Free online PUML to TXT converter

Source format: PUML

PUML is a text-based file format used to store PlantUML source code. It is commonly used by software developers, architects, and technical writers to describe diagrams such as UML class diagrams, sequence diagrams, activity diagrams, use case diagrams, and more. A PUML file is usually plain text, which makes it easy to edit in any code editor and to keep under version control.

Typical use cases include documenting software systems, generating diagrams from source, and maintaining diagram definitions alongside code in development projects.

Target format: TXT

TXT is a plain text format that stores unformatted text only. It is one of the most compatible file types available and can be opened by virtually any text editor or operating system. The main advantages of TXT are its simplicity, broad compatibility, and small file size.

TXT is commonly used for notes, logs, configuration snippets, source text, and other content where formatting is not required.

How to perform the conversion

Converting PUML to TXT is usually straightforward because both formats are text-based. In most cases, the conversion simply means saving or renaming the PlantUML source as a plain text file with a .txt extension.

1. Open the .puml file in a text editor such as Notepad++, Visual Studio Code, Sublime Text, or any plain text editor.
2. Select File → Save As.
3. Choose .txt as the file extension, for example diagram.txt.
4. Make sure the editor saves the file as plain text and not as rich text or formatted document content.
5. If needed, verify that the encoding remains compatible, such as UTF-8.

If you only need the raw PlantUML source preserved as text, you can also simply copy the contents of the .puml file into a new .txt file. You can convert the file on 101convert.com for free, without installing any software.

Notes on quality and limitations

This conversion does not change the content itself; it only changes the file extension and storage format to plain text. Because PUML is already text, there is usually no loss of information when converting to TXT.

However, a TXT file cannot preserve any special editor features, syntax highlighting, or diagram rendering. If the file is later opened in a PlantUML-aware tool, it will still contain the same source code, but it will no longer be identified specifically as a PlantUML file unless renamed back to .puml.

For best compatibility, keep the text encoding consistent and avoid introducing formatting characters from word processors. If your goal is to edit or archive the source, TXT is a safe and simple choice.