Is DetectGPT a free plagiarism checker?

Yes. Paste up to 3,000 words with no account and run a plagiarism check online. You get a percentage, highlighted matches, and source links for public pages. It is not a paid Grammarly scan and it is not a school Turnitin® report.

Is there a plagiarism checker for students I can use without a school login?

This one. Students can check an essay, assignment, or paper in the browser before class. You still submit through the school dropbox if the course uses one.

Does the plagiarism detector show a percentage, sources, and highlights?

Yes. The report is a similarity percentage plus color on the matched lines and a source list next to each hit, so you can see what overlapped instead of staring at a crayon.

How does this compare to Turnitin, Grammarly, Copyleaks, or QuillBot?

Turnitin® is a campus archive most students cannot open at home. Grammarly’s plagiarism checker is usually paid. Copyleaks and QuillBot sell their own scanners. DetectGPT is a free public-web check with a percentage and sources. None of them reprint another’s number.

Can I check an essay, paper, or assignment online?

Yes. Paste the body of the homework, article, or thesis chapter, stay under 3,000 words, and run the checker. Split longer work. Do not paste secrets or someone else’s unpublished file.

Does a plagiarism checker also detect AI writing?

Not by overlap. Brand-new ChatGPT text can score low here because it never lived on a public page. Use the Text checker on the DetectGPT homepage for AI writing, then come back here for copied wording.

Is DetectGPT the same as GPTZero, Originality.ai, or Copyleaks?

No. Those are other companies. DetectGPT is a free plagiarism checker and AI writing checker on this site. Use the report as a draft pass, not as a screenshot against someone else’s dashboard.

Free Plagiarism Checker (Turnitin Alternative)

Free plagiarism checkerby DetectGPT

Online plagiarism detector for students, essays, and assignments

Check plagiarism online without a school login. Paste an essay or assignment, get a percentage, highlights, and sources. DetectGPT is a free plagiarism checker for students, not a Turnitin® or Grammarly report.

3,000 words
No account
Sources
For students
Ridiculously fast

Similarity Score Check

Try an example:

0 / 3,000 wordsUpload .txt

Similarity report

Waiting on a draft

This looks for matching phrases on the public web. It is not Turnitin, and it does not search a student paper archive.

Independent detector. Not affiliated with Turnitin®, and not their software.

Why people use this free plagiarism checker

Most “plagiarism checker for students” searches are the same job: someone has an essay due and no campus login. DetectGPT lets you check plagiarism online, see a percentage with sources and highlights, and fix the lines that already live on the public web.

Free, no account
Open the checker in a browser. No signup, no campus license, no card.
Percentage and source list
See how much overlapped the public web, then open the pages that matched.
Essays, assignments, papers
Built for the drafts students and writers actually paste before a deadline.
Highlights on matched lines
The report marks the phrases that already live on another page, not a mystery badge.
3,000 words per run
Paste a full essay-length draft. Split anything longer and run it in chunks.
Public web overlap
It looks at public pages. It is not Turnitin’s private database and not their report.

Quick reference

At a glance

Best for: Students, teachers, and writers who need a free plagiarism checker online
Job: Check an essay, assignment, paper, or blog draft for copied wording
Cost: Free, no account
Unlimited words: Unlimited checks, no daily cap. 3,000 words per run
Word cap: 3,000 words per run. Split a thesis or dissertation
Output: Percentage, highlighted matches, and source links
Report: On-screen similarity report you can read before you submit
Campus archive: No. It does not search other students’ unpublished papers
AI writing: Separate Text checker on the DetectGPT homepage
Turnitin® / Grammarly: Different products. This will not reprint their reports

The tell

What this plagiarism checker looks at

A plagiarism detector of this kind looks for stretches of an essay or assignment that already appear on public web pages, then highlights those lines and lists the source. It does not search a school paper archive, and it does not log into Grammarly, Copyleaks, or Turnitin®.

Quoted textbook lines and common methods language can raise the percentage without anyone copying an essay. Read the sources and the highlights before you treat the report as a verdict.

The number

How to read the percentage

People search for a plagiarism checker with a percentage because a single crayon is useless. The number here is the share of the draft that matched public pages, with highlights and citations attached. A high score can be a forgotten quote. A low score can still miss a classmate’s unpublished paper.

Low percentage
Little matched the open web. Unpublished sources can still be missed.
Some overlap
A quote, a methods paragraph, or reused blog copy. Open the sources.
High percentage
A stretch of the draft already lives on a public page. Cite it or rewrite it.

Walkthrough

How to check plagiarism online

1
Paste at least 50 words from the essay, assignment, or paper.
2
Stay under 3,000 words, or split a longer thesis chapter.
3
Hit Check similarity and wait for the report.
4
Read the percentage, the highlights, and the source list.
5
Cite or rewrite the overlapped lines and keep a copy of each version.

Boundaries

What it is not

This is a free plagiarism checker and plagiarism detector for public web overlap. It is not a Turnitin® similarity report, not Grammarly’s paid scanner, not Copyleaks, and not proof of authorship.

If the worry is AI tone rather than copied wording, use the DetectGPT homepage Text checker. Brand-new ChatGPT prose can score low here because it never lived on a public page.

Audience

Who the free checker is for

Students
A plagiarism checker for students who need to check an essay, assignment, or paper online before class, without a school scanner.
Teachers and writers
A fast pass over homework, articles, and blog drafts when you want sources and highlights, not a campus seat.
People writing in a second language
Common academic phrasing can raise the percentage without being a lift. Read the sources instead of panicking at the badge.

Side by side

DetectGPT vs Grammarly vs Turnitin®

People type Turnitin plagiarism checker, Grammarly plagiarism checker, Copyleaks, QuillBot, and GPTZero because they want a report they can actually open. DetectGPT is the free plagiarism checker on this page. Grammarly’s overlap scan is usually paid. Turnitin® is the campus report most students never see until after they submit.

	DetectGPT	Grammarly	Turnitin®
Who can use it	Anyone in a browser	Account, paid plagiarism on most plans	School or publisher license
Cost	Free	Free grammar, plagiarism usually paid	Whatever the institution pays
School login	No	No	Yes, through the LMS
Student access	Yes, paste and run	Limited unless you pay	Only inside the course dropbox
Percentage	Yes	Yes on paid scans	Yes, similarity score
Sources and highlights	Yes, next to each hit	Yes on paid scans	Yes, in the similarity report
What it matches	Public web pages	Web plus paid index	Web, journals, student papers
AI writing check	Separate free tab	Separate product	Separate AI indicator
Official campus tool	No	No	Yes

Turnitin® is a registered trademark of Turnitin, LLC. DetectGPT is not affiliated with Turnitin® or ZeroGPT.

Limits

What this checker cannot do

It cannot search a school’s private paper archive the way Turnitin® does.
It cannot reprint a Grammarly, Copyleaks, or campus similarity report.
It cannot scan images, slides, or scanned PDFs. Paste the prose.
It cannot catch brand-new AI text that never lived on the web.
It cannot bless an assignment against a syllabus. Policy still sits with you.

FAQs

Is DetectGPT a free plagiarism checker?: Yes. Paste up to 3,000 words with no account and run a plagiarism check online. You get a percentage, highlighted matches, and source links for public pages. It is not a paid Grammarly scan and it is not a school Turnitin® report.
Is there a plagiarism checker for students I can use without a school login?: This one. Students can check an essay, assignment, or paper in the browser before class. You still submit through the school dropbox if the course uses one.
Does the plagiarism detector show a percentage, sources, and highlights?: Yes. The report is a similarity percentage plus color on the matched lines and a source list next to each hit, so you can see what overlapped instead of staring at a crayon.
How does this compare to Turnitin, Grammarly, Copyleaks, or QuillBot?: Turnitin® is a campus archive most students cannot open at home. Grammarly’s plagiarism checker is usually paid. Copyleaks and QuillBot sell their own scanners. DetectGPT is a free public-web check with a percentage and sources. None of them reprint another’s number.
Can I check an essay, paper, or assignment online?: Yes. Paste the body of the homework, article, or thesis chapter, stay under 3,000 words, and run the checker. Split longer work. Do not paste secrets or someone else’s unpublished file.
Does a plagiarism checker also detect AI writing?: Not by overlap. Brand-new ChatGPT text can score low here because it never lived on a public page. Use the Text checker on the DetectGPT homepage for AI writing, then come back here for copied wording.
Is DetectGPT the same as GPTZero, Originality.ai, or Copyleaks?: No. Those are other companies. DetectGPT is a free plagiarism checker and AI writing checker on this site. Use the report as a draft pass, not as a screenshot against someone else’s dashboard.

Paste the draft

Paste up to 3,000 words into Similarity Score Check.

Read the overlap

A percentage plus the public pages that matched.

Cite or rewrite

Open the source list and keep a copy of each version.

The bottom line

Paste the essay, run the free plagiarism checker, and read the percentage, highlights, and sources before you treat the badge as a verdict. Keep a copy of each version.

DetectGPT will not replace a campus scanner, but it will show students and writers which public pages overlapped with a draft, and that is the part worth fixing tonight.

Try DetectGPT free today