Convert TXT to CFG

A game, router, application, or embedded device may reject a settings file unless its name ends in .cfg. Renaming a valid plain-text configuration file is usually enough; ordinary notes still require rewriting to match the target software's syntax.

What the TXT format is

.txt identifies plain text, not a particular data structure. Notepad, TextEdit, Linux editors, code editors, scripts, and export tools create TXT files containing notes, logs, tables, or configuration directives. The extension does not indicate the character encoding, line-ending convention, or syntax of the contents.

What the CFG format is

.cfg is a filename convention for configuration data, not a universal format. A program may require key-value pairs such as fullscreen=true, INI-style sections such as [network], colon-separated settings, JSON-like objects, or a vendor-specific command language.

CFG files let software load settings from a known location while remaining editable in a plain-text editor. The target program's documentation defines valid parameter names, separators, section headers, comments, quoting, Boolean values, encoding, and line endings. A renamed file is usable only when its contents already follow those rules.

How to create a CFG file

1. Back up the source. Copy the original TXT file before changing its name or contents.
2. Inspect the syntax. Open the file in Notepad++ on Windows, Visual Studio Code on Windows, macOS, or Linux, or another plain-text editor. Do not use Microsoft Word or another rich-text editor, which can insert formatting and incompatible characters.
3. Compare it with the target application's example. Correct parameter names, separators, section headers, paths, comments, capitalization, quoting, and value types. For example, fullscreen: yes is not equivalent to fullscreen=true unless the application documents that syntax.
4. Save a plain-text copy. Use File → Save As, enter a name such as settings.cfg, and select UTF-8 only if the receiving software supports it. In Notepad++, use Encoding → Convert to UTF-8 when the source encoding is unsuitable, then save the copy.
5. Verify the extension. In Windows File Explorer, enable View → Show → File name extensions. Confirm that the file is settings.cfg, not settings.cfg.txt.
6. Install and test it. Put the file in the directory specified by the program or device documentation. Start the software, check its error log, and restore the backup if it reports an invalid line or resets the settings.

If the contents are already valid for the target program, renaming is sufficient. On Linux or macOS, run:

mv settings.txt settings.cfg

In Windows Command Prompt, run:

ren settings.txt settings.cfg

For multiple files in PowerShell, use:

Get-ChildItem *.txt | Rename-Item -NewName { $_.BaseName + '.cfg' }

These commands change filenames only; they do not translate TXT content into a different configuration language.

Online and desktop tools

Notepad++, Visual Studio Code, and other local plain-text editors are the safest choices because they preserve the file as text and allow encoding and line-ending checks. General online services such as CloudConvert or Convertio may be considered for a non-sensitive file only if their current format list explicitly supports the requested text conversion, but they cannot infer a program's proprietary CFG syntax. Do not upload files containing passwords, API keys, device credentials, private addresses, or other confidential settings.

Quality and compatibility checks

There is no universal TXT-to-CFG conversion because CFG has no single specification. Renaming a document, log, or unrelated text file does not create valid configuration data, and converting it to JSON, YAML, XML, or INI is correct only when the target application supports that language.

Preserve required comments, indentation, capitalization, quotation marks, and blank lines. Check the editor's line-ending setting when the software is old or platform-sensitive: LF is standard on Linux and macOS, while many Windows programs use CRLF. Visual Studio Code exposes this setting through View → Command Palette → Change End of Line Sequence. Encoding mismatches can produce garbled characters or cause a device to reject the file, so follow the target application's documented encoding rather than assuming UTF-8.