Text Processing

Fullwidth to Halfwidth Converter

Convert fullwidth characters to halfwidth characters for proper text formatting

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Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/fullwidth-to-halfwidth' \
  -H 'Content-Type: application/json' \
  -d '{"textInput":"Enter or paste your text with fullwidth characters here...\n\nExamples:\nＨｅｌｌｏ　Ｗｏｒｌｄ！\n１２３４５６７８９０\nＡＢＣＤＥＦＧ\n！？，。；：\n（　）［　］｛　｝","conversionMode":"all","preserveLineBreaks":true,"showStatistics":true,"outputFormat":"converted"}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/fullwidth-to-halfwidth

Parameters

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

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

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

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "fullwidth-to-halfwidth",
    "arguments": {
  "textInput": "Enter or paste your text with fullwidth characters here...\n\nExamples:\nＨｅｌｌｏ　Ｗｏｒｌｄ！\n１２３４５６７８９０\nＡＢＣＤＥＦＧ\n！？，。；：\n（　）［　］｛　｝",
  "conversionMode": "all",
  "preserveLineBreaks": true,
  "showStatistics": true,
  "outputFormat": "converted"
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

Questions or issues? Contact [email protected]

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