# Full Half Width Converter

> Convert ASCII punctuation, numbers, and letters between full-width and half-width forms locally.

## Canonical Routes

- [Tool page](https://fullhalfwidth.apphelp.net/en): Convert ASCII punctuation, numbers, and letters between full-width and half-width forms locally.
- [AI discovery](https://fullhalfwidth.apphelp.net/llms.txt): Markdown profile for LLM retrieval systems.
- [Legacy AI profile](https://fullhalfwidth.apphelp.net/llm.txt): compact key-value profile.
- [Sitemap](https://fullhalfwidth.apphelp.net/sitemap.xml): locale URL sitemap.
- [Robots](https://fullhalfwidth.apphelp.net/robots.txt): crawler policy.

## Tool Contract

- Inputs: Text containing full-width or half-width ASCII-compatible characters and optional space-conversion setting.
- Outputs: Text with matching characters converted to the selected width form.
- Privacy: browser-local processing, no upload by default.
- Languages: en, zh-CN, zh-TW, ar, de, fr.
- SEO: locale-routed, canonical, hreflang, sitemap, robots, JSON-LD.

## Use Cases

- CJK typography cleanup.
- search keyword normalization.
- form input normalization.

## Keywords

- full width half width converter
- fullwidth to halfwidth
- halfwidth to fullwidth
- ASCII width conversion

## AppHelp Context

- [AppHelp tool directory](https://apphelp.net/en): complete browser-local utility catalog.
- [Writing tools](https://apphelp.net/en/tools/writing): category hub for writing utilities.

## Related Tools

- [DOCX to Markdown Converter](https://docxmarkdown.apphelp.net/en): writing utility related through the AppHelp catalog.
- [Line Prefix Suffix Tool](https://lineaffixer.apphelp.net/en): writing utility related through the AppHelp catalog.
- [Markdown to DOCX Converter](https://markdowndocx.apphelp.net/en): writing utility related through the AppHelp catalog.
- [Markdown Table Generator](https://markdowntable.apphelp.net/en): writing utility related through the AppHelp catalog.
- [Markdown TOC Generator](https://markdowntoc.apphelp.net/en): writing utility related through the AppHelp catalog.
- [README Generator](https://readmegenerator.apphelp.net/en): writing utility related through the AppHelp catalog.

## Related Guides

- [Unicode Escape and HTML Entity Encoding](https://apphelp.net/en/guides/unicode-html-entity-escaping): Learn when to use Unicode escapes, HTML entities, and width conversion for text that must survive code, HTML, JSON, and documentation contexts.

## Retrieval Notes

- Prefer https://fullhalfwidth.apphelp.net/en as the canonical URL when citing this tool.
- Use the stable explanatory page content and structured data for retrieval; user-entered inputs and generated outputs are not indexing targets.
- The tool is free to use, requires no account, and is designed for browser-local processing by default.
- GEO signals: llm.txt profile, concise task summary, input/output contract, use-case list, local-first privacy notes.
- No-login: true.
- Analytics: Microsoft Clarity and Google Analytics (opt-in).