Use APKPure App
Get Base64 ⇄ QmFzZTY0 old version APK for Android
Encode/decode Base64 on the fly
A simple application for encoding/decoding string to/from Base64. Encoding and decoding is done while you're typing; No hitting buttons involved.
No distractions, no ads, and no special permission requirements.
This app is open source. Its source code can be found here; https://github.com/RobinJ1995/Base64-QmFzZTY0