Tadashii Kotoba
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Output

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Quality tiers

Each conversion draws from a premium (high) or standard quality pool on your plan. They are counted separately.

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Premium quality uses Google Gemini — best for proofreading, keigo, nuance, furigana, and Google voice reading.

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Standard quality uses DeepSeek — fast and suited to everyday rewriting when premium quota is tight.

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Auto mode tries premium first and falls back to standard only when premium quota is unavailable.

Open for live counters and reset dates. Compare Free vs Pro under .

Common questions
What is the difference between premium and standard quality?

Premium quality focuses on accuracy, style nuance, and Japanese-specific tasks like proofreading and keigo. Standard quality is optimized for speed and larger volume. Both rewrite your text — the tier only changes which AI processes it.

How are characters counted?

We count the input text length of each request. Example: a 500-character rewrite deducts 500 from the selected quality pool; converting the same text to another style deducts another 500. Furigana deducts the length of the text being annotated. Premium (Google) voice deducts the spoken text from the premium-quality pool. Browser system voice does not consume characters.

What happens when I reach a limit?

Premium-quality requests may switch to standard automatically in Auto mode, or pause until your quota resets. Sign in for higher limits, or upgrade to Pro for monthly pools.

Do I need an account?

Guest use works without signing in, with lower daily limits tracked in this browser. Signed-in users get quota on their account across devices.

Is my text stored or used to train AI models?

Your text is sent to the provider needed for each request and is not used to train models. See Privacy & Security below for retention details.

Writing styles

Fix grammar, wording, and punctuation while keeping your meaning (separate workspace tab)

Standard

Polite, grammatically correct Japanese for everyday writing

Business

Formal Japanese using keigo (敬語) throughout — for work emails and official messages

Casual

Natural, friendly casual Japanese for everyday use

Literary

Refined, literary Japanese for elegant prose

How it works
1
Enter your text

Input Japanese text to rewrite, or non-Japanese text to convert into Japanese first.

2
Choose a mode

Use Restyle for Standard, Business, Casual, or Literary — or the Proofread tab for corrections.

3
Review & use

Review the result and optionally use Furigana or Diff to inspect changes.

4
Listen to Japanese

Use voice reading on either the input or output to check pronunciation, rhythm, and how the sentence sounds aloud.

Privacy & security
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Submitted text is processed by a third-party AI provider (depending on the quality tier) and is not stored permanently on our servers

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Authenticated users have their conversion history saved for their own reference

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Guest IP addresses are used only for rate limiting and are not linked to personal data

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Data is shared only with the providers needed to run the service (AI processing, payments, email delivery, and hosting)

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Login is via Google OAuth or magic link — we never store your Google password