Grammar Checker

Grammar Checker catches spelling mistakes, punctuation errors, and grammatical issues before you hit send — paste your text, click check, and fix each flagged issue in one click.

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Idle LanguageTool API · English (US)

How to Use

Step 1

Paste or Type Your Text

Enter the text you want checked into the input box on the left — anything from a short email to a longer document, essay, or cover letter.

Step 2

Click Check Grammar

Press the Check Grammar button to run your text through the checking engine, which scans for spelling, punctuation, and grammatical errors in just a couple of seconds.

Step 3

Review Flagged Issues

Look through the Issues & Corrections panel, where each detected problem is listed clearly with a brief explanation of what's wrong and exactly why it was flagged.

Step 4

Accept Corrections or Copy Your Text

Apply suggested fixes with a single click each, or copy your polished final text once you've reviewed and accepted the changes you actually want to keep.

Key Features

Real-Time Grammar Checking

Real-Time Grammar Checking

Instantly detects complex grammatical issues, misplaced punctuation, and structural errors as you check your content.

Instant Spelling Correction

Instant Spelling Correction

Automatically highlights typos and offers accurate spelling alternatives to keep your text flawless.

Issues & Corrections Panel

Issues & Corrections Panel

Organizes detected errors neatly on the side panel with clear explanations and single-click fixes.

One-Click Actions

One-Click Actions

Quickly check, reset, or copy your updated text using intuitive, streamlined interface controls.

Frequently Asked Questions

It flags spelling mistakes, punctuation errors, and grammatical issues in your text, showing each one clearly in a side panel with a plain-language explanation so you understand exactly what's being corrected and why it matters.

This tool runs on the LanguageTool checking engine for English (US), a widely used and well-established grammar and spell-checking system, rather than a fully generative AI rewriter that rephrases your sentences for you automatically.

No — it flags individual issues for you to review and accept one at a time, rather than silently rewriting your whole document's tone, style, or meaning without your input or approval.

No — each flagged issue is a suggestion you can accept or ignore individually, so you always stay in full control of your final wording instead of handing that decision over entirely to the tool.

No — your text is processed only for checking purposes and is not stored on our servers afterward, so drafts, private messages, and unpublished documents stay confidential throughout the entire check.

Yes, it's completely free to use with no signup required, for checking as much text as you need, whether that's a short email or a full cover letter.

Grammar Checker is built for quick proofreading, not full rewrites. It's powered by the LanguageTool checking engine for English (US) and flags each issue in a side panel with a clear explanation and a one-click fix, keeping you in control of your final wording — for a client email, cover letter, or social post.