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PYC Version Checker
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Identify the Python version of .pyc files via magic numbers to resolve compatibility issues.
Drag & Drop or Click to Upload PYC Files
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When migrating projects across different Python environments, .pyc file version compatibility can be a headache. This tool quickly and accurately identifies the Python version of a .pyc file (e.g., Python 3.8.5) by parsing the magic number in the file header—a 4-byte identifier that records the version of the Python interpreter used to compile it.
What should I do if the PYC version detection fails?
First, check the file's integrity. A corrupted .pyc file may be missing the magic number in its header.
Is the mapping between magic numbers and Python versions fixed? Every minor Python release (e.g., 3.8.1 to 3.8.2) changes the magic number, while major releases (e.g., 3.7 to 3.8) completely reset the encoding rules.
This tool only supports standard .pyc files (not .pyo or .pyw). The maximum file size is 10MB. The detection result does not include decompiled bytecode content.
Typical magic number examples: Python 3.9.7 → 0x610d0d0, Python 2.7.18 → 0x03f30d0a. When executing .pyc files across different versions, we recommend using this tool first to verify magic number compatibility.
