To save WhatsApp chat as evidence for Android users: Step 1. Firstly, open the required individual conversation, click three dots, and select More. Choose the email icon and compose an email to export a TXT file. Step 2. Now, open your email, download the TXT file, and open it in the WPS Office app. Go for the Tools section and press Export to PDF. Step 3. After previewing, hit Export to PDF again, choose a destination folder, and save your PDF for legal purposes.