Fullwidth to Halfwidth Converter

Convert fullwidth characters to halfwidth characters for proper text formatting

Keep original line breaks and paragraph structure

Display detailed statistics about the conversion process

Key Facts

Category
Text & Writing
Input Types
textarea, select, checkbox
Output Type
text
Sample Coverage
4
API Ready
Yes

Overview

The Fullwidth to Halfwidth Converter is a precise utility designed to normalize text by transforming wide-format characters into their standard ASCII halfwidth equivalents, ensuring consistent typography and compatibility across digital platforms.

When to Use

  • •Standardizing text copied from CJK-based environments for use in English-centric software.
  • •Fixing inconsistent spacing or character widths in code, database entries, or configuration files.
  • •Cleaning up user-generated content that contains accidental fullwidth punctuation or alphanumeric characters.

How It Works

  • •Paste your text containing fullwidth characters into the input area.
  • •Select your preferred conversion mode, such as converting all characters or targeting specific types like numbers or punctuation.
  • •Adjust settings to preserve line breaks or generate a comparison report.
  • •Click the convert button to instantly receive your normalized, halfwidth text.

Use Cases

Normalizing database inputs to ensure consistent character encoding and searchability.
Formatting code comments or documentation that accidentally included fullwidth symbols.
Cleaning up messy text copied from legacy systems or international document formats.

Examples

1. Standardizing Data Entry

Data Analyst
Background
A dataset imported from a legacy system contains fullwidth numbers (１２３) that prevent mathematical calculations.
Problem
The system does not recognize fullwidth digits as valid numeric values.
How to Use
Paste the data into the input field, select 'Numbers Only' mode, and convert.
Example Config
conversionMode: numbers, preserveLineBreaks: true
Outcome
The numbers are converted to standard ASCII digits, allowing the spreadsheet software to perform calculations correctly.

2. Cleaning Web Content

Content Editor
Background
A blog post draft contains fullwidth punctuation (！？，。) that looks inconsistent with the rest of the site's typography.
Problem
Inconsistent character widths disrupt the visual flow of the text.
How to Use
Paste the text, select 'Punctuation and Symbols Only', and generate the output.
Example Config
conversionMode: punctuation, outputFormat: converted
Outcome
All punctuation marks are normalized to standard halfwidth versions while keeping the original text content intact.

Try with Samples

text
Hex/Unicode Encoding Format Samples
Examples of hex (\xXX) and unicode (\uXXXX) escape sequence encoding formats
matched family text
text
Text Case Format Samples
Examples of different text case formats: camelCase, snake_case, kebab-case, PascalCase, and more
matched family text
text
Chinese-English Mixed Text Samples
Sample text files with mixed Chinese and English content for testing automatic spacing tools
matched family text
text
Text with Chinese Samples
Mixed language text containing Chinese characters for testing Chinese extraction
matched family text
text

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FAQ

What is the difference between fullwidth and halfwidth characters?

Fullwidth characters occupy two standard character spaces (often used in CJK scripts), while halfwidth characters occupy a single standard ASCII space.

Can I convert only numbers or punctuation?

Yes, the 'Conversion Mode' setting allows you to target specific character sets like numbers, letters, or symbols exclusively.

Will this tool affect my line breaks?

By default, the tool preserves your original line breaks and paragraph structure, though this can be toggled in the settings.

Is this tool safe for sensitive data?

Yes, the conversion happens locally in your browser, ensuring your text is not sent to any external server.

What output formats are available?

You can choose between plain converted text, a side-by-side comparison, or a detailed report including conversion statistics.

API Documentation

Request Endpoint

POST /en/api/tools/fullwidth-to-halfwidth

Request Parameters

Parameter Name Type Required Description
textInput textarea Yes -
conversionMode select Yes -
preserveLineBreaks checkbox No Keep original line breaks and paragraph structure
showStatistics checkbox No Display detailed statistics about the conversion process
outputFormat select Yes -

Response Format

{
  "result": "Processed text content",
  "error": "Error message (optional)",
  "message": "Notification message (optional)",
  "metadata": {
    "key": "value"
  }
}
Text: Text

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-fullwidth-to-halfwidth": {
      "name": "fullwidth-to-halfwidth",
      "description": "Convert fullwidth characters to halfwidth characters for proper text formatting",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=fullwidth-to-halfwidth",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

If you encounter any issues, please contact us at [email protected]