In 2021, the most reliable "online" or software-free method remains the rename-and-extract technique:
In 2021, many users preferred using dedicated installers to bypass the conversion step entirely: XAPK Installer
On the fourth day, a converted PDF disclosed the name of a courier—Leena—who met Arjun three months prior at a market stall. The file contained a time, a place, and a phrase: "Tell them the lighthouse sings." Mira found Leena in a bookshop smelling of coffee grounds and secondhand dictionaries. The woman blinked when she saw the notebook.
This method works 99% of the time because XAPK is literally a renamed ZIP archive.