Plagiarism Checker

Paste your text and run the check. It compares your writing against billions of published web pages and flags any passage that overlaps with an existing source — showing you the match, where it came from, and why it matters. No naked score: every finding explains what was found so you can decide whether to cite it, rewrite it, or leave it. When you're ready, run the Full Check on the same document to cover AI detection, grammar, and readability too.

The free preview covers up to 500 words with no account — paste, check, and see your matches right away. The check needs at least 50 words to produce a reliable reading, so very short fragments are refused rather than given a noisy score. For longer documents, a plan removes the cap and checks against your word balance instead.

The Upload File button reads plain-text files: .txt and .md. Working in Word or Google Docs? Just copy your text and paste it in — nothing is lost, and the check runs on exactly what you pasted. Formatting isn't needed for matching, so paste is the fastest path for any document.

Every match it reports is real: the overlapping passage is shown next to the live page it came from, so you can verify each finding yourself instead of trusting a score. On the other side, no checker sees every source that exists — paywalled archives and unindexed pages are invisible to any web-matching tool. That's why a clean result here is strong evidence of originality, not a certificate, and why we show you the evidence rather than just a number.

The score is the share of your document that overlaps with published sources: matched words divided by total words. Under it, the report breaks the number down — which passages matched, which website each one came from, and how much of your document each source accounts for — so a 20% score is never a mystery, it's a list of findings you can open and resolve one by one.

There is no universal safe number — institutions and publishers set their own thresholds, and a properly quoted, cited passage can raise your score without being plagiarism at all. What matters is what the matches are: uncited overlap needs fixing at any percentage, while cited quotes and common phrases usually don't. Review each finding rather than chasing a target number.

It can be. Paraphrasing that keeps the original structure or ideas without crediting the source is still plagiarism, even when none of the words match exactly. Rewriting in your own words is fine — but if the idea isn't yours, it still needs a citation. When you're unsure, check the passage against its source and add attribution.

Partially — and honestly, that's true of every checker. Close paraphrasing that keeps the source's wording or structure will usually still match, because enough of the original phrasing survives. A thorough rewrite that keeps only the idea won't match any web-comparison tool — which is why the check is one half of the answer and your citations are the other. If an idea isn't yours, cite it whether or not anything flags.

Most plagiarism isn't deliberate. It happens when you forget a citation, paraphrase too closely, reuse a phrase you read months ago, or lose track of which notes were quotes. A reviewer can't tell intent from the text — a match looks the same either way — which is exactly why checking your own work first, privately, catches these before they count against you.

The main types: direct plagiarism (copying text word for word), mosaic or patchwork plagiarism (stitching phrases from several sources into your own sentences), close paraphrasing (rewording while keeping the structure or ideas uncredited), self-plagiarism (reusing your own submitted work undisclosed), and accidental plagiarism (missing citations or forgotten quotes). The check surfaces the overlap; the fix — cite, quote, or rewrite — depends on which kind it is.

Yes — reusing your own previously submitted or published work without disclosing it is self-plagiarism, and many schools and publishers treat it as seriously as copying someone else. If you're building on an earlier paper of your own, cite it like any other source. The check flags overlap with published text regardless of who wrote it, so you can catch reused passages before you hand the document in.

True — no one can promise another tool's verdict. But a documented clean pre-check catches the issues you can fix and changes the conversation if a dispute happens. That's what the report is for.

Your documents are never indexed, resold, or used to train detection models.

No. The in-page check above is free and needs no login — paste your text and see what matched right away. You'll create an account only when you want to see every finding, the fixes, and your full verification report, or to run the Full Check on the whole document.