ST to TXT Converter

ST to TXT Conversion Explained

Converting .ST to .TXT changes a specialized source code file into a universal plain text file. The .ST file extension is primarily used for two distinct programming languages: Structured Text (a high-level language for Programmable Logic Controllers defined by IEC 61131-3) and Smalltalk (an object-oriented programming language).

Because .ST files already contain plain text, this conversion does not alter the actual code characters. Instead, it changes how operating systems and applications interact with the file. People convert .ST to .TXT to share code with non-programmers, bypass strict email attachment filters, or open the file on devices lacking specialized development software. The main trade-off is that you gain universal accessibility but lose native integration with compilers and syntax highlighting in Integrated Development Environments (IDEs).

Typical Tasks and Users

• Automation Engineers: Sharing PLC logic routines with project managers, clients, or mechanical engineers who do not have PLC programming software installed.
• Software Developers: Archiving Smalltalk code snippets in standard text-based knowledge bases or documentation systems.
• IT and Security Teams: Reviewing automation scripts or source code without installing heavy, proprietary IDEs.
• General Users: Bypassing corporate firewalls or email clients that block .ST files due to their classification as executable scripts or unknown formats.

Software & Tool Support

Because .ST files are text-based, they can be opened by standard text editors, though specialized software is required to compile them.

• Standard Text Editors: Notepad++ (Windows) and Visual Studio Code (Cross-platform) can open both .ST and .TXT files. VS Code offers extensions to restore syntax highlighting for both Structured Text and Smalltalk.
• PLC Environments: Software like CODESYS, Beckhoff TwinCAT, and Rockwell Studio 5000 natively generate and compile .ST files.
• Smalltalk Environments: Platforms like Pharo and Squeak use .ST for source code filing.
• Command-Line Tools: Users can manually rename extensions using ren file.st file.txt in Windows Command Prompt or mv file.st file.txt in Linux/macOS terminal.

Pros and Cons of the Conversion

Pros:

• Universal Compatibility: .TXT files open natively on Windows, macOS, Linux, iOS, and Android without third-party software.
• Easier Sharing: Email clients and cloud storage platforms rarely flag .TXT files as security risks.
• Simplicity: The file becomes readable to anyone, making it ideal for documentation and archiving.

Cons:

• Loss of IDE Association: Double-clicking the .TXT file will no longer launch your PLC or Smalltalk development environment.
• Broken Compilation: Compilers require the .ST extension to recognize the file as valid source code.
• No Syntax Highlighting: Basic text editors will display the code as flat, uncolored text, making complex logic harder to read.

Conversion Difficulties & Why Convert.Guru

While converting .ST to .TXT seems like a simple extension change, real technical problems occur with character encoding and line endings. Legacy PLC systems often export .ST files using older ANSI encodings or include unexpected Byte Order Marks (BOM). Furthermore, moving an .ST file from a Linux-based PLC environment (using LF line endings) to a Windows text editor (expecting CRLF line endings) can cause the entire code block to render as a single, unreadable line.

Convert.Guru handles this conversion accurately by normalizing the file structure. When you convert .ST to .TXT through the platform, it automatically detects and standardizes character encoding to universal UTF-8. It also corrects line breaks, ensuring the code formatting, indentation, and structure remain perfectly intact regardless of the operating system you use to open the final .TXT file.

ST vs. TXT: What is the better choice?

Which format should you choose?

You should choose .ST when you are actively writing, debugging, or deploying code. If the file needs to be compiled by a PLC or executed in a Smalltalk environment, it must retain the .ST extension.

You should choose .TXT when you need to distribute the code for review, print the logic, or store snippets in a generic database. Convert .ST to .TXT if you are sending the file to a recipient who does not write code, or if your email server rejects the original file. Avoid this conversion if the file must remain linked to a live automation project.

Conclusion

Converting .ST to .TXT is a practical solution for sharing and documenting Structured Text or Smalltalk source code outside of specialized development environments. The biggest limitation to watch for is the immediate loss of compiler recognition and syntax highlighting. Convert.Guru is a reliable choice for this exact conversion because it safely normalizes text encoding and line endings, ensuring your code remains perfectly formatted and readable on any device.