.

Yes, use the batch conversion feature by selecting multiple files and choosing your target format at the bottom of the conversion panel.

Click on 'Convert' in the main menu, then select multiple files, choose your preferred output format, and start the batch process.

Most features are free, but theme customization, printing, and unlimited conversions require an upgrade via 'Settings' > 'Upgrade'.

The free version allows up to 3 eBook conversions; unlimited conversions require a paid upgrade.

Go to 'Settings' > 'Upgrade,' then select your preferred plan and follow the prompts to complete the purchase.

Ensure your file format is supported and up-to-date. If issues persist, try re-opening the file or converting it to a compatible format.

Check for updates via 'Settings' > 'Check for Updates,' or download the latest version from the official website.