If you’re learning Japanese, you may have noticed that some characters look identical to Chinese or Korean. That’s because Kanji (漢字), Hanzi (汉字), and Hanja (한자) all share the same origin — Classical Chinese characters.
What They Have in Common
- All three originate from Chinese characters created thousands of years ago
- The literal name in all three languages means “Han characters” (漢字)
- Many characters share the same or very similar meaning
- Many characters look identical or nearly identical
Key Differences
| Kanji (Japanese) | Hanzi (Chinese) | Hanja (Korean) | |
|---|---|---|---|
| Character forms | Traditional (mostly) | Simplified & Traditional | Traditional |
| Readings | On'yomi + Kun'yomi | Single reading (+ tones) | Single Sino-Korean reading |
| Daily use | ~2,136 (Jōyō kanji) | ~3,500 common | Mostly replaced by Hangul |
| Essential? | Yes (mixed with kana) | Yes (the main script) | Optional (rarely written) |
| Character count | ~50,000+ (2,136 standard) | ~80,000+ (3,500 common) | ~5,000+ (rarely used) |
Readings: The Biggest Difference
This is what makes Japanese kanji uniquely challenging. Each character has multiple readings:
On’yomi (音読み): The Sino-Japanese reading, borrowed from Chinese pronunciation centuries ago. Used in compound words (熟語).
Kun’yomi (訓読み): The native Japanese reading. Used when the character stands alone or with okurigana (hiragana endings).
For example, the character 水 (water):
- Japanese: ON: すい (sui), KUN: みず (mizu)
- Chinese: shuǐ (one reading)
- Korean: 수 (su) when used (rare in modern Korean)
Simplification: A Diverging Path
In the 1950s-60s, Mainland China simplified many characters to increase literacy. Japan undertook its own (separate) simplification, called Shinjitai. The results often differ:
- Traditional: 學 (Study)
- Japanese Shinjitai: 学
- Chinese Simplified: 学 (same result here, but often they differ)
- Korean: Still uses 學 when Hanja is written
Does Knowing One Help with the Others?
Absolutely. If you learn Japanese kanji, you’ll recognize many Chinese characters on signs, menus, and texts — even without speaking Chinese. The meanings often overlap even when the pronunciations are totally different.
Learners who know Chinese characters from any of the three languages report picking up the others 2-3x faster for reading comprehension.
Why Kanji Is Worth Learning
Unlike Hanja (which is fading from Korean usage), Kanji is essential for Japanese literacy. You cannot read a newspaper, novel, or even a restaurant menu without it. The good news: you only need ~2,136 characters (the Jōyō kanji set) for full fluency.
Kanjijo covers all Jōyō kanji with SRS, mnemonics, and more.