The most advanced tool to detect, analyze and remove invisible Unicode characters and non-printable characters from your text. Multiple cleaning levels and professional export options.
A complete suite of tools for Unicode text analysis and cleaning
Identifies over 100 different types of invisible Unicode characters across 6 categories: Control, Spaces, Formatting, Combining, Variation, and Private Use.
4 cleaning levels: Basic, Intermediate, Advanced, and Custom. Complete control over which characters to remove.
Export detailed reports in multiple formats: JSON, CSV, TXT, and XML. Perfect for documentation and analysis.
Intuitive visual interface with color highlighting for each type of invisible character. Unicode codes and detailed descriptions.
Real-time analysis as you type. Responsive interface that works perfectly on desktop and mobile.
All processing is done locally in your browser. Your data is never sent to external servers.
Three simple steps to detect and clean invisible characters
Paste or type the text you suspect contains invisible characters into the app's text area.
Instantly see all detected invisible characters with Unicode codes and detailed descriptions.
Choose the desired cleaning level, remove invisible characters, and export the result or report.
Find problematic characters in code strings
Remove invisible formatting from imported data
Prepare texts for publishing or processing
Investigate the actual composition of suspicious strings
Use the tool directly in your browser - free and no registration required
Complete guide to use UnicodeClean efficiently
1. Paste text: Insert the text in the input area
2. Automatic analysis: Invisible characters are detected instantly
3. Choose level: Select between Basic, Intermediate, Advanced, or Custom
4. Clean text: Click "Clean invisibles" to remove characters
5. Export results: Download reports in JSON, CSV, TXT, or XML
ASCII control characters (0-31) and DEL (127)
Special non-visible Unicode spaces
Formatting markers and text direction
Diacritical characters that combine
Basic: Removes only essential control characters (NULL, BACKSPACE, etc.)
Intermediate: Removes controls + special spaces + common formatting
Advanced: Removes almost all invisible characters, including combinations
Custom: Allows you to choose specific categories for removal
Answers to the most common questions about UnicodeClean
They are characters that are part of the Unicode standard but are not visually represented on screen. They include control characters, special spaces, formatting markers, and other elements that can affect text appearance or behavior without being visible.
Invisible characters can cause various problems:
Basic: For simple texts where you want to preserve basic formatting
Intermediate: Recommended for most cases - removes common problems
Advanced: For complete cleaning, ideal for programming and structured data
Custom: When you know exactly which types of characters to remove
No! UnicodeClean works 100% locally in your browser. All processing is done on your computer and no data is sent to external servers. This ensures complete privacy and security of your texts.
UnicodeClean offers export in 4 formats:
Yes! UnicodeClean was developed with responsive design and works perfectly on smartphones and tablets. The interface automatically adapts to your device's screen size.
There's no hard limit, but very large texts (>100MB) may be processed more slowly depending on your device's capabilities. For very large files, we recommend dividing the text into smaller parts.
Invisible characters usually come from: