Full-width & Half-width Text Converter
HOTCross-convert full-width Zenkaku alphanumeric characters and half-width Hankaku Katakana with exact Unicode mapping.
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(CLS Prevention Active · Zero Shift)Full-width & Half-width Converter: Zenkaku to Hankaku Alphanumeric & Katakana
Text scraped from Japanese websites, legacy CJK databases, or financial institution mainframes frequently contains wide full-width characters (Zenkaku, e.g. `ＡＢＣ １２３`) instead of standard ASCII half-width characters (`ABC 123`).
These full-width characters cause database query failures, broken regex matching, programming syntax errors, and unexpected string length miscalculations.
OrvoKit Full-width & Half-width Converter provides exact mathematical Unicode mapping across the Halfwidth and Fullwidth Forms block (U+FF00–U+FFEF). It reliably cross-converts Latin alphanumeric characters, punctuation marks, ideographic full-width spaces (U+3000), and Japanese Katakana.
Unicode 0xFEE0 Mathematical Offset & Voiced Kana Normalization
How standard ASCII values correlate to full-width Unicode code points via fixed mathematical offsets alongside phonetic mark joining.
Standard printable ASCII characters maintain an exact offset of 65,248 (0xFEE0) from their full-width counterparts. The ideographic full-width space (U+3000) is remapped to ASCII 0x0020, while half-width voiced Katakana glyphs (dakuten) merge into unified precomposed characters.
👉 Wide characters are normalized into lightweight, search-friendly ASCII.
Unicode Fullwidth and Halfwidth Character Ranges
Standard code point blocks and conversion characteristics across character classes
| Character Category | Half-width (Hankaku) | Full-width (Zenkaku) | Offset / Mapping Logic | Example Pair |
|---|---|---|---|---|
| Uppercase Latin (A-Z) | U+0041 ~ U+005A | U+FF21 ~ U+FF3A | +/- 0xFEE0 linear offset | A <-> Ａ, Z <-> Ｚ |
| Lowercase Latin (a-z) | U+0061 ~ U+007A | U+FF41 ~ U+FF5A | +/- 0xFEE0 linear offset | a <-> ａ, z <-> ｚ |
| Digits (0-9) | U+0030 ~ U+0039 | U+FF10 ~ U+FF19 | +/- 0xFEE0 linear offset | 0 <-> ０, 9 <-> ９ |
| Punctuation / Symbols | U+0021 ~ U+007E | U+FF01 ~ U+FF5E | +/- 0xFEE0 linear offset | ! <-> ！, # <-> ＃ |
| Whitespace | U+0020 (ASCII Space) | U+3000 (Ideographic Space) | Special mapping rule | [ ] <-> [ ] |
| Japanese Katakana | U+FF61 ~ U+FF9F | U+30A1 ~ U+30F6 | Precomposed table mapping | ｱ <-> ア, ｶﾞ <-> ガ |
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(CLS Prevention Active · Zero Shift)How to Use
11. Paste Raw Text
Paste text containing mixed full-width characters or half-width Katakana into the editor or click [Load Sample].
22. Select Conversion Direction
Choose 'Full-width to Half-width (Zenkaku -> Hankaku)' or 'Half-width to Full-width (Hankaku -> Zenkaku)'.
33. Configure Category Filters
Toggle checkboxes for Alphanumeric, Punctuation/Symbols, Spaces, or Japanese Katakana.
44. Copy Cleaned Output
Inspect the normalized text and click [Copy Cleaned Text] for use in your database, code, or document.
Practical Applications & Industry Scenarios
Key operational workflows across technical, business, and production environments
Converting scraped full-width titles like `Ｓｏｎｙ ＷＨ－１０００ＸＭ５` into standardized `Sony WH-1000XM5` for search index deduplication.
Replacing accidental `U+3000` full-width spaces with standard spaces to resolve unexpected compiler errors.
Converting standard Latin characters into full-width Zenkaku format required by legacy administrative web forms.
Transforming fragmented half-width Katakana (`ﾄｳｷｮｳ`) into standard unified full-width Katakana (`トウキョウ`).
💡 Expert Operational Tips & Common Pitfalls
Always check for full-width spaces (`U+3000`) when dealing with mysterious syntax errors in Python or JavaScript files copied from Asian blogs.
The Katakana converter automatically merges trailing dakuten marks (`ｶ` + `ﾞ`) into single unified characters (`ガ`).
You can selectively convert only digits while leaving symbols untouched by adjusting the category checkboxes.
⚠️ Common Pitfalls & Mistakes to Avoid
Frequently Asked Questions (FAQ)
Expert answers to the most frequently asked questions and edge cases.
Zenkaku (Full-width) characters occupy a square 2-byte wide display cell typical of East Asian characters, whereas Hankaku (Half-width) characters occupy standard 1-byte ASCII widths.
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