Text Coder is a simple app for hide whatever you type on it.
Just type or paste a text, and push on the code button to convert the text in an unreadable bunch of characters. Push the copy button to copy the coded text. You can backup the coded text in the app/chat/document or the way you prefer.
For read the coded text, push on the sandwich menu on the top left corner, paste the text and push on the decode button.
The Text Coder app doesn't keep or save any text you entered once you close it.