Troubleshooting Character Encoding Problems
Garbled text, question marks, and missing characters are symptoms of encoding mismatches. This guide helps you diagnose and fix the most common character encoding problems in web pages, files, and databases.
Key Takeaways
- Encoding issues have distinctive visual signatures that help you identify the specific problem.
- If a web page shows garbled text, check these in order:
- The golden rule: declare UTF-8 explicitly at every layer of your stack — file encoding, HTTP headers, HTML meta tags, database charset, and application code string handling.
- File encoding: The actual file must be saved as UTF-8.
Word Counter
Count words, characters, sentences, and paragraphs.
Recognizing Encoding Problems
Encoding issues have distinctive visual signatures that help you identify the specific problem.
Common Symptoms
Mojibake Patterns
| You See | Likely Cause |
|---|---|
é instead of e |
UTF-8 decoded as Latin-1 |
??? or boxes |
Font missing the character |
� (replacement char) |
Invalid byte sequence |
| Double-encoded chars | Data encoded twice |
HTML Pages
If a web page shows garbled text, check these in order:
- HTTP header:
Content-Type: text/html; charset=utf-8 - Meta tag:
- File encoding: The actual file must be saved as UTF-8.
All three must agree. If any one differs, the browser may misinterpret the text.
CSV Files
Excel assumes CSV files use the system's default encoding (often Windows-1252 on Windows). To ensure Excel opens your CSV correctly:
- Add a UTF-8 BOM (
EF BB BF) at the start of the file. - Or use the Text Import Wizard and explicitly select UTF-8.
Database Issues
Ensure your database connection, table, and columns all use the same encoding. In MySQL, check character_set_client, character_set_connection, and character_set_results. In PostgreSQL, check client_encoding.
Prevention
The golden rule: declare UTF-8 explicitly at every layer of your stack — file encoding, HTTP headers, HTML meta tags, database charset, and application code string handling.
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