What does "residual strokes" mean?

The total strokes of a kanji minus the strokes of its radical. For instance 漢 (13 strokes) has the radical 氵 (a 3-stroke variant of 水, radical 85), so its residual is 10. Unihan classifies every CJK ideograph as (radical, residual), and this tool exposes that classification directly.

Why don't variant components (氵 / 忄 / 艹) appear as separate radicals?

Unicode treats variants as their own characters, but Unihan's kRSUnicode classifies kanji under the parent radical (氵 → 水/85, 忄 → 心/61, 艹 → 艸/140). The selection UI only lists parents, but variants are shown next to the selected radical so you can recognise either form inside a kanji.

What character range is covered?

Unicode 17.0 CJK Unified Ideographs (U+4E00–U+9FFF), CJK Extension A (U+3400–U+4DBF), and CJK Compatibility Ideographs (U+F900–U+FAFF) — about 28,050 characters in total. Extensions B and beyond (U+20000+) are excluded to keep the bundle small.

How are simplified / traditional / new-form / old-form variants handled?

They are distinct Unicode characters and listed separately. Under radical 213 (龜/亀) you will see traditional 龜, simplified 龟, and Japanese shinjitai 亀 all in the same residual-strokes bucket. Pair this tool with kanji-stroke-count and kyujitai-shinjitai for richer lookups.

Which Unicode field is used?

`kRSUnicode` from Unihan_IRGSources.txt (Kangxi Radical-Stroke). Apostrophe variant markers (e.g. `120'.3`) are stripped to the parent radical, and when multiple values are given the first (radical, residual) pair is used.

Back to Japanese

Kanji Radical Lookup

Reverse-lookup kanji by Kangxi radical (1–214) and residual stroke count, just like the radical index in a paper kanji dictionary. Pick a radical (一 / 人 / 木 / 氵 / 言 …) and a remaining-strokes filter to list every matching CJK ideograph from Unicode 17.0 (28,000+ characters). Click to copy; component variants (心→忄, 水→氵, 艸→艹) are noted under each radical. Runs entirely in your browser.

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How to use

Pick one of the 214 Kangxi radicals from the top panel (grouped by radical stroke count, 1–17). Matching kanji appear below, grouped by residual strokes (the strokes not in the radical). Use the residual filter to narrow further. Click any kanji to copy it. The flow mirrors the radical index in a paper kanji dictionary, useful when you can read neither the on- nor kun-yomi. Data is Unicode 17.0 Unihan kRSUnicode bundled with the page (28,000+ characters), runs entirely in your browser.

FAQ

What does "residual strokes" mean?: The total strokes of a kanji minus the strokes of its radical. For instance 漢 (13 strokes) has the radical 氵 (a 3-stroke variant of 水, radical 85), so its residual is 10. Unihan classifies every CJK ideograph as (radical, residual), and this tool exposes that classification directly.
Why don't variant components (氵 / 忄 / 艹) appear as separate radicals?: Unicode treats variants as their own characters, but Unihan's kRSUnicode classifies kanji under the parent radical (氵 → 水/85, 忄 → 心/61, 艹 → 艸/140). The selection UI only lists parents, but variants are shown next to the selected radical so you can recognise either form inside a kanji.
What character range is covered?: Unicode 17.0 CJK Unified Ideographs (U+4E00–U+9FFF), CJK Extension A (U+3400–U+4DBF), and CJK Compatibility Ideographs (U+F900–U+FAFF) — about 28,050 characters in total. Extensions B and beyond (U+20000+) are excluded to keep the bundle small.
How are simplified / traditional / new-form / old-form variants handled?: They are distinct Unicode characters and listed separately. Under radical 213 (龜/亀) you will see traditional 龜, simplified 龟, and Japanese shinjitai 亀 all in the same residual-strokes bucket. Pair this tool with kanji-stroke-count and kyujitai-shinjitai for richer lookups.
Which Unicode field is used?: `kRSUnicode` from Unihan_IRGSources.txt (Kangxi Radical-Stroke). Apostrophe variant markers (e.g. `120'.3`) are stripped to the parent radical, and when multiple values are given the first (radical, residual) pair is used.

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