Plagiarism Checker

Paste a passage and get a similarity score with the matching sources from Winston AI. 100 to 120,000 characters, 6 credits per 1,000.

Plagiarism Checker

Paste a passage and get a similarity score with the matching sources from Winston AI. 100 to 120,000 characters, 6 credits per 1,000.

Paste a passage and get a similarity score with the matching sources, powered by Winston AI. Scans run on 100 to 120,000 characters and cost 6 credits per 1,000 characters.

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A score and the sources behind it

Similarity score

Each scan returns a plagiarism percentage for the whole passage and the originality complement, so a result reads at a glance.

Named matching sources

The top overlapping sources come back with URL, title and match percentage, so you see exactly what the text matches.

Long documents in one run

Scans accept 100 to 120,000 characters, so essays, articles and reports fit whole instead of in chunks.

Priced by text size

6 credits per 1,000 characters with a 6 credit minimum. A 2,000 character scan costs 12 credits, shown before it runs.

Web source coverage

The text is compared against public web sources to surface copied or near-copied passages.

Results inside the chat

The score card arrives as a normal chat result: review it, rerun a shorter excerpt, or share the conversation.

From pasted text to sources in four steps

Type /plagiarism and paste the text

The passage goes right after the command. Anything from 100 to 120,000 characters works in one scan.

Check length and price upfront

Cost is 6 credits per 1,000 characters, so you know what the scan runs before it starts.

Read the similarity score

The result card shows the plagiarism percentage and how much of the passage reads as original.

Check the matching sources

The top overlapping sources list their URL and match percentage, so you can open each match and judge it.

Who uses the plagiarism checker

Students

Check your own draft before submission so nothing reads as unquoted copying.

Educators

Screen essays and assignments for passages that match published sources.

Editors and publishers

Verify freelance submissions and guest posts before they run.

Writers

Make sure quotes, citations and reworded sections are properly credited.

Agencies

Sign off on outsourced content with evidence it is original.

Copy a prompt, run it as /plagiarism

When a different tool fits better

Similarity is not intent

A match means overlapping text, not stolen work. Quotes, common phrases and your own published pieces can score too; judge the listed sources, not just the number.

Coverage is the public web

Scans compare against public web sources. Text behind logins, print-only works and private repositories are outside reach.

One-off free use

There is no free plan for scanning. Pro starts at $20 per month. For a single check, a free checker is enough.

Plagiarism checker questions

Is the plagiarism checker free to use?

Not fully. /plagiarism runs on credits at 6 credits per 1,000 characters of text. Pro is $20 per month and includes monthly credits.

What does the similarity score mean?

It is the share of the passage that overlaps sources the scan found. Matching text is not automatically plagiarism: quotes, citations and common phrases count toward the number.

What text length works best?

Between 100 and 120,000 characters per scan. Whole documents give more reliable matches than isolated sentences.

Can I check my own published work?

Yes. Paste any text you own or may scan; your own published pieces simply appear as matching sources.

Related tools and models

  • AI Detector

    Check whether a passage reads as AI written, not just copied.

  • AI Humanizer

    Rewrite flagged passages into natural phrasing.

  • AI Summarizer

    Condense long documents before scanning the key parts.

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