This Japanese JLPT level checker estimates how hard a passage is to read by scanning its kanji against representative N5-through-N1 lists and reporting the highest level any character reaches. Because kanji are the main gatekeeper of Japanese reading difficulty, this gives learners a fast sense of whether a text matches their level, and lets teachers and content creators grade material before sharing it.
How it works
The JLPT has five levels, from N5 (easiest) to N1 (hardest), and each level is associated with a
band of kanji a learner is expected to know. The tool stores a representative set of core kanji per band
and assigns every kanji the lowest level at which it normally appears. It then walks your text, looks
up each kanji (any character in the CJK range U+4E00–U+9FFF), and tracks the hardest level seen —
where “harder” means a lower JLPT number, with anything outside the lists ranked beyond N1.
The reported result is that hardest level, because a reader must recognise the single most advanced kanji to read the whole passage comfortably. Kana — hiragana and katakana — and punctuation are ignored, so a text with no kanji simply reports as N5 or below. Alongside the headline level, a table breaks the kanji down by band (how many are N5, N4, and so on) and the tool lists a handful of the hardest kanji that drove the estimate, so you can see exactly which characters to study.
Example and tips
Paste a sentence like 私は毎日日本語を勉強します and you will see almost everything land in the N5–N4
range, giving a beginner-friendly estimate. Add a newspaper headline or a term such as 環境 or 議論 and
the estimate jumps to N2 or N1, because those kanji belong to the higher bands. The “hardest kanji” line
tells you precisely which characters pushed the level up.
Treat the result as a reading-difficulty signal, not an official score: the real JLPT also tests grammar, vocabulary, and listening. For graded reading practice, look for texts that top out around your current level, and mine the hardest-kanji list for your next flashcards. Everything runs locally, so private notes never leave your device.