📝 Text Proofreading Checker

Automatic proofreading of Japanese text. Detects "ra-zu-words," "i-zu-words," "double negatives," "redundant expressions," etc., and displays problem areas with color-coded highlighting. Suggested corrections are also provided.

Usage and Tips

  • Enter text in the text area and click "Proofreading Check
  • Problem areas are indicated by color-coded highlighting
  • Move your mouse over each issue to see potential fixes
  • False positives may occur due to regular expression-based detection

What is Text Proofreader?

Text Proofreader checks Japanese text for grammar errors, stylistic issues, and common writing mistakes directly in your browser. It detects omitted particles, redundant expressions, double negatives, spacing inconsistencies, and formatting problems. Ideal for writers, students, and professionals ensuring quality Japanese writing without relying on external services or subscriptions.

How to Use

Paste your Japanese text into the input area. The tool scans immediately, highlighting problems with color coding for different error types. Hover over or click highlighted sections to see detailed explanations of what's wrong and suggestions for correction. Common issues include missing particles (は、を、に), redundant phrases repeated unnecessarily, awkward double negatives, and spacing inconsistencies between words. Review each flagged section and decide whether to accept the suggestion or keep your original text intentionally. The tool provides explanations but leaves editing decisions to you, respecting stylistic choices and voice.

Use Cases

• Japanese students checking homework and essays before submission to teachers or professors
• Professional writers ensuring formal documents follow Japanese grammar standards and conventions
• Translators reviewing their Japanese output for naturalness, correctness, and fluency assessment
• Content creators maintaining consistent quality across blog posts, articles, and social media posts
• Non-native speakers building confidence in their Japanese writing ability through feedback and practice

Tips & Insights

Not every highlight requires change—some suggestions are stylistic rather than grammatical errors. Japanese writing has acceptable variations, so use the tool as guidance rather than absolute rules or mandates. It excels at catching common errors native speakers sometimes overlook in rushed writing, like particle omissions and redundancy. Understanding the "why" behind each suggestion helps improve your writing instincts significantly over time. For creative writing, some flagged items might be intentional stylistic choices worth keeping for voice and character.

Frequently Asked Questions

What kind of checks are available?

Detects "ra-negative" words (e.g., "見る→見られる"), "い-ngative" words (e.g., "shiteiru → shiteiru"), double negatives, redundant expressions (e.g., "~ can be done"), and notational quirks.

What is the checking accuracy?

Since detection is performed by regular expression-based pattern matching, false positives may occur depending on the context. Final judgment should be made by a human.

Will the text I type be sent to the server?

No, all processing takes place in your browser. The text you enter will not be transmitted outside the company.

Does the tool work only for Japanese or does it support other languages?

The tool is specifically designed for Japanese text proofreading and uses Japanese grammar and style rules. It will not effectively check other languages like English or Chinese.

How long does the proofreading process take?

Proofreading typically completes within seconds for standard text lengths (under 5,000 characters). Longer texts may take a bit longer but still process quickly without leaving the browser.

Can I export the proofreading results as a report?

You can copy the marked-up text with color-coded errors, but the tool doesn't generate formal reports. You can screenshot or copy the results into a document for sharing with others.

What's the maximum text length the tool can check at once?

Most modern browsers can handle several tens of thousands of characters. If you're checking very large documents, consider breaking them into sections for better performance.

Does the tool check for spelling mistakes or only grammar issues?

The tool focuses on grammar, style, and common expression errors rather than spelling. It detects issues like missing particles, redundant phrasing, and inconsistent tone.

Can I add custom words or exceptions to the checking rules?

The tool uses a fixed ruleset for proofreading and doesn't support customization of checking rules or exceptions. However, you can manually review flagged items to determine if they're actual errors.