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Free Plagiarism Checker

Free

Check your text for plagiarism completely free with per-sentence analysis

Your Text 0 words

Free, no signup required · Ctrl+Enter to submit

Plagiarism results appear here

Paste at least 30 words and click Check Plagiarism to scan for copied content

How It Works

  1. 1

    Paste Your Text

    Copy and paste the text you want to check -- essays, reports, blog posts, or any written content. Minimum 30 words required; 50+ words recommended for the most accurate results.

  2. 2

    Scan for Matches

    The tool extracts key phrases from your text and searches the web for matches. It also analyzes sentence structure, cliche density, and vocabulary patterns to estimate originality.

  3. 3

    Review Results

    Get an overall originality score, matched source URLs with similarity percentages, and per-sentence analysis highlighting flagged passages. Use the Humanize feature to rewrite flagged text automatically.

Finding a reliable plagiarism checker that doesn't charge per scan or hide results behind a paywall is surprisingly difficult. Most "free" tools limit you to 250 words, blur out matched sources, or require account creation before showing results. Students, writers, and educators end up paying $10-30/month just to check whether their work is original -- an unnecessary expense when the underlying technology doesn't require it.

Coda One's Free Plagiarism Checker gives you real, actionable results without cost barriers. Paste your text and get an overall originality score, matched source URLs with similarity percentages, and per-sentence analysis highlighting exactly which passages need attention. Free users get 3 checks per day with up to 300 words each -- enough for most essay paragraphs, blog posts, and assignment submissions.

The tool works by extracting key phrases from your text and searching the web for matches. When matches are found, you see the exact source URLs and which sentences triggered the match. The per-sentence breakdown uses color coding -- green for original, red for flagged -- so you can immediately identify problem areas. If plagiarism is detected, use the built-in Humanize button to rewrite flagged passages into unique, original content without leaving the page.

Frequently Asked Questions

Is this plagiarism checker really free?
Yes. Free users get 3 plagiarism checks per day with up to 300 words each. Each check includes the full originality score, matched source URLs, and per-sentence analysis. No credit card required, no signup needed for basic use. Upgrade plans are available for higher word limits and more daily checks.
How accurate is a free plagiarism checker compared to paid ones?
Our free checker uses the same detection engine as the paid tiers -- web source matching, phrase extraction, and structural analysis. The difference is in daily usage limits and word count caps, not detection quality. For most individual use cases (checking an essay, blog post, or assignment), the free tier provides fully accurate results.
What are the limitations of the free version?
Free users are limited to 3 checks per day and 300 words per check. If you need to check longer documents, you can break them into sections and check across multiple days, or upgrade for higher limits. The detection quality and feature set (originality score, source matching, per-sentence analysis) are identical across all tiers.
Do I need to create an account?
No account is required for basic plagiarism checking. Simply paste your text and click Check Plagiarism. Creating a free account gives you check history and slightly higher limits, but it is entirely optional.
Can I check multiple documents for free?
You can run 3 checks per day on the free tier. Each check can be a different document or different sections of the same document. The counter resets daily, so you can check more documents tomorrow. For bulk checking needs, consider upgrading to a paid plan.

Also Available For

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