Text Formatter Tool
What You Can Do
The Text Formatter Tool automatically formats text by converting line breaks, whitespace, and full-width/half-width characters. Perfect for formatting copy-pasted text and data cleaning. All processing happens in your browser, so no data is sent to servers.
- ✅ Line Break Conversion: Convert between CRLF and LF for cross-OS compatibility
- ✅ Whitespace & Blank Line Processing: Remove consecutive spaces, trim whitespace, and delete blank lines
- ✅ Full-width ⇄ Half-width Conversion: Convert alphanumeric characters and katakana, sort lines, and remove duplicates
Batch process line break conversion, whitespace removal, and full-width/half-width conversion.
📝 Text Input
✨ Formatted Result
⚙️ Formatting Options
💼 Use Cases
- Format copy-pasted text - Clean up text extracted from web pages or documents
- Standardize full-width/half-width - Normalize character types for data preprocessing
- Prepare lists - Add symbols at the beginning of lines for list creation
- Batch convert upper/lowercase - Standardize English text notation
- Remove duplicate lines - Perfect for data cleaning and organization
How to Use
📌 Basic Usage
Enter text and click the formatting option button you want to apply. The formatted text will be displayed in the result area.
💡 Line Break Conversion
- CRLF → LF: Convert Windows format (\r\n) to Unix/Mac format (\n)
- LF → CRLF: Convert Unix/Mac format (\n) to Windows format (\r\n)
⚙️ Whitespace Processing
- Remove All Spaces: Delete all half-width and full-width spaces
- Trim Whitespace: Remove whitespace from the beginning and end of each line
- Normalize Spaces to One: Collapse consecutive whitespace to one space
- Remove Blank Lines: Delete all empty lines
🔤 Full-width ⇄ Half-width & Use Cases
Supports half-to-full, full-to-half, and katakana conversions. Perfect for cross-OS file conversion, data cleansing, CSV file formatting, and programming text preparation.
📚 Text Formatting Technology & Mechanisms
Full-width/Half-width Character Code Mechanism
Full-width/half-width character conversion uses the relative position of Unicode character code values. There is a fixed offset value (0xFEE0) between half-width alphanumeric characters (ASCII: 0x0021-0x007E) and full-width alphanumeric characters (Unicode: 0xFF01-0xFF5E).
- Half → Full Formula: Full-width code = Half-width code + 0xFEE0
- Full → Half Formula: Half-width code = Full-width code - 0xFEE0
- Katakana Conversion Complexity: Half-width katakana has independent dakuten/handakuten characters, requiring a mapping table to correspond to single full-width katakana characters
Line Break Standards & Compatibility
Different operating systems use different line break representations. This can cause issues during file migration or system integration, making proper conversion important.
- CRLF (Carriage Return + Line Feed): Windows (\r\n). Clearly marks line endings, offering high compatibility with legacy systems
- LF (Line Feed): Unix/Linux/macOS (\n). Simple and efficient, the standard for modern systems
- CR (Carriage Return): Classic Mac OS (\r). Rarely used today
Regular Expression Patterns & Applications
Regular expressions are powerful tools for text formatting. Here are the main patterns used in this tool.
- /\r\n/g: Detects all CRLF. Global flag (g) targets all matches
- /[\s ]+/g: Detects consecutive half-width spaces, full-width spaces, tabs, and line breaks
- /[!-~]/g: Detects half-width alphanumeric and symbols (ASCII 0x21-0x7E range)
- /[！-～]/g: Detects full-width alphanumeric and symbols (Unicode full-width range)
Practical Use Cases for Text Formatting
This tool is useful in many scenarios. Here are specific examples to understand its value.
- Data Import Preprocessing: Before importing to databases or spreadsheets, standardize character codes, spaces, and line breaks to ensure data quality
- Cross-platform Compatibility: When using text files created on Windows on Mac/Linux, convert line breaks to LF
- Web API Response Processing: Normalize text retrieved from external APIs that contains unexpected character codes or spaces
- User Input Cleaning: Remove leading/trailing whitespace and duplicate lines from text submitted via HTML forms
- Log File Analysis: Remove duplicate lines from multi-line logs and extract only necessary data
- Natural Language Processing Preprocessing: Normalize text to a unified format before morphological analysis or text mining
What is the Text Formatter?
The Text Formatter is a free online tool that performs bulk text processing such as case conversion, whitespace removal, and line sorting.
Who is this for?
Anyone cleaning up extra spaces and line breaks from copied text, people batch-converting text case, those removing duplicate lines or sorting text, and engineers doing quick data preprocessing.
Key Features
- Multiple formatting options: case conversion, whitespace removal, line sorting, and more
- Remove duplicate lines and blank lines
- Completely free with no registration required
- All processing is done in your browser - no data is sent to any server
FAQ
CRLF (\r\n) is the line break format for Windows, while LF (\n) is used by Unix/Mac/Linux. When transferring text files between different operating systems, line break differences can cause issues. This conversion feature helps unify them.
Yes, it supports bidirectional conversion between full-width katakana and half-width katakana. Katakana with dakuten and handakuten marks are also converted correctly.
No, the text in the input area remains unchanged. Formatted results are displayed in a separate output area, so you can try different formatting operations while keeping the original text intact.
No, all processing is done in your browser. Your input data is never sent to a server.
It's completely free with no usage limits. No user registration is required.
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