How does this plagiarism checker work?

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.

Is paraphrasing plagiarism?

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.

What is accidental plagiarism?

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.

Can I plagiarize myself?

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.

Do I need an account to check for plagiarism?

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.

Plagiarism Checker

Detect plagiarism, fix duplicate content, and verify your document in minutes.

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

One upload, every check.

Plagiarism is one of the checks your reviewer will run. The Full Check runs it alongside AI detection, grammar, and readability on the same document, and ends in a verification report you can hand over — proof you can stand behind.

What this check looks for — honestly.

It matches your text against published web sources and shows you each match with its source and the overlapping passage — no naked scores, every finding explains what was found and why it matters.

And the honest part: no tool sees every source another checker sees. A clean result is strong evidence your text is original — not a guarantee, and we won't pretend otherwise. You're checking your own work, privately, before it counts.

Sample finding Source overlap

The mitochondria is often described as the powerhouse of the cell, converting nutrients into usable energy through cellular respiration.

Matched source92% overlap

Encyclopaedia — “Cell biology: energy and metabolism”

A common phrase lifted verbatim from a published source. Quote and cite it, or rewrite it in your own words — then re-check to confirm it's resolved.

See what your reviewer will see — first.

A matched passage looks the same to a reviewer whether you copied it on purpose or paraphrased it too closely by accident. Run that scrutiny privately, first, and fix what you can.

Step 1

Find

See each matched passage with its source, explained.

Step 2

Fix

Cite it, rewrite it, or clear it — your call, in the document.

Step 3

Re-check

Confirm it's resolved before you submit.

Checked for matches. Here's the next worry.

Check for AI detection

The same submit-moment fear from the other side — now see how likely your text is to be flagged as AI, with the uncertainty shown.

Check my document

Compare two texts

Rewrote a passage from a source? Compare your version against the original side by side to see exactly what still overlaps.

Compare texts

Before you paste your document

"Your detector isn't the one my client or school uses."

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.

"Is my unpublished work safe?"

Never indexed, never resold, never used for training. Retention controls on every plan — paste a thesis chapter or a client deliverable with the same confidence either way.

Frequently asked questions

This was one check. This document deserves all of them.

Check for plagiarism free, see what matched, then run every check your reviewer will on the same document.