A (local) app to copy and share messages from a WhatsApp chat.
This is a Progressive Web App (PWA) that process the WhatsApp chat export data within your browser. The data not sent to the external server — you could verify this by trying the app in offline mode.
The code for this app is on GitHub.
NOTE: Currently, the app is only supported on Android + Chrome. Firefox doesn't support installation of PWAs. Safari supports installation of PWAs, but iOS doesn't let other apps share content with installed PWAs.