UTF checker

Validate UTF-8 encoding in text and files with detailed analysis and error detection

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Total Calculations Run

< 15ms

Browser Execution Speed

100%

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4.9 / 5.0

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About This Tool

The UTF Checker is a comprehensive online tool that validates UTF-8 encoding in both text input and uploaded files. It performs thorough analysis to detect encoding issues, validate byte sequences, check for proper Unicode compliance, and identify potential problems like invalid byte sequences, overlong encodings, and surrogate pairs. The tool provides detailed reports with character-by-character analysis, making it essential for developers, content creators, and anyone working with international text.

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How to Use

Enter text directly in the text area OR upload a file using the drag-and-drop zone
Choose validation options (strict mode, check BOM, etc.)
Click 'Validate UTF-8' to analyze the text
View detailed results including encoding status, character count, issues found, and character-by-character analysis
Download the validation report if needed

Frequently Asked Questions

Find Quick Answers

What is UTF-8 encoding?

UTF-8 is a variable-width character encoding capable of encoding all valid Unicode code points using one to four bytes. It's the dominant encoding for the web and many applications.

What types of UTF-8 issues can this tool detect?

The tool detects invalid byte sequences, overlong encodings, surrogate code points in UTF-8, non-characters, control characters, and missing or unexpected byte order marks (BOM).

Can I check files larger than text input?

Yes, the file upload option allows checking larger files, though very large files may take longer to process. The tool handles common text file formats.

What is strict validation mode?

Strict mode performs additional checks beyond basic UTF-8 validation, including rejecting overlong encodings and certain control characters that may cause security issues.

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