UnicodeDecodeError: codec can't decode byte
This error matches known, documented patterns with reliable solutions.
Quick Fix (Most Common Solution)
- Use correct encoding
- Read as binary mode
Seeing "UnicodeDecodeError: codec can't decode byte"? This error can be frustrating, but it's usually fixable. It typically affects your development workflow or system. Below you'll find clear, step-by-step solutions to resolve this issue.
What This Error Means
The bytes are not valid for the specified encoding.
Frequently documented in developer and vendor support forums.
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Common Causes
- Wrong encoding specified
- Binary file read as text
- Corrupted data
How to Fix
- Use correct encoding
- Read as binary mode
- Use errors=ignore or replace
Last reviewed: March 2026 How we review solutions
Optional follow-up
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Frequently Asked Questions
How do I find the encoding?
Use chardet library to detect.
What is the default encoding?
Python 3 uses UTF-8 by default.
Related Resources
Also Known As
- Python exception
- Python traceback
- Python runtime error
- Python crash
Common Search Variations
- "python error fix"
- "python script not working"
- "python traceback what does it mean"
- "how to fix python exception"
- "python crash on startup"
- "python import error solution"
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