Click the "Select File" button above, and choose your OWL file.
You’ll see a preview, if available.
Click the "Convert file to..." button to extract text information.
Convert OWL to another file type
To convert OWL ontologies to another format, you need Protégé or other Data software.
Convert a file to OWL
To convert other file formats to the "Web Ontology Language" file type, you need software like Protégé or a similar tool.
About OWL files
The .OWL format is primarily a Web Ontology Language file used to represent complex knowledge graphs and semantic relationships on the internet. These files are typically created and managed using specialized ontology editors like Protégé. Working with .OWL files can be frustrating. Because they are designed to store intricate, logical connections between concepts rather than simple text or tables, the underlying structure is highly complex. Most .OWL files are based on the XML or RDF specification. This makes them incredibly verbose, resulting in large files that are extremely difficult for humans to read directly. You cannot simply open an ontology in a standard word processor or spreadsheet tool. Attempting to force this hierarchical graph data into a flat format causes massive data loss. Standard online converters fail completely because they lack the logic engine required to parse the semantic web structure. If you need to share or modify the data more easily, the best conversion targets are TTL (Turtle) or .JSON-LD. These formats preserve the linked data properties but offer a cleaner, more modern syntax. Converting to standard XML or RDF is also possible for legacy system support. Be aware that converting an ontology to CSV or plain TXT will strip away the reasoning logic and relational mapping. Because .OWL is a highly specialized standard, it often requires the original logic engine to fully interpret the embedded rules.
Convert.Guru analyzes your OWL file, detects the exact format, and lets you read the text inside.
If you want to convert OWL file to TTL, RDF, JSON, CSV, JS, TS, PY, JAVA, CPP, C, CS or PHP, you can use Protégé or similar software from the "Semantic Web Ontology Storage" 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 OWL, try Protégé or another comparable tool in the "Semantic Web Ontology Storage" category.
The OWL 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 OWL converter.