Free Plagiarism Checker Online — Detect Duplicate Content
Scan up to 1,500 words against billions of web pages. No sign-up, no data storage. Instant results.
Paste your text below (up to 1,500 words). We'll scan it against billions of web pages and highlight any matching content.
No analysis yet. Paste text and click "Check Plagiarism."
You wrote something original. Or you think you did. Either way, you need to know before someone else finds out.
This free plagiarism checker scans your text against indexed web pages, academic sources, and public domain content. Paste up to 1,500 words. Get results in seconds. No sign-up. No file storage. Just a straight answer about whether your content is unique.
Below the tool, you'll find everything else: how plagiarism checking works, who needs it, and why you shouldn't panic about a 5% match score.
What Is a Plagiarism Checker?
A plagiarism checker compares your text against existing published content to find overlapping phrases, sentences, or paragraphs. Think of it as a reverse search engine. You give it your words. It looks for those same words elsewhere.
Most checkers, including this one, break your text into smaller chunks — usually 5-10 word sequences. Then they query those sequences against a database of crawled web pages. When a match appears, the tool flags it and shows you the source.
Here's what a plagiarism checker cannot do: prove intent. A match doesn't automatically mean you copied something. It means your wording matches existing text. That could be a coincidence, a common phrase, or a properly cited quote that still shows up as a match.
Why accuracy varies between tools
Paid tools like Turnitin or Grammarly Premium maintain massive proprietary databases. Linkrify's free plagiarism checker uses a smaller but still useful web index. You'll catch most direct copy-paste plagiarism. You might miss content from behind paywalls, recent academic papers, or obscure forums.
That trade-off is honest. We don't claim to find everything. We claim to find a lot, fast, for free.
Who Should Use a Plagiarism Checker?
Students & academic writers
Professors run your papers through detection software. Run yours first. Catch accidental overlaps before submission.
Bloggers & content creators
Google penalizes duplicate content. Check drafts before publishing — a 60% match to another post means rewrite.
SEO & marketing teams
Agency life means hundreds of pages. Plagiarism happens by accident when writers reuse source material.
Researchers & journalists
Fact-checking includes source checking. Did that press release get copied verbatim? Verify before publishing.
How Linkrify's Plagiarism Checker Works
Step 1: Paste text
Accepts up to 1,500 words (~3 pages). Higher limit than most free tools.
Step 2: Break it down
Text split into overlapping search phrases, generating hundreds of queries.
Step 3: Web search
Compares against a pre-built index updated weekly. No live crawling delay.
Step 4: Results
Matches shown with source links & percentage. No text storage, ever.
Tips for Avoiding Accidental Plagiarism
Cite everything
If it's not common knowledge, cite it. "Water freezes at 32°F" needs no citation; a specific discovery does.
Quote exactly, then attribute
Quotation marks + source. Changing two words isn't enough — that's still plagiarism.
Paraphrase properly
Read, close source, write in your own words. Don't just swap synonyms.
Use multiple sources
Pull from 3-4 sources; your combination won't match any single one.
Frequently Asked Questions
How accurate is your free plagiarism checker?
Catches direct copy-paste from indexed pages reliably (~85-90%). Won't catch paywalled content. Paid tools have larger DBs.
How many words can I check for free?
Up to 1,500 words per search. Larger than most free alternatives (often capped at 500-1000).
Do you store the text I paste?
No. Text is held in memory only during comparison, then deleted. No AI training, no sharing.
What counts as plagiarism?
Copying text without credit, including verbatim copying, close paraphrasing, self-plagiarism, and patchwriting.
How is this different from paid checkers?
Smaller database, but free. Use us for quick checks; use Turnitin for thesis submissions.
Can I check a URL instead?
Copy text from the page and paste. URLs contain noise (menus, ads) that skew results.
Does a 10% match mean I plagiarized?
Probably not. 5-15% is normal (common phrases, citations). Check the sources.
What file formats?
Plain text only. Paste from Word, PDF, etc. Formatting doesn't matter.
Good for SEO content?
Yes, for basic duplicate detection before publishing. For ongoing monitoring, use Copyscape.
Can teachers use this?
Yes. Paste submissions, get match %. Free, no student accounts, no data retention.
Check Your Text Before Someone Else Does
Paste your text. Hit check. Most of the time, you'll get a clean result — but catching problems early is the whole point.