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Plagiarism Checker

Check whether a draft still reads original.

Run a first-pass originality review with matched sources, sentence-level flags, and a direct handoff to Humanizer when a passage needs a cleaner rewrite.

Source matching Humanize flagged text
Your Text 0 words

Minimum 50 words recommended for accurate results

Paste text to start

Plagiarism results appear here

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

Process

How the originality check works.

01

Paste enough text to scan

Drop in at least 30 words, though 50 or more gives the checker more context for reliable source matching.

02

Run the originality pass

The tool looks for matching phrases across the web and scores the draft using direct matches, repetition, and sentence-level signals.

03

Review what was flagged

See the originality score, matched URLs, and flagged passages, then send risky text to Humanizer if you need a cleaner rewrite.

Pricing

Start free, scale when you need more checks.

Free
$0

3 checks each day, up to 300 words, full originality scoring.

Starter · Recommended
$9.99 /mo

Higher word limits, more daily capacity, and faster review cycles.

Pro
$19.99 /mo

Larger workloads, priority processing, and room for frequent checks.

See all plans →
Questions

What people ask before they scan.

How does the plagiarism checker work?
Our checker extracts key phrases from your text and searches the web for matches. When web search is available, it finds exact source URLs. It also analyzes text structure, cliche density, and vocabulary patterns to estimate originality even without web search.
Is the plagiarism checker free?
Free users get 3 checks per day with up to 300 words each. The checks include full originality scoring and per-sentence analysis. Upgrade for higher word limits and more daily checks.
What does the originality score mean?
The originality score ranges from 0-100%. A high score (green) means your text appears original. A low score (red) indicates potential matches with existing content online. Use the per-sentence view to identify which parts need rewriting.
Can I fix flagged text?
Yes! If sentences are flagged, click "Humanize Flagged Text" to send them to our AI Humanizer, which will rewrite them to be unique while preserving meaning.
Is my text stored?
No. Your text is analyzed in real-time and not stored permanently. Logged-in users get a brief history entry for convenience, but the full text is never retained beyond processing.
What word count do I need for accurate results?
A minimum of 30 words is required, but 50 or more words produce the most reliable results. Short snippets lack enough context for meaningful web matching. For academic or professional submissions, we recommend checking the full document rather than individual paragraphs.
Does it detect paraphrased plagiarism, not just exact copies?
The checker identifies both exact phrase matches and near-duplicate sentences. It also flags generic or clichéd language patterns common in AI-generated and template-copied text. For highly paraphrased content, some matches may score lower — always review flagged sentences in context.
Can it check academic papers and student essays?
Yes. Paste the full text of an essay, research paper, or report and the tool will scan it against web sources and assess sentence-level originality. For formal academic submission, this provides a useful preliminary check, but institutional plagiarism platforms (like Turnitin) may access additional databases.
How does this compare to Turnitin or Grammarly plagiarism?
Turnitin accesses proprietary academic databases we do not. Grammarly places plagiarism checking inside a broader writing workflow. Our tool focuses on an open-web first pass with matched source URLs and per-sentence analysis. Use it as a direct first check before institutional or broader writing platforms.
Does it work on mobile?
Yes. Paste text on your phone and tap Check. The originality gauge, matched sources, and per-sentence analysis are all fully responsive. You can also upload .txt files from your device.
Can I check content in languages other than English?
The tool works best with English text. Web matching may return results for other Latin-script languages, but the linguistic analysis (cliche detection, vocabulary patterns) is optimized for English.
What should I do after flagged sentences are found?
Click "Humanize Flagged Text" to send them to our <a href="/ai-humanizer">AI Humanizer</a>, which rewrites flagged passages to be unique. You can also run the rewritten text through our <a href="/ai-detector">AI Detector</a> to confirm it reads as human-written.
Can I download the plagiarism report?
Yes. Click "Download Report" to save a full .txt report containing the originality score, matched sources, flag summary, and per-sentence analysis. Useful for documentation or sharing with editors.
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Coda One's Plagiarism Checker scans your text against billions of web sources to detect copied content. Get an overall originality score, matched source URLs with similarity percentages, and per-sentence analysis highlighting flagged passages. If plagiarism is detected, use the built-in Humanize feature to rewrite flagged text into unique, original content. It is designed as a fast first pass in the web app before formal submission.