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Free Plagiarism Checker for Students

Paste your essay, upload a file, or type your text. Our tool scans billions of sources— journals, websites, books, and past submissions — and returns results in seconds.

100% Free forever No login needed Instant results Text stays private

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Supports .docx, .pdf, .txt, .rtf · Max 10 MB

Plagiarism

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1b+

Web pages & sources scanned

1.4M+

Students use our tool monthly

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Average result time per check

4.9/5

Student rating from 5000+ reviews

Advantages Of Plagiarism Checker

Why students trust our tool

Our plagiarism checker is built specifically for assignment submissions — not generic content marketing use cases.

Deep Academic Source Coverage

Cross-referenced against peer-reviewed journals (PubMed, JSTOR, IEEE Xplore), university repositories, open-access databases, and over 10 billion indexed web pages — the same sources your professor checks against.

Instant Results in Under 5 Seconds

No waiting in a queue. No email confirmation required. Results load directly on the page so you can review, revise, and re-check before your submission deadline.

100% Private & Secure

Your text is never stored, indexed, or added to any database. We process each check in a sandboxed environment and delete it immediately after. Your assignment stays yours.

No Registration, No Limits

Completely free, no account required. Run as many checks as you need with no daily cap or word limit restrictions. Just paste and go.

Detailed Source Breakdown

Don't just get a score — see exactly which phrases matched which sources. Each result shows the URL, similarity percentage, and a highlighted excerpt so you know precisely what to rewrite.

AI-Similarity Detection Included

Beyond traditional plagiarism, our tool flags AI-generated patterns consistent with ChatGPT, Gemini, and other LLM outputs — so you can spot and rewrite AI-assisted sections before submission.

How Does Plagiarism Checker Work

Four steps from paste to results

Behind the scenes, our engine runs a multi-pass comparison across academic, commercial, and archived sources simultaneously.

Submit Your Text

Paste up to 25,000 words directly or upload a .docx, .pdf, or .txt file. We accept any academic format instantly.

Deep Source Scanning

Our engine breaks your text into n-gram fingerprints and queries 10 billion+ pages across journals, open-web, and academic repositories simultaneously.

Similarity Scoring

Each matched passage is scored by similarity percentage and source authority. Properly cited quotes are distinguished from unattributed copies.

Full Report Delivered

A colour-coded report highlights every matched section with a direct source link. Print, download, or copy your detailed results.

Supported Formats

Works with any file format

Upload directly or paste text. We handle every format your university accepts.

.DOCX

Microsoft Word

.PDF

PDF Documents

.TXT

Plain Text

.RTF

Rich Text Format

.ODT

OpenDocument

TEXT

Direct Paste

What Students Say

Trusted by 5000+ students

Real reviews from students who use our plagiarism checker before every submission.

Caught a paraphrased paragraph that matched a 2019 journal article. I had no idea it would flag something that subtle — genuinely saved me from a plagiarism violation.

Jasmine S.

Nursing · University of Sydney

Verified

I run every MBA assignment through this before submitting. It's faster than Turnitin and the source breakdown is way more useful. Shows exactly which sentence matched and where from.

Rohan K.

MBA · Melbourne Business School

Verified

Other free tools gave vague results. This one showed me three specific sources my law essay accidentally mirrored — two were journal articles I hadn't even cited. Really thorough.

Amelia T.

LLB · University of Cambridge

Verified

As an international student, I always worry about accidentally copying phrases from my reading notes. This tool flags those instances before my tutor does — it's been a lifesaver.

Li W.

Engineering · RMIT University

Verified

My dissertation had a 3% similarity score here before I submitted. Turnitin came back at 4%. Extremely close match — so this tool genuinely reflects what universities see.

Diana M.

PhD Education · University of Oxford

Verified

I use this every week before submitting CS assignments. It also spotted that a GitHub code snippet I used without attribution would've flagged. Clean interface, fast, no spam.

Ben N.

CS · Stanford University

Verified

How We Compare

Us vs other checkers

See why students choose our free tool over paid alternatives.

Feature	AHP Checker ✦	Grammarly	Turnitin
100% Free
No sign-up required
Academic journal coverage
Source URL shown in report
AI-generated content detection
Text stored after check	Never stored	May be stored	Stored in DB
Unlimited daily checks

Frequently Asked Questions

Your questions, answered

Everything students ask us about our plagiarism checker — answered clearly and honestly.

Q01 Is this plagiarism checker really free?

Yes — 100% free with no hidden plans, no credit card, and no premium upsell required to see your results. You get the full similarity report, source breakdown, and AI-detection flag for every check at no cost. We offer it free because we want students to submit with confidence, and those who need further writing help can explore our expert services separately.

Q02 Will my text be saved or added to a database?

No. Your text is processed in an isolated environment and permanently deleted as soon as the check completes. We do not store it, index it, or share it with any third party. Unlike Turnitin, which adds student submissions to its global database (meaning other students' work can be compared against yours), our checker is purely one-directional — scan only, store nothing.

Q03 What similarity percentage is acceptable for university submissions?

Most universities consider under 10–15% similarity acceptable, though this varies significantly by institution, department, and assignment type. Dissertations often allow up to 15–20% since they include extensive bibliographies and standard methodology language. Our tool flags anything over 15% as a warning and anything over 25% as high-risk, giving you context alongside the raw score. Always check your university's specific academic integrity policy.

Q04 Does the tool detect paraphrased plagiarism?

Yes. Our engine uses semantic fingerprinting rather than exact-string matching, which means it detects closely paraphrased passages even when individual words have been swapped. This is the same challenge students face with modern detection tools — changing "the study found" to "research indicated" won't fool the checker. If the underlying idea and structure closely mirror a source, it will be flagged with a reduced but still visible similarity score.

Q05 Can I check a PDF or Word document directly?

Yes. Use the "Upload File" tab to upload .docx, .pdf, .txt, or .rtf files up to 10 MB. Our parser extracts the text content while ignoring formatting, headers, and bibliography sections. If your file is scanned (image-based PDF), our OCR layer will attempt to extract the text, though accuracy depends on scan quality. For best results with scanned documents, paste the text manually.

Q06 How accurate is the plagiarism checker compared to Turnitin?

Our tool consistently returns similarity scores within 2–5% of Turnitin results for the same documents (based on feedback from thousands of students who check both). The main difference is that Turnitin also compares against its proprietary student submission database, which we cannot access. This means our score may be slightly lower if matches only exist within Turnitin's private database — which is why we recommend treating our result as a floor estimate, not a ceiling.

Q07 Does the checker work for non-English languages?

Our checker currently optimises for English-language academic content and achieves the highest accuracy for English text. It does have basic detection capability for Spanish, French, German, and Mandarin, but source coverage and semantic accuracy are lower for non-English documents. For non-English academic submissions, we recommend additionally using language-specific tools alongside ours.

Q08 My similarity score is high — what should I do?

First, check which sources triggered the match — if they're all properly cited quotations, your score may be artificially high and acceptable. If unattributed or paraphrased content is flagged, you have three options: (1) add proper in-text citations, (2) rewrite the section in your own words, or (3) remove the passage entirely. If you need help rewriting or structuring your assignment with proper citations, our PhD-qualified academic writing experts can assist — typically within a few hours.

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