The Japanese grammar checker that actually understands context.

Fix nuance, particles, and keigo with AI that knows what you mean and suggests natural phrasing, so you write with confidence, every time.

Write Japanese with Confidence

From particles and grammar to keigo and kanji — our AI ensures your Japanese is always natural and professional.

Context-Aware AI

Our AI understands the nuances of Japanese context to provide the best suggestions.

Grammar & Keigo

Fix complex particles and honorifics with precision.

Smart Conversion

Convert Romaji to the correct Kanji based on context.

Available Everywhere

Start on mobile, finish on desktop. Your data is always synced.

AI GRAMMAR & PARTICLES

Fix Particles &
Grammar Instantly.

Stop worrying about "wa" vs "ga". Our AI detects complex grammatical errors, incorrect particles, and unnatural phrasing that basic spell checkers miss.

Particle Correction

Accurate "Teniwoha" checks for wa, ga, ni, wo, and more.

Conjugation Checks

Fix verb and adjective forms giving you trouble.

Natural Phrasing

Write like a native speaker with natural expression suggestions.

Pro

会議 始まります。

Grammar

会議始まります。

GoJapanese

彼は足が早いです。

Spelling

彼は足が早い速いです。

GoJapanese
SMART SPELL CHECK

Catch the typos that
change your meaning.

Standard spell checkers miss context. We catch the subtle Kanji errors and homophone mix-ups that turn a professional sentence into a confusing one.

Context, not just Spelling

Hayai (Fast) or Hayai (Early)? We pick the right one automatically.

Okurigana Consistency

Never worry about verb ending variations again.

Whole-Sentence Logic

We analyze the full thought, not just individual words, to ensure logical flow.

STYLE & TONE

The right level of politeness.
Every single time.

From casual chats to boardroom emails, adjust your politeness level instantly. Ensure your Keigo (honorifics) is respectful and your tone fits the room.

Keigo Guardrails

Instantly spot and fix rude phrasing or double-honorific mistakes.

The "Cushion" Effect

We suggest standard Kusshon Kotoba (cushion words) to soften requests and sound more native.

Context Matching

The AI knows who you are talking to and suggests the appropriate level of respect.

資料を確認してください

Style

資料を確認してくださいお手数ですが、ご確認いただけますでしょうか。

GoJapanese
Grammar
Original:
ドア開きました。
The door opened.
Suggestion:
ドア開きました。
Reason:
Aku (to open) is intransitive. Use particle ga. Use wo with Akeru (transitive).
GoJapanese
LEARNING

Learn the "why" behind the fix.

Every correction comes with a "Why." Turn your mistakes into mastery with clear English explanations for every suggestion.

Logic, Explained

We don't just swap the word; we tell you the grammatical rule behind it.

Grammar Deep Dives

Understand the nuance of particles, transitive verbs, and conjugations in real-time.

Active Learning

Improve your actual Japanese proficiency with every sentence you type.

AI
川の向こうへ、|hashi
1(Bridge)
2(Chopsticks)
3(Edge)
Press Space to select
GoJapanese
SMART INPUT

Focus on the flow.
We'll handle the script.

Your brain thinks in meaning. Your fingers type in Romaji. GoJapanese bridges the gap instantly.

Zero Friction

Forget copy-pasting from translation apps. Write directly in your natural flow.

Intelligent Intent

We know hashi means "chopsticks" at dinner and "bridge" on a map.

Stay in the Zone

A writing experience so smooth you'll forget you're using a tool.

Everything you need to know

Common questions about GoJapanese's AI-powered Japanese writing assistant

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Join thousands of Japanese learners and writers who trust GoJapanese for flawless writing.

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Japanese Grammar Checker | Best AI writing assistant for Japanese in 2026 | GoJapanese