The community has rallied, and the best free solution currently is a port/app known as or using a web-based viewer combined with file manipulation. But the safest, most functional free editor for Android is BuildABeater's TEdit version for Android (usually found via GitHub or the Google Play Store as "Terraria World Editor").
If you are looking for a map editor just to get specific items, it is often easier to download a pre-made . terraria map editor mobile free
(Web-based, works on mobile browser)
has been a sandbox phenomenon for over a decade. Unlike Minecraft, Terraria emphasizes exploration, combat, and progression. But after you’ve defeated the Moon Lord for the tenth time, or lost your hardcore character to a stray boulder, you might want a different kind of power: the power to edit your world. The community has rallied, and the best free
If you strictly want to keep everything on your phone without jailbreaking, but you are willing to use a browser, here is the best hidden gem: (Web-based, works on mobile browser) has been a