Free plagiarism checker for content writers
Paste an article to see copied text and AI-written passages in one report, before you publish it or pay for it. Your first check is free, with no sign-up, up to 1,000 words.
- First check free, no sign-up
- Every matching source linked
- Never used to train AI
A report you can act on
A percentage tells you little about an article. The report shows which passages match, where they come from and which sentences read as AI-written.
Every matching source, linked
The plagiarism report links each matching source next to your text. You can open it, then attribute the passage or rewrite it.
An AI score and a sentence view
The AI check gives one overall score and a likelihood for every sentence, so you can see which passages the score comes from.
Both checks in one report
Run the plagiarism check and the AI check together. You read one report instead of pasting the article into two tools.
How to check an article before you publish in 4 steps
Paste the article
At least 30 words for plagiarism and 50 for the AI check. Without an account you can check up to 1,000 words at a time.
Run the check
Plagiarism is selected. Tick the AI option to run both in one report.
Open each match
Follow the link to the source. Decide whether it is a quotation with a source, a common phrase or a copied passage.
Fix it or ask about it
In your own draft, attribute or rewrite. In a submission, send the writer the passages and ask before you publish or pay.
For the person writing the article and the person publishing it
In-house content teams
Make the check a step before publishing, so copied wording is found in the draft and not on the live page.
Freelance writers
Check your article before you send it. If a client asks about originality, you have already read every match.
Editors and agencies
Check submissions before you accept them. The sentence view shows what to ask the writer about.
Site owners
Check a guest post before it goes on your site. You are the one publishing it.
Reviewing a submission? An AI score is a probability, not proof. Any detector can flag writing a person wrote, so it should never be the only basis for rejecting or accusing a writer. Read how AI detectors work and how to interpret a plagiarism report.
Check where you write
Paste text on this page, or run the check from the tools you already use.
In Google Docs
The Google Docs add-on checks a document for plagiarism, AI writing and grammar inside Google Docs.
In your browser
The Chrome extension adds a Check button to web text boxes with 50 or more words. It also checks text you highlight on any page.
In your publishing workflow
There is a REST API for plagiarism and AI detection. API access is on paid plans.
Get the Google Docs add-on or the Chrome extension. Developers: see the API. For longer documents and folders, see pricing.
What this check does not do
We would rather you know this before you rely on a report.
It does not rewrite or “humanize”
The report shows you what matches and what reads as AI-written. It does not change your text or help disguise it.
It does not judge attribution
A match can be a quotation with a source or a copied passage. The report shows the match. You decide which it is.
Other tools give other numbers
Each checker compares against its own sources and each AI detector uses its own model. Two tools can score the same article differently.
It does not crawl or monitor
It checks the text you give it. It does not crawl your whole website or watch the web for copies of your pages.
If another site has copied your published work, a checker cannot remove it. Our DMCA page shows what a takedown notice contains.
Copied text, AI writing and search
Short guides for writers, editors and SEO teams.
On search: duplicate content and SEO, is AI content bad for SEO? and can Google detect AI content? On writing: does ChatGPT plagiarize? and how to paraphrase without plagiarizing.
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Plagiarism checker questions from writers and editors
Check an article before you publish, free
Your first check needs no account, up to 1,000 words.