Plagiarism check
Upload your thesis, essay or paper and get your plagiarism score free. Our plagiarism checker searches the web, 80+ million scholarly articles and translated sources, and gives you a clear answer before your teacher or journal does.
- ✓Free plagiarism score, risk score and AI detection score
- ✓Finds text matches across 100+ languages and translated matches across 50+ languages
- ✓Your document is never added to a database or shared with your university
No credit card needed. Word, PDF, Pages, PowerPoint, HWP or pasted text.
How to check your paper for plagiarism in 3 steps
Upload or paste
Upload a Word, PDF, Pages, LibreOffice, PowerPoint or HWP file up to 100 MB, or paste your text. Any of 100+ languages.
Get your free scores
In minutes you see your similarity, plagiarism risk, paraphrasing, cross-language and AI detection scores, plus a citation and reference check.
Fix and submit with confidence
Open the full report to see every match, its source and a downloadable PDF. Fix your citations, or ask our academic editors for help.
Join millions of students
Millions of students have checked their work with our plagiarism checker since 2011. Start today — your first plagiarism score is free.
Start free. Open the full report when you need the details.
Every upload gets a free plagiarism score, so you know straight away whether your text is safe. If you need to see what exactly was matched and where it came from, open the full report.
| Feature | Free | Full report |
|---|---|---|
| Similarity score | ✓ | ✓ |
| Plagiarism risk evaluation | ✓ | ✓ |
| Cross-language (translated) score | ✓ | ✓ |
| AI detection score | ✓ | ✓ |
| Citation and reference evaluation | ✓ | ✓ |
| Unlimited uploads and text pastes* | ✓ | ✓ |
| Full text with highlighted matches | – | ✓ |
| Direct links to every source | – | ✓ |
| Downloadable PDF report (proof of originality to print, store, share or submit) | – | ✓ |
* Fair usage: up to 10 documents per hour.
More than a percentage: how our plagiarism detection scores your text
Most plagiarism checkers give you one number. We give you four, because one number can hide real problems. Together they tell you how much of your text matches other sources, how risky those matches are, and whether anything was rewritten or translated.
Similarity score: how much of your text matches other sources
The similarity score is the share of words in your document that match existing sources. It is calculated by dividing matched words by the total word count. Example: a 1,000-word essay with a 21% similarity score has 210 matched words.
Plagiarism risk score: is it a quote or a copied page?
The plagiarism risk score shows how likely it is that matches are real plagiarism, based on the size of matched blocks. Ten short quotes spread across a thesis are normal. One copied page is not, even if the overall similarity is only 1%. The risk score catches this so a low percentage never gives you false confidence.
Short quotes spread across the thesis
Risk: LowOne copied page
Risk: HighParaphrasing score: catches text that was reworded
Rewording someone else’s text without credit is still plagiarism, and it is now the most common kind. The paraphrasing score shows how much of your text looks rewritten from an existing source. It usually falls between 1% and 8%. A higher score marks passages worth a second look.
Cross-language score: finds plagiarism in translated text
Translating an English article into your language does not make it original. Our cross-language detection compares your text with sources in other languages and flags translated passages. Most plagiarism checkers cannot do this.
AI detection score
See how much of your text may be AI-generated before your teacher’s tools flag it.
Citation and reference check
Checks that your quotes and reference list are complete and correctly formatted, so properly cited text is not mistaken for plagiarism.
Direct links to every matched source
The full report links each highlighted passage to the source it matches. You can see whether a quote is cited correctly, add a missing reference, or rewrite a passage, all from one screen.
A truly multilingual plagiarism checker
Most plagiarism tools are built for English. Ours was built for every student: we check texts written in 100+ languages against sources in your language, and also against sources in other languages.
- Your language, properly checked: local journals, theses and websites are in our sources, not only English ones.
- Translated plagiarism detected: copying a foreign article and translating it is caught by our cross-language detection.
- Mixed-language papers: a thesis with English quotes and a local-language body is checked in both.
EN
LT
LV
PL
ES
PT
DE
FR
UK
ID
RO
ITOne plagiarism scan, millions of sources
A plagiarism checker is only as good as the sources it compares your text with. Each scan covers four source groups at once.
Public web, checked in real time
Books, journals, encyclopedias, magazines, newspapers, blogs and other openly available content. We also search the live web during your scan, so articles published days ago are included.
80+ million scholarly articles
Papers from the best-known academic publishers, so academic works and theses are compared with real research, not just websites.
Web archive since 2011
More than a decade of indexed documents. We can find plagiarism from pages that have since been deleted or moved.
Sources in other languages
Cross-language detection compares your text with sources written in other languages.
Your work stays yours
Your document is used only to check it for you. Nothing else.
- ✓We never add your document to a comparison database. Your thesis will not show up as a “match” when you, or anyone else, submit it later.
- ✓We are independent. We do not belong to any university, so we never share your documents with teachers, professors, universities, government institutions or any third parties.
- ✓Check drafts safely. Check a chapter today and the final version next week without it matching itself.
| Us | Many other checkers | |
|---|---|---|
| Your document added to a shared database | No | Often |
| Results shared with your institution | No | Often (university-owned tools) |
| Re-check later without self-matching | Yes | Not always |
High score? Our academic editors help you fix it properly
A high similarity score does not always mean plagiarism. Often it is a missing quotation mark, a wrong reference format, or a quote that is too long. Our editors and academic writing experts:
- ✓separate real plagiarism risks from correctly cited text
- ✓show you how to quote, paraphrase and reference ethically
- ✓help you fix citations in your required style (APA, MLA, Harvard, Chicago, etc.)
We are not an automatic rephrasing tool. We do not “spin” text to beat plagiarism checkers. We help you fix it the academic way.
Upload any document format
- DOC
- DOCX
- ODT
- PAGES
- RTF
- TXT
- PPTX
- HWP
- HWPX
- Copy and paste
Files up to 100 MB. Slides and presentations are checked too, not only text documents.
Built for everyone who writes, studies or teaches
Students
Thousands of students have checked their work with us since 2011. Check before you submit, so the first plagiarism report you see is your own.
Typical checks: bachelor and diploma theses, master’s theses, thesis chapters (introduction, chapters, conclusions, bibliography), coursework and term papers, essays, homework and assignments, lab work, reports and summaries, internship reports, presentations
Teachers and lecturers
Lecturers, professors and teachers check students’ work quickly and fairly, in the students’ own language and against translated sources.
Typical checks: student essays, coursework, theses, assignments
Solutions for educatorsResearchers and academic authors
Submit to journals and conferences without surprises from publishers’ plagiarism checks.
Typical checks: journal articles and manuscripts, conference abstracts, grant and research proposals, reviews, PhD dissertations, monographs and book chapters
Tutors and freelancers
For people who check many texts, regularly. Unlimited free uploads (fair usage applies) and fast reports for every client.
Typical checks: client texts, edited theses, translations
School pupils
A simple way to make sure school work is original.
Typical checks: assignments and group papers, essays, summaries, final exam papers, projects
Businesses
Legal and marketing teams check content before it goes public.
Typical checks: website copy, articles, legal texts, marketing materials
Universities and schools
Campus-wide licenses for universities and high schools.
Solutions for educatorsHow our plagiarism tool compares
| Feature | Us | Typical checkers |
|---|---|---|
| Free plagiarism score | Yes | Limited / paid |
| 100+ languages | Yes | Mostly English |
| Translated (cross-language) detection | Yes | Rarely |
| Plagiarism risk score (not just %) | Yes | Rarely |
| Paraphrasing score | Yes | Sometimes |
| AI detection score | Yes | Sometimes |
| 80M+ scholarly articles | Yes | Varies |
| Web archive since 2011 | Yes | Varies |
| Your document added to a database | Never | Often |
| Human academic editors available | Yes | No |
Trusted since 2011
Plag made checking my papers fast and worry-free — its clear similarity reports helped me spot unclear citations and fix them before submission. The interface is simple and efficient, so I saved time
Plagramme helped me pass my ITM Frameworks course. It detects revised AI phrases, an advanced feature that makes me feel confident about turning in original work.
Plag really helped me during my thesis, where it was essential to check my work beforehand. Plag pointed out my mistakes and possible similarities, that's why I could hand in my work without worrying.
Plagiarism checker FAQ
Is the plagiarism checker free?
Yes. Every upload gets a free similarity score, plagiarism risk score, cross-language score, AI detection score and citation check. You can upload as many documents as you need under our fair usage rules (up to 10 documents per hour). The full report with highlighted matches, source links and a PDF download is paid.
What is a good similarity score?
There is no single limit: many universities accept 10–20%, and some set their own rules. Look at the plagiarism risk score too. A low percentage concentrated in one place can be riskier than a higher percentage made of short, properly cited quotes. Always check your institution’s requirements.
What is the difference between the similarity score and the plagiarism risk score?
Similarity shows how many words match other sources. Risk shows how likely those matches are real plagiarism, based on how large the matched blocks are.
Can you detect plagiarism in translated text?
Yes. Our cross-language detection finds passages translated from sources in other languages.
Will my document be saved or shared with my university?
No. We do not add documents to a comparison database and we are not owned by any university. We never share your documents with teachers, institutions or third parties.
Will my text match itself if I check it again later?
No. Because your document is not stored in a comparison database, you can re-check drafts and final versions without self-matching.
Which languages are supported?
More than 100, including English, Lithuanian, Latvian, Polish, Spanish, Portuguese, German, French, Ukrainian, Indonesian and Vietnamese. See the full list below.
Which file formats can I upload?
DOC, DOCX, ODT, PAGES, RTF, PDF, TXT, PPTX, HWP and HWPX files up to 100 MB, or you can paste your text.
Does the report detect AI-written text?
Yes. Each check includes an AI detection score.
Do you rewrite my text to lower the score?
No. We are not a rephrasing tool. If you find risks, our academic editors help you cite and paraphrase correctly.
How long does a plagiarism check take?
Usually a few minutes, depending on the length of your document.
Plagiarism detection in 100+ languages
Show all 100+ languages
Submit your work with confidence
Check your document for plagiarism now: free score in minutes, 100+ languages, and your text is never shared.
Trusted by students since 2011. No credit card needed.
