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 already know Chinese characters from one of the three languages have a real head start when reading the others.
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.