DetectGPT · free self-check
Free Turnitin AI Checker and Plagiarism Checker
Looking for a Turnitin® Alternative?
Here is how DetectGPT compares
Turnitin® keeps plagiarism and AI checks inside a school license. Most students never open either score until they submit, unless the course has a draft preview such as Draft Coach switched on.
DetectGPT is the check you run yourself. Paste the document, catch public overlap you did not mean to leave in, and see which lines sound too even before you edit them.
Draft
Paste your text here
or upload a file to get started
AI writing report
Waiting on a draft
Flagged passages come back light yellow over 20%, then yellow, orange, or red.
DetectGPT is an independent AI checker and plagiarism checker. It is not affiliated with, endorsed by, sponsored by, or connected with Turnitin, LLC. Turnitin® is a trademark of Turnitin, LLC. This page does not use Turnitin’s software, algorithms, or systems, and results may differ from Turnitin’s AI-writing detection and similarity results.
A lot of people land here because the course uses Turnitin and the student cannot open the report. They want a Turnitin AI checker they can run tonight, and they want a Turnitin plagiarism checker in the same sitting, without borrowing a login. DetectGPT is that self-check. Paste the draft, read the AI percentage, then switch to the plagiarism tab and see which lines already live on the public web.
Those are two different questions. A plagiarism checker looks for overlap. An AI checker looks at how the sentences are built: even rhythm, safe wording, flat turns. A paper can copy nothing and still sound generated, and a careful literature review can overlap sources without sounding like a model. DetectGPT keeps the two scores apart so you do not treat one percentage as both.
The box above is the product. Text is the AI checker. Plagiarism is the similarity score check. History keeps the runs on this device. There is no account, the cap is 3,000 words per run, and you can run it as many times as the draft needs. It is not Feedback Studio, and it will not become the official score just because the search said “Turnitin.”
At a glance
| Factor | On DetectGPT |
|---|---|
| Best for | Students who need a free check before the course dropbox |
| Turnitin AI checker | Text tab. An AI percentage on the draft you paste |
| Turnitin plagiarism checker | Plagiarism tab. Public-web overlap, sources, and highlights |
| School login | No. DetectGPT is not Feedback Studio |
| Cost | Free, no signup |
| Word cap | 3,000 words per run. No daily cap on how many runs |
| History | Saved on this device, not in a school account |
| Official score | No. Results can differ from Turnitin |
Why students search for a free Turnitin checker
The search is practical. Someone has a paper due, the assignment uses Turnitin, and the AI score is not a button the student can press. A second search, usually a few minutes later, is for a free plagiarism checker that still sounds like Turnitin. DetectGPT exists for that gap. You bring the draft you already wrote, including a ChatGPT, Claude, Grok, or Gemini draft you then edited, and you see a percentage before the dropbox does.
What you should not expect is a rented login. Turnitin is licensed to institutions. A page that offers “Turnitin free” as an account is not handing you Feedback Studio. If you want the path a file actually takes after you submit, read how Turnitin works and then come back here to check the draft you still control.
A Turnitin plagiarism checker and a Turnitin AI checker are different reports
The plagiarism side compares the file with a huge index: other submitted papers, crawled pages, and licensed publications. That is why a free plagiarism checker and a campus Turnitin plagiarism checker can disagree. DetectGPT sees public pages. It does not see last year’s unpublished essay from your department. The similarity score on this page is still useful for quotes you forgot to mark and for paragraphs that already sit on the open web. The longer reading of the campus badge is what the Turnitin similarity score means.
The AI side does not search ChatGPT. It scores style. Turnitin’s own indicator is their classifier, which is not GPTZero. DetectGPT is a third model again. Short passages, very formal academic prose, and some second-language writing can look more machine-like than they are. A percentage under about 20% is noisy on most checkers. Your course policy is the rule, not a number a stranger’s blog invented.
DetectGPT vs Turnitin
Use the column that matches the job. DetectGPT is the check you can run yourself. Turnitin is the report the course already bought. Neither column reprints the other.
| DetectGPT | Turnitin | |
|---|---|---|
| Who can open it | Anyone with the draft | A school or publisher license |
| Cost to a student | Free | Whatever the institution pays |
| Turnitin AI checker | AI percentage on this page | AI writing indicator, often instructor-only |
| Turnitin plagiarism checker | Public web overlap and source links | Campus archive, journals, and the web |
| School login | No | Yes, through the LMS |
| Self-check before submit | Yes | Usually no, or only if the instructor allows it |
| Word cap | 3,000 per run | The assignment file |
| History of your checks | On this device | On the assignment |
| Feedback Studio | No | Yes, that is the instructor view |
| What the percentage proves | A signal about this draft, not a verdict | The course report, still not proof of who typed it |
Where each tool is strong, and where it stops
DetectGPT
- Free for a student, with no account and no school login.
- An AI percentage and a plagiarism check on the same draft.
- History of your own runs, kept on this device.
- 3,000 words per run, and no daily cap on how often you check.
It stops at the text you paste. It does not hold the private paper archive, and a high or low score is not a hearing.
Turnitin
- The report the instructor actually opens.
- A plagiarism index that includes student papers, not only the public web.
- Feedback Studio, comments, and the LMS dropbox.
- An AI writing indicator when the school turned that feature on.
It stops being useful the night before, if you cannot see the score until after you submit. That is the limit DetectGPT is built around.
How to run both checks on this page
- Paste the draft into the Text tab, or upload a .txt file. Stay between 50 and 3,000 words.
- Run the AI checker and read the percentage with the highlighted lines, not as a pass or a fail.
- Open Plagiarism on the same text. Read the matching phrases and the source links before you decide the overlap is a problem.
- Use History if you want the earlier run back. Then fix quotes, citations, and the stiff paragraphs yourself.
If the worry is specifically how a campus plagiarism report is built, the walkthrough is how the Turnitin plagiarism checker works. The check you can do tonight is still the box at the top of this page.
What DetectGPT cannot do
DetectGPT cannot log into Turnitin, cannot show you Feedback Studio, and cannot promise that a low AI percentage will survive the course. It also cannot search a closed journal or a classmate’s unpublished file. If you searched for a Turnitin humanizer, that is a rewrite, and this page does not rewrite. DetectGPT’s job is the score. A humanizer is a different product, including HumanizeAIText, and even a rewrite is not a guarantee.
Do not paste someone else’s private work, and do not paste passwords or anything you would not want fetched as plain text. The AI score is a style signal. The plagiarism score is public overlap. Your instructor still reads the paper.
FAQs
- Can I check a paper before the Turnitin dropbox?
- Yes. DetectGPT is the check on this page. Paste the draft into Text for an AI percentage, then open Plagiarism for public-web overlap. You still submit through the course if the assignment requires it.
- What does the plagiarism tab actually compare?
- Public pages. DetectGPT highlights matching phrases and lists the source links. It does not look through your school’s private paper pile, so a classmate’s unpublished file can stay invisible here and still show up on campus.
- Why can’t I see the AI score my instructor sees?
- That indicator sits on the school license, often in Feedback Studio. Many courses never show it to the student. DetectGPT gives you a separate percentage on the draft you paste. It is not their screen and it will not match their number.
- Does Draft Coach mean I already have a free checker?
- Only if your instructor turned that preview on for the assignment. If you cannot find it in the course, you do not have a personal Turnitin login. This page is the check you can open anyway.
- What should I do with a high similarity percentage here?
- Open the sources before you panic. A bibliography, a quoted paragraph, or a shared assignment prompt can raise the number. Mark the quotes, cite the lines that match a public page, and leave the rest if it is yours.
- What should I do if the AI percentage looks high?
- Read the highlighted lines out loud and rewrite the ones that sound flat. DetectGPT does not rewrite them for you, and a lower score afterward is not a promise that the course report will agree.
- Can DetectGPT open Feedback Studio?
- No. There is no school login on this page, no roster, and no comments thread. History only keeps the checks you ran in this browser.
- Is the report on this page the one my instructor gets?
- No. Your instructor gets the campus report. You get DetectGPT’s reading of the same draft: one score for how machine the writing sounds, and another for overlap with the public web.
The bottom line
DetectGPT is the free checker for the two searches that usually arrive together: a Turnitin AI checker you can open, and a plagiarism checker that is not locked to the school. Run both on the draft, read the lines, and submit through the course when the course requires it. The official report is still theirs. The rehearsal is yours.
Check a draft