Click the "Select File" button above, and choose your CLS file.
You’ll see a preview, if available.
Click the "Convert file to..." button to extract text information.
Convert CLS to another file type
To convert CLS Classes to another format, you need Microsoft Office or other Developer software.
Convert a file to CLS
To convert other file formats to the "Source Code Module" file type, you need software like Microsoft Office or a similar tool.
About CLS files
The .CLS file format primarily stores source code that defines an object-oriented class. Its most common uses include VBA (Visual Basic for Applications) class modules in Microsoft Office, Apex programming classes in Salesforce, and document class definitions in the LaTeX typesetting system. Occasionally, software like InterSystems Caché generates .CLS files that are actually disguised PDF documents. Because .CLS files are deeply tied to their specific development environments, they are difficult to share with non-technical users. For example, a VBA .CLS file cannot run independently; it must be imported into a host application like Microsoft Excel. Furthermore, VBA macros pose a significant security risk, meaning email clients and firewalls often block raw .CLS attachments. Apex classes require a Salesforce developer environment to execute, and LaTeX classes require a TeX compiler. To overcome these limitations, you need to convert the file to a more accessible format. For code reviews, archiving, or sharing with non-developers, convert .CLS to PDF. For publishing code snippets to the web, convert to HTML or Markdown (.MD). If you simply want to make the text universally readable without triggering email security filters, convert to standard TXT.
Convert.Guru analyzes your CLS file, detects the exact format, and lets you read the text inside.
If you want to convert CLS file to XLS, JS, TS, PY, JAVA, CPP, C, CS, PHP, RB, GO or RS, you can use Microsoft Office or similar software from the "Source Code Class Definitions" category. In the File menu, look for Save As… or Export….
To convert SH, PY, KT, PS1, SWIFT, LUA, PL, JAVA, SCALA, JS, VBS or TS files to CLS, try Microsoft Office or another comparable tool in the "Source Code Class Definitions" category.
The CLS Converter Story
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our CLS converter.