Both ASCII and TXT files are just text files so editable using any text editor and you can rename the extension freely. However you may have been looking for a way to convert ASCII numbers to a text in which case it would be best to use websites like ASCII to text converter.
Convert ASCII text characters file to Simple text.
We have found 10 software records in our database eligible for .ascii to .txt file format conversion.
Microsoft Windows software - convert ascii to txt on Windows
A powerful text and source codes editing tool
Convert from ascii file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned ascii to txt. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A free source code and text editor for Windows
Various text format conversion utility
One of the many text viewers and editors
An alternative text editor
Apple macOS / Mac OS X software - convert ascii to txt on OS X
A text and source code editing software for Mac
A sophisticated Mac source code editor for programmers
Linux/Unix software - convert ascii to txt on Linux
A text and source code editing software for Linux
A sophisticated Linux source code editor for programmers
On-line services software - convert ascii to txt on web
An online tool for generating ASCII number from text