.txt · text/plain
What is a .txt file?
Plain Text File
About the format
A .txt file is text with no formatting and no hidden structure — the simplest, safest, most durable file format there is. Every OS ships an editor for it, nothing about it can execute, and a text file written forty years ago still opens today. The only technicalities that ever surface are invisible ones. Encoding: modern files are UTF-8; files from old Windows tools may be ANSI (a legacy 8-bit code page) or UTF-16, and a file whose 'special characters look wrong' is being read with the wrong encoding — Notepad's Save As dialog shows and converts encodings. Line endings: Windows ends lines with CRLF, Unix with LF; Notepad has handled both since 2018, but a file that displays as one endless line in an ancient tool has Unix endings. And the extension-hiding caveat applies in reverse: 'file.txt.exe' with extensions hidden displays as 'file.txt' — one of the oldest tricks in the malware book, and a reason to keep 'File name extensions' visible in Explorer.
How to open a .txt file
Windows
- Notepad
- any editor ever written
macOS
- TextEdit, any editor
Linux
- any editor
Is a .txt file dangerous?
No — genuinely inert. The only trick is a disguised double extension pretending to be .txt.
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