AI detection and plagiarism

Free AI detector and plagiarism checker

Check your assignment for AI-generated writing and unattributed sources before you hand it in. Sentence by sentence, with every matched source listed.

Free account required for scans. No credit card needed.

What the report gives you

Three signals, and the working behind each

A detection result is evidence to weigh. The report shows you where each score came from, so you can judge it.

A score for every sentence

Each sentence is scored on its own, so you can see which passages drive the result instead of guessing at one number.

Matched sources, with URLs

Every plagiarism match comes back with the page it came from, how many words matched identically, and how many matched loosely.

A readability score

How demanding your writing is to read, on the standard scale. Useful when a criterion asks for clear, fluent communication.

The per-sentence view

What a result looks like

Look at which sentence scores highest. The specific, slightly awkward, first-person one about the thermometer reads as human. The polished sentences around it read as machine, and those are the ones students are most often taught to write.

Example of the report format, using invented text

  • The experiment was conducted to determine the relationship between temperature and reaction rate.

    Reads as AI
  • It is important to note that a comprehensive understanding of this relationship is essential for interpreting the results effectively.

    Reads as AI
  • Our thermometer only read to the nearest degree, so the 40 °C trial was probably closer to 41.

    Reads as human
  • This limitation may have introduced a degree of uncertainty into the overall findings of the investigation.

    Reads as AI
Read this before you panic

Detectors flag real student writing

A detector measures how statistically predictable your text is. Formal academic writing is predictable by design, which is why careful students get flagged more often than careless ones.

Writing that follows a marking guide closely, uses subject terminology consistently, and holds a formal register is doing what the rubric asks. It also looks, structurally, like model output. That overlap is the whole problem.

So a high score on your own work tells you something about your prose style. Treat it as a reason to look closer at a passage, and be ready to explain your work. Our longer piece on why AI detectors flag real student writing covers what to do if it happens during a school investigation.

Rewriting to beat the score backfires

Degrading your writing to lower an AI score costs you marks against the rubric, and schools treat evasion as its own integrity issue. Revise a passage when it belongs to someone else. Keep it when it is yours.

How to use it

A sensible order of operations

  1. 01

    Scan while the draft can still change

    Run the check while you still have time to act on it. A flag a week out is something you can resolve. A flag the night before is just anxiety.

  2. 02

    Open the sources it matched

    Every match comes with a URL. Check each one. Most are coincidental phrasing, and the rest are usually something you read and paraphrased too closely, which needs a citation.

  3. 03

    Read the flagged sentences individually

    Skip the headline number and look at what it flagged. If a passage is yours, keep it. If you cannot remember writing it, you have your answer.

  4. 04

    Go back to the rubric

    Integrity is the floor. Once the work is honestly yours, what decides your mark is whether it meets the criteria.

FAQ

Common questions about AI detection

Are AI detectors accurate?
Every detector has a meaningful error rate, and any tool claiming otherwise is overselling. Detectors measure statistical patterns in writing rather than authorship, so genuinely human writing gets flagged, particularly formal academic prose. Treat a score as a prompt to look closer at a passage.
Why was my own writing flagged as AI?
False positives are common in academic writing. Predictable sentence structure, formal register, heavy use of subject terminology, and closely following a rubric all make writing look statistically average, which is what detectors measure. Writing to a marking guide is the exact behaviour that triggers it.
Can my teacher tell if I used AI?
Teachers have access to detection tools, and many schools run submissions through one. Because detectors are unreliable on their own, a flag usually starts a conversation or an investigation rather than settling it. Schools also weigh your drafting history, your usual writing, and whether you can explain your own work.
Is checking my own work before submitting it cheating?
Scanning your own draft to find unattributed sources or machine-sounding passages is an integrity practice. What matters is how you respond: revise flagged passages in your own words and attribute what needs attributing, rather than rewording purely to defeat a detector.
What does the plagiarism checker compare my work against?
The scan matches your text against published web sources and returns the URLs it matched, with a count of identical and loosely matched words. It has no access to your school’s private submission archive, so similarity to a classmate’s unpublished work stays invisible to it.
Do I need an account to run a scan?
Yes. Detection scans run against a paid third-party service, so they need a free account. Assignment feedback works without one: your first rubric-aligned report needs no sign-up.

Check it before
someone else does

Paste your draft, read the sentence-by-sentence breakdown, and fix what needs fixing while you still can.

Scan your work

Free account required for scans. Assignment feedback works without one.