Users of the online tool 'PDF to EPUB' by PDF24 may encounter difficulties when trying to convert large PDF files into the EPUB format. The problem may be manifested by longer loading times, failed conversions, or freezing of the user interface. This could be due to the file size, the complexity of the PDF file, or technical limitations of the tool. This issue may result in users not achieving the desired results and being frustrated, especially if they rely on the tool to convert important documents for their work or their studies. Therefore, it's necessary to find a solution to the problem of converting large PDF files into the EPUB format, in order to ensure that the tool operates efficiently and reliably.

To solve the problem of converting large PDF files into the EPUB format, the 'PDF to EPUB' tool by PDF24 has implemented advanced uploading and conversion technology. This allows even extensive and complex PDF files to be effectively processed. In addition, the tool has built in a progressive loading algorithm that optimizes the user experience by reducing longer loading times. In case of failed conversions, the tool offers the possibility to restart the process, with automatic adjustments being made to improve the conversion. In exceptional cases, where the user interface freezes, the tool can be reloaded without affecting the conversion process. This ensures that users can rely on a reliable solution, no matter how large or complex their PDF files are. With 'PDF to EPUB' by PDF24, any user can successfully convert their PDF files into the EPUB format, regardless of size and complexity.