Use Terrasavr for item editing. For actual map editing, use a PC with TEdit and transfer the world file — it’s the only reliable free method.
Using a map editor always carries a risk. Unlike paid software, free editors might not handle the new tile formats of Terraria 1.4.4+ perfectly. Here is how to avoid disaster: terraria map editor mobile free
: This is a cross-platform web application that works on mobile browsers. It allows you to view and edit .wld files directly in your browser without downloading software. TManager : A popular free "hub" app for Android users. Use Terrasavr for item editing