How can I split every line in a text file into 2?

So:

FirstlineFirstline
Here's another piece of data

Becomes:

Firstline
Firstline
Here's another
 piece of data

Is there an easy way? I have no coding skill.

Edit: More details:

I have a long text file of data. Each line contains an even number of characters. I want to insert a line break precisely half way through each line to break it into 2.

I’m working on a project which requires long lists of data to be formatted neatly. I’m not a coder and don’t have access to any particular coding software, but so far I’ve been able to achieve everything I needed with a combination of online utilities and the “find and replace” function in my text editor (Notepad2), sometimes using backslash expressions or Regex syntax.

I did a lot of searching for an online utility for this particular objective (splitting lines in half) but had no luck at all.

I also haven’t been able to find any way of doing it with regex that will work in Notepad2. I did look into the possibility of doing it with a batch and VBScript but they seem too complicated for me and I feel there would be too much of a learning curve for what I’m trying to achieve.

I was hoping there might be a simple and obvious way I’d overlooked that doesn’t require installing software. Maybe there’s an extremely simple solution that requires no coding at all? A simple command I can paste into a command prompt? It doesn’t seem like a complicated thing to want to do, only unusual.

I appreciate that this isn’t a script-writing service, and I’m not asking anyone to write code for me, just perhaps a suggestion of what might be the easiest solution, things I could try in Windows given I’m not a coder. If the .bat route is my best bet then perhaps someone could give some pointers?