Proofreading Checker

Categorize and highlight NG expressions in Japanese text: double-keigo, redundant phrases, ra-nuki words, and punctuation issues.

How to Use

  1. STEP 1
    Paste the text you want to proofread into the input area.
  2. STEP 2
    Issues are automatically highlighted and listed by category.
  3. STEP 3
    Add custom NG words to create your own checklist.
  • This tool uses rule-based regex detection. Context-dependent correct expressions may occasionally be flagged as errors.
  • Custom NG words are used only in-browser and are never saved to a server.

Tips

1

Run a final check before sending important emails or official documents.

2

Register your team's prohibited word list as custom NG words for consistent proofreading.

3

Ra-nuki words are common in spoken Japanese but should be avoided in business writing.

FAQ

  • Q1

    What is double-keigo?

    Double-keigo is the excessive stacking of polite forms, e.g. 'おっしゃられる'. It should be simplified to correct keigo.

  • Q2

    Can all NG expressions be detected?

    Built-in rules cover representative cases, but not all. Human review is still needed for final approval.

  • Q3

    Are custom NG words saved?

    Custom NG words reset when the page is closed. Save your list externally if you want to reuse it.

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