Japanese用の無料Grammar Checker

JapaneseテキストでGrammar Checkerを使う手順

Open Grammar Checker. Open Grammar Checker on TextWordCount in any browser—phone, tablet, or desktop. Nothing to install.
Paste or type your Japanese text. Drop in Japanese (日本語) or type fresh. The editor handles full Unicode Japanese, including accents, combining marks, and complex scripts.
Fix issues and re-run. Apply suggested grammar, spelling, and punctuation fixes for Japanese, then re-check the updated passage.
Copy results and keep working locally. Copy numbers or edited text back into your doc. Everything runs in your browser; your Japanese text is not uploaded to our servers.

Japaneseテキストの実践的なコツ

Japanese (Japanese) uses no spaces between words — Grammar Checker estimates word boundaries using morphological analysis. For exact platform limits, use the character count.
Working across Japanese and English? Paste one language at a time in Grammar Checker — mixed-language drafts produce counts that reflect both vocabularies combined.
Grammar Checker analyses your Japanese text as-is. Finish all edits before running the final check — late additions change every count and reading time estimate.
If you write in Japanese regularly, bookmark this page — the workflow on mobile and desktop is identical and nothing requires an account.

Grammar Checker tool interface for Japanese language — screenshot

Japanese用にGrammar Checkerを使用

今すぐJapanese（日本語）テキスト用の無料grammar checkerツールの使用を開始してください。 Japanese話者、作家、翻訳者、コンテンツ作成者に最適です。

Grammar Checkerを無料で開く

Japaneseについて

現地名称: 日本語

地域: Asia

話者: 125M+ worldwide

文字: Japanese

言語コード: ja

説明: Japanese, spoken by over 125 million people, primarily in Japan

Grammar Checker features and results for Japanese — screenshot

By the numbers

Numbers worth knowing for Japanese writing

Citation-grade reference points for Japanese (日本語) content.

125M+
Native and second-language Japanese speakers worldwide
Source: Ethnologue / Wikipedia language pages
Japanese
Writing system used for Japanese (日本語)
Source: Unicode — Wikipedia

How Grammar Checker handles common scripts

Japanese-script content sits among other writing systems. The table below compares how Grammar Checker measures each — useful when you mix languages in a draft.

Grammar Checker script behaviour comparison for Japanese.
Script	Word boundary	Primary metric	Direction
Latin (English, Spanish, French, …)	Spaces + punctuation	Words and characters	Left-to-right
Cyrillic (Russian, Ukrainian, …)	Spaces + punctuation	Words and characters	Left-to-right
Arabic (Arabic, Urdu, Persian, …)	Spaces + punctuation	Words and characters	Right-to-left
CJK (Chinese, Japanese, Korean)	No spaces — character-level	Characters (preferred)	Left-to-right
Thai	Few spaces — boundary detection	Characters (preferred)	Left-to-right
Devanagari (Hindi, Marathi, …)	Spaces + Indic clusters	Words and characters	Left-to-right

Grammar Checkerの機能

Highlight

Grammar error detection

Spelling correction

Punctuation fixes

Writing style suggestions

Using Grammar Checker for Japanese writing — screenshot

Japanese用にGrammar Checkerを使用する理由

Japanese言語サポート

当社のgrammar checkerは、Japanese文字を含むJapanese（日本語）テキストを完全にサポートします。

無料でアクセス可能

当社のgrammar checkerは、すべてのJapanese話者に完全無料です。登録や支払いは不要です。

プライバシー第一

すべての処理はブラウザでローカルに実行されます。Japaneseテキストはデバイスから離れることはなく、完全なプライバシーを保証します。

始める準備はできましたか？

今すぐJapanese（日本語）テキスト用の無料grammar checkerツールをご利用ください。登録不要、即座に動作します。

Grammar Checkerを無料で試す

よくある質問 — Japanese向けGrammar Checker

Grammar CheckerはJapaneseのテキストをどのように扱いますか？

Japanese（日本語）はラテン語のように単語間にスペースを置かないことがあります。grammar checkerは文字数とスペース区切りの「語」を数えますが、Japaneseでは文字数のほうが実用的です。Unicode の Japanese 文字は正しく処理されます。

Grammar CheckerはJapaneseコンテンツ向けに無料ですか？

はい。grammar checkerはJapanese（日本語）テキスト向けに無料で、語数・文字数の上限はありません。登録や課金は不要です。処理はブラウザ内で行われ、テキストはプライベートのままです。

文法チェックはJapaneseに対応していますか？

文法チェックはJapanese（日本語）の一般的な構造上の問題を処理し、Japanese文字をサポートします。本番向けの文章はネイティブの校正と併用してください。

誰がJapanese向けにGrammar Checkerを使っていますか？

世界に 125 百万人以上のJapanese話者がいる（主にアジア）なかで、grammar checkerは論文、記事、SNS、学術提出物などで長さを把握したい学生・著者・ブロガー・クリエイター・専門家に使われています。

Japaneseテキストは安全ですか？

はい。grammar checkerはJapanese（日本語）テキストをブラウザ内の JavaScript のみで処理し、サーバーに送信しません。

Japaneseテキストに語数・文字数の上限はありますか？

いいえ。必要なだけJapanese（日本語）テキストを貼り付けられます。性能はブラウザに依存しますが、多くの環境で数十万Japanese文字まで問題なく扱えます。

モバイルでJapaneseテキストにGrammar Checkerは使えますか？

はい。画面はレスポンシブでタッチ操作に適しています。メモ、メール、メッセージアプリからJapanese（日本語）を貼り付け、grammar checkerを実行して結果をコピーできます。アプリのインストールは不要です。

Does Grammar Checker count Japanese (日本語) accurately?

Yes. Grammar Checker uses Unicode segmentation, so Japanese text is measured against the same standard the operating system uses. For Japanese content the character count is the more reliable metric, since words are not space-separated.

What's the difference between word and character counts for Japanese?

In Japanese the character count is the canonical metric — platforms like Twitter Japan limit by characters (140), not words. Grammar Checker shows both, but treat the character figure as your platform-of-record number.

Can Grammar Checker handle mixed Japanese and English drafts?

Yes — grammar checker counts the combined text without distinguishing language. For accurate per-language stats, paste each language separately. Mixed drafts return a total that reflects both vocabularies together, which is fine for length checks but misleading for keyword density.

Does Grammar Checker work for Asia dialects of Japanese?

Yes. Grammar Checker treats text uniformly across dialects in the Asia region. Spelling and word choice differ between dialects, but the count and analysis logic does not — you'll get consistent numbers regardless of regional variant.

Glossary

Vocabulary you'll see counting Japanese

The vocabulary behind Grammar Checker, from word counts to readability.

Word countSource ↗: The total number of word tokens in a piece of text, typically derived by splitting on whitespace and punctuation. Common in publishing, education, and SEO as a length metric.
Character countSource ↗: The total number of code points (or graphemes, in Unicode-aware tools) in a text. Platforms like SMS and Twitter enforce limits in characters, not words.
UnicodeSource ↗: The international standard that assigns a unique number to every character in every script. Modern text tools use Unicode so counts work consistently across languages and emoji.
Grammar checkerSource ↗: Software that flags spelling, punctuation, and grammar issues by comparing input text against rule-based or statistical models of a language.
Intl.SegmenterSource ↗: A JavaScript API that splits text into Unicode graphemes, words, and sentences using the same locale rules browsers use natively. Tools that use it count complex scripts correctly.

How we count, and when this page was checked

Word and character counts on this page use the browser's Unicode-aware Intl.Segmenter API, so figures match the underlying graphemes rather than guessing from byte length. Reading-time estimates default to 238 wpm (Brysbaert, 2019). Last editorial review: 2026-05-18.

Japanese用のその他のツール

Text Summarizer for Japanese

Create concise summaries of long texts automatically

Plagiarism Checker for Japanese

Detect duplicate content and check text originality

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