Halfwidth to Fullwidth Converter

Convert halfwidth characters to fullwidth characters for CJK 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 Halfwidth to Fullwidth Converter allows you to instantly transform standard ASCII characters into their fullwidth counterparts, ensuring consistent typography and alignment when working with CJK (Chinese, Japanese, and Korean) text layouts.

When to Use

  • •Aligning English text or numbers with CJK characters in documents or design software.
  • •Standardizing character widths for specific programming or legacy system requirements.
  • •Improving the visual consistency of mixed-language content in UI design or typesetting.

How It Works

  • •Paste your text into the input area.
  • •Select your preferred conversion mode, such as converting only numbers or punctuation.
  • •Choose your desired output format, such as a side-by-side comparison or converted text only.
  • •Click convert to generate the fullwidth output instantly.

Use Cases

Formatting mixed-language technical documentation for better visual alignment.
Preparing text for legacy systems that require fullwidth character encoding.
Creating uniform aesthetic layouts for social media or graphic design projects.

Examples

1. Standardizing UI Labels

UI Designer
Background
A designer is creating a bilingual interface where English labels appear misaligned next to Japanese text.
Problem
The halfwidth English characters look too narrow compared to the fullwidth Japanese characters.
How to Use
Paste the English labels into the input, select 'Convert All Characters', and choose 'Converted Text Only'.
Example Config
conversionMode: all, outputFormat: converted
Outcome
The English text is converted to fullwidth, creating a uniform visual width that aligns perfectly with the Japanese text.

2. Formatting Numeric Data

Data Analyst
Background
An analyst needs to include numeric IDs in a report that uses fullwidth punctuation and symbols.
Problem
The standard ASCII numbers look inconsistent with the surrounding fullwidth symbols.
How to Use
Input the numeric IDs, select 'Numbers Only' in the conversion mode, and generate the output.
Example Config
conversionMode: numbers, outputFormat: converted
Outcome
The numbers are converted to fullwidth format, matching the typography of the rest of the report.

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 halfwidth and fullwidth?

Halfwidth characters occupy one standard character cell, while fullwidth characters occupy two, matching the width of CJK ideographs.

Can I convert only numbers or punctuation?

Yes, use the 'Conversion Mode' dropdown to select specific character types like numbers or punctuation instead of converting the entire text.

Will this tool preserve my paragraph structure?

Yes, the 'Preserve Line Breaks' option is enabled by default to ensure your original formatting remains intact.

Is this tool suitable for large blocks of text?

Yes, the tool is designed to handle large inputs efficiently while maintaining character integrity.

What does the 'Side-by-Side Comparison' output show?

It displays the original halfwidth text next to the converted fullwidth text, making it easy to verify the changes.

API Documentation

Request Endpoint

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

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-halfwidth-to-fullwidth": {
      "name": "halfwidth-to-fullwidth",
      "description": "Convert halfwidth characters to fullwidth characters for CJK text formatting",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=halfwidth-to-fullwidth",
      "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]