Plagiarism percentage
A clear similarity index, split into internet sources, publications and paraphrased text.
Introducing AI2Human V6a & AI Detector 3A — our most advanced models yet
Plagiarism checker · 1 free check every month
Free Plagiarism Checker with a source-by-source report
Check essays, assignments, theses and articles for copied text. We compare your writing with the live web, Wikipedia and over 250 million academic papers, then show the plagiarism percentage, every matching source and a downloadable PDF report.
- Plagiarism percentage
- Numbered sources
- PDF originality report
- Paraphrase detection
0 / 1,000 words
SMLJA
Trusted by 1,000+ students, teachers and writers
250M+
academic papers compared
10–30s
typical check time
20,000
words per check on Ultimate
5
interface languages
◇ How it works
Paste, check, review — in three steps.
No setup and no learning curve. The plagiarism checker does the searching and comparing for you, and explains every result.
- 01
Paste or upload your text
Paste up to 20,000 words or upload a PDF or Word document. Quotes and your reference list can be excluded automatically.
- 02
We search and compare
Distinctive passages are searched across the web, Wikipedia and academic papers, and each source is compared with your text word by word.
- 03
Review and download
See the similarity percentage, colour-coded highlights and numbered sources, then download a professional PDF report.
◇ Features
Everything a plagiarism check should show — nothing hidden.
Many free plagiarism checkers stop at a single number. Ours shows exactly where each match comes from, so you can fix it in minutes.
Numbered, colour-coded sources
Every match is highlighted in your text with the number and colour of its source.
Paraphrase detection
Pro and Ultimate also catch reworded sentences that keep the original meaning.
Exclude quotes & bibliography
Properly quoted passages and your reference list are left out of the score, like university tools do.
PDF originality report
Download a clean report with a cover page, source list and highlighted document to share with a teacher or client.
Private by design
Your document is not stored or added to any database, and it is never shown to other users.
◇ See every match
Find copied passages in seconds, not hours
Each matching passage is highlighted in the colour of its source, with a small number badge. Click any source to show only its matches and jump straight to them.
- Source percentages ranked from largest to smallest
- Direct links to every matching page
- Exact and paraphrased matches marked differently
◇ Built for students
Check your essay before your teacher does
Run your assignment through the plagiarism checker before you submit it. Fix missing citations and reword copied sentences, so your work reflects your own thinking.
- Academic papers and Wikipedia included
- Quoted, cited passages excluded from the score
- Works with PDF and Word uploads
◇ Share with confidence
A report your teacher or client can trust
The PDF originality report includes the similarity index, a numbered list of primary sources with links and your full document with highlighted matches.
- Professional cover page with report ID
- Highlights match the on-screen colours
- Ready to attach to an email or submission
◇ Who uses it
One plagiarism checker for everyone who writes
AI-powered tools for your writing needs
One platform. Five powerful tools. Everything you need to humanize, detect, and perfect your writing.
AI Humanizer
Transform AI-generated text into natural, human-sounding writing that reduces AI-detection signals across every major detector.
90–99% range
Human Score
Light, Medium, Heavy
Modes
40+ supported
Languages
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Free · No signup required
◇ FAQ
Plagiarism checker questions, answered
Is this plagiarism checker free?
Yes. Every free account gets one plagiarism check of up to 1,000 words each month, with the full report and PDF download. Paid plans add more checks, longer documents, file uploads and paraphrase detection.
How does the plagiarism checker work?
We select distinctive passages from your text and search for them across the web, Wikipedia and over 250 million academic papers. Every matching source is then compared with your text word by word to calculate the plagiarism percentage.
Does it detect paraphrasing?
Yes, on Pro and Ultimate plans. Sentences that were reworded but keep the same meaning are compared using semantic similarity and highlighted separately from exact matches.
What does the plagiarism percentage mean?
It is the share of your words that match other sources, after excluding quotes and your bibliography if you choose to. A low percentage with properly cited sources is normal for academic writing.
Can I download a plagiarism report?
Yes. Every check can be downloaded as a PDF originality report with the similarity index, numbered sources and your highlighted document.
Is my document stored or shared?
No. Your text is not saved after the check and is never added to a database or shown to other users. Only a few short phrases are sent to search engines to find matching sources.
Is it the same as Turnitin?
No. Turnitin also compares work against its private archive of past student submissions, which no public tool can access. Our checker covers the open web, Wikipedia and academic papers, which is where most copied text comes from.
How many words can I check?
Free accounts can check up to 1,000 words per scan, Basic up to 5,000 words, Pro up to 10,000 words and Ultimate up to 20,000 words.
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