Full-width & Half-width Converter
Full-width & Half-width Converter: Subtracts 0xFEE0 offset from full-width Unicode characters (U+FF01 to U+FF5E) to map to standard ASCII.
About this full-width & half-width converter
Full-width & Half-width Converter — browser-based utility.
How this tool works
Implements client-side Full-width & Half-width Converter operations. Subtracts 0xFEE0 offset from full-width Unicode characters (U+FF01 to U+FF5E) to map to standard ASCII specifically designed for a database cleaner converts full-width japanese/chinese characters into standard ascii half-width format.
- Invisible Codepoint Detection: Scans character codepoint ranges against Unicode formatting categories (Cf, Cc), highlighting hidden characters.
- Unicode Normalization: Applies selected normalization form (NFC canonical composition, NFD decomposition, NFKC/NFKD compatibility).
- Pangu Spacing Heuristics: Evaluates character-pair boundaries via regex lookaheads, injecting half-width spaces between CJK ideographs and alphanumeric ASCII.
- Whitespace Collapsing: Cleans repeated spaces, trailing line spaces, and redundant blank lines according to user settings.
Worked example
Scenario: A database cleaner converts full-width Japanese/Chinese characters into standard ASCII half-width format.
Sample input:
Processing: Subtracts 0xFEE0 offset from full-width Unicode characters (U+FF01 to U+FF5E) to map to standard ASCII.
Illustrative output:
Limits and verification
Does not alter intentional whitespace within code blocks when code-preservation mode is selected. Carefully preserves directional formatting markers (RLM/LRM) when bi-directional Arabic/Hebrew text is explicitly preserved.
Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.
Browser processing boundary
Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.
Relevant references
These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.
- The Unicode Standard Version 15.1
- Standard Browser Web API / Algorithm Implementation (No single external RFC/ISO standard)
Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology
How to use it
- Enter, paste, or select your input data into the Full-width & Half-width Converter workspace controls.
- Review available parameter fields, units, formats, or options configured for your task.
- Click the action button or observe immediate live calculations rendered in your browser runtime.
- Inspect the resulting output and any diagnostic messages, then copy or download the result if needed.
Frequently asked questions
What does Full-width and Half-width Converter transform?+
It maps full-width ASCII punctuation, digits, and letters in the U+FF01–U+FF5E block down to ASCII and maps ideographic space U+3000 to a normal space.
What did the browser fixture verify?+
ＡＢＣ １２！ became ABC 12!, demonstrating the code-point offset conversion and ideographic-space replacement.
Does it convert Japanese kana or Chinese ideographs?+
No. Those characters are outside the covered full-width ASCII range and remain unchanged; this is not a transliteration or language converter.
Can the output recover the original width choices?+
No. The operation is one-way normalization in this interface. Once full-width ASCII forms become ASCII, their former glyph-width choice is not stored.