Full-Width Half-Width Converter for Kana, Letters, Spaces
Convert full-width letters and numbers to half-width, and half-width katakana to full-width. Normalize spaces and symbols, then copy the result.
Conversion Options
Symbol Normalization
How to use
Paste Your Text
Paste the text into the input box (the output updates automatically as you type).
Choose Rules
Pick only what you need: width conversion, space cleanup, and symbol normalization.
Copy the Result
Click "Convert" if needed, then use "Copy" to paste into your destination.
Normalize mixed full-width letters and numbers
Convert full-width alphabet and number variants such as ABC or 123 into consistent half-width text, while restoring half-width Katakana to easier-to-read full-width Katakana.
Clean repeated spaces and pasted text noise
Trim leading and trailing whitespace, collapse repeated spaces, and prepare copied text for spreadsheets, databases, search fields, and form validation.
Control space, hyphen, and wave-dash variants
Standardize full-width and half-width spaces for downstream systems, and optionally unify troublesome hyphen and wave-dash variants before import or review.
Frequently asked questions
Is my text sent to a server?
No. Conversion runs in your browser, and your text is not sent anywhere.
What’s the difference between full-width and half-width?
Full-width characters are wider (e.g., ＡＢＣ) and common in Japanese text, while half-width are narrower (ABC). Many systems prefer half-width for consistent input and search.
What exactly gets converted?
It focuses on full-width alphanumerics → half-width, half-width Katakana → full-width, and full-width spaces → half-width. Optional space cleanup and symbol normalization are available; Kanji/Hiragana are left as-is.
Why normalize hyphens or wave dashes?
Lookalike symbols can be different characters, which breaks searching and comparisons. Normalizing them helps avoid subtle mismatches.
Can I use this before pasting into Excel?
Yes. Normalizing width and spaces before CSV/Excel input helps with search, sorting, and deduplication.
Why convert half-width Katakana to full-width?
Half-width Katakana can render inconsistently depending on fonts and systems. Converting to full-width improves consistency and searchability.