What is this Japanese (gojuon) sort tool?
A free, browser-based tool that sorts a pasted list in Japanese 五十音順 (gojuon / あいうえお order). It uses the browser's built-in Japanese collation (Intl.Collator), so hiragana and katakana are ordered by reading. You can switch between ascending and descending order and remove duplicate lines. Everything runs locally in your browser, so your list is never uploaded.
How to use it
- Paste your list into the box on the left, one item per line.
- Choose the order — ascending (あ→ん) or descending (ん→あ).
- Optionally turn on "Remove duplicates" to collapse identical lines.
- Copy the result or download it as a text file.
Common use cases
- Putting a name list (members, attendees, customers) in あいうえお order.
- Ordering categories, tags, or product names for a tidy table or dropdown.
- Deduping and sorting a rough list pasted from a spreadsheet or document.
A note on kanji and readings
Reading-aware sorting is best-effort. Where the browser knows a kanji's reading it sorts by that reading; otherwise kanji fall back to code-point order, because no reading dictionary is embedded. For precise gojuon order on kanji-heavy lists, add the reading (furigana) next to each item and sort that column.