The simplest answer: whatever text editor came with your operating system
A .txt file is plain text — just letters, numbers, and basic punctuation with no formatting. Your computer already has a program that opens it. On Windows, that's Notepad. On Mac, it's TextEdit. On Linux, it's usually gedit or nano. Double-click any .txt file and one of these opens automatically.
You don't need to read anything or change settings. The file opens in whatever your system chose as the default text editor. If you want to use a different program instead, you can change that default, but the file itself works the same way in any text editor.
Key Takeaways
- Windows comes with Notepad, Mac comes with TextEdit, and Linux comes with gedit or nano — all open .txt files without any extra software.
- Double-clicking a .txt file automatically opens it in your system's default text editor.
- You can open the same .txt file in multiple different programs, and the content stays identical.
- Specialized text editors like Visual Studio Code or Sublime Text are optional upgrades for people who write code or work with text files constantly.
Built-in programs that come with your operating system
Notepad is the Windows default. It opens when ready, shows plain text only, and has almost no features — no fonts, no colors, no formatting buttons. That simplicity is the point. If you open a .txt file on any Windows computer, Notepad is what appears unless someone changed the default.
TextEdit is the Mac equivalent. It also opens .txt files by default, though it can also save in other formats. For .txt files specifically, it behaves the same way Notepad does: plain text, no frills.
gedit and nano are the Linux defaults depending on which version you use. Both are text editors built into the operating system. They work identically to Notepad and TextEdit — they open .txt files without any setup.
Other programs that can open .txt files
Because .txt files are just plain text, almost any program that handles words can open them. Microsoft Word opens .txt files. Google Docs opens them. LibreOffice Writer opens them. Your web browser can open them. Even some programs designed for other purposes — like code editors or note-taking apps — will open a .txt file if you ask them to.
The difference is that these programs add their own features on top. Word might suggest formatting changes. Google Docs might offer cloud storage. A code editor might add line numbers or syntax highlighting. But the .txt file itself doesn't change — it's still just plain text underneath.
Why you might choose a different program
If you write code, you probably want a code editor instead of Notepad. Programs like Visual Studio Code, Sublime Text, or Atom show line numbers, highlight different parts of code in different colors, and help you spot mistakes. They're free or cheap, and they make working with code faster.
If you take lots of notes, you might prefer a note-taking app like OneNote or Obsidian. These let you organize notes into folders, search across all your files, and sync across devices. They still save as .txt or similar formats, but they add structure that plain Notepad doesn't have.
For most people, though, the default program is fine. You're not losing anything by using Notepad or TextEdit. A .txt file is a .txt file no matter which program opens it.
How to change which program opens .txt files
On Windows, right-click any .txt file and select "Open with." A menu shows all the programs on your computer that can open text files. Pick the one you want, then check the box that says "Always use this app to open .txt files." From then on, that program opens when you double-click.
On Mac, right-click (or Control-click) the file, select "Open With," choose your program, then click "Change All." This changes the default for all .txt files at once.
On Linux, the process varies by desktop environment, but right-clicking and selecting "Open With" or "Properties" usually gives you the option to set a default.
What happens if you open a .txt file in the wrong program
Nothing bad. A .txt file is just text. If you accidentally open it in Word or a web browser, it still reads the same way. You might see extra formatting options you don't need, but the actual content is unchanged. You can close it and open it in a different program without any damage.
The only real risk is if you edit the file in a program that adds formatting — like Word — and then save it. Word might add invisible formatting codes that change the file type or make it behave differently in other programs. To avoid this, save it as plain text (.txt) rather than Word's native format (.docx).
Frequently Asked Questions
Can I open a .txt file in multiple programs at the same time?
Yes. You can open the same .txt file in Notepad and Word and your browser all at once. They all show the same content. If you edit it in one program and save, the others will show the updated version the next time you open the file.
What's the difference between a .txt file and other file types?
.txt files contain only plain text — no images, no formatting, no special features. A .docx file (Word) can contain all of those. A .pdf file is locked and usually can't be edited. A .txt file is the simplest, most universal format, which is why it opens in almost everything.
Do I need to install anything to open a .txt file?
No. Your operating system comes with a text editor already built in. You can open any .txt file when ready without downloading or installing anything.
Why would someone send me a .txt file instead of a Word document?
.txt files are smaller, open faster, and work on any device — old computers, phones, tablets, anything. They're also safer because they can't contain viruses or hidden code the way Word documents can. People often use .txt for sharing straightforward information that doesn't need formatting.