Plagiarism
September 14, 2026
Plagiarism
September 14, 2026
Review
August 3, 2026
Review
June 29, 2026
Review
June 29, 2026
Plagiarism
April 20, 2026
Review
February 13, 2026
AI Detection
February 12, 2026
Minimum 50 words required
Check up to 700 words free, with or without an account. Paste your text or upload a file in any format.
Check essays, assignments and research papers against web pages, academic journals and previously submitted papers before you hand them in. Every matched passage is highlighted with the source it came from, so you can add a citation, quote it properly or rewrite it in your own words. Free checks cover up to 700 words, with or without an account.
Drop in your essay, paper, or draft as text or a file. No formatting cleanup needed.
Our engine cross-checks your text against billions of web pages, journals, and previously submitted academic papers.
See a clear originality score, matched passages highlighted sentence by sentence, and the exact sources they came from.
Export a clean PDF report you can submit, save, or forward to a teacher or supervisor.
Over 934K scans completed for 59K+ students, writers and educators worldwide.
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Our detection engine flags even paraphrased similarities.
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Suitable for journal, thesis, and coursework submissions.
See exactly how Skyline Academic scans, analyzes, and highlights similarities
across billions of academic sources
Take a sneak peek at our plagiarism reports below
| Tool | Built for | Access without an institution | Plagiarism source-matching | Pricing | Languages | Report |
|---|---|---|---|---|---|---|
| Skyline Academic | Individual students and teachers | Yes | Yes | Free up to 700 words; pay per scan from $5.99 | 20+ | Exportable PDF with matched sources |
| Turnitin | Institutions | No | Yes | Institutional licence only | Varies by plan | Institutional dashboard |
| GPTZero | Individual writers | Yes | Yes, free up to 10,000 words/month | Free and paid plans | English-focused | On-screen |
| Originality.ai | Publishers and agencies | Yes (paid) | Yes (paid) | Subscription or credits | English-focused | Dashboard |
| Copyleaks | Businesses and institutions | Yes (paid) | Yes | Subscription | Multiple | Dashboard |
| QuillBot | Individual writers | Yes (paid) | Yes, with Premium (25,000 words/month) | Free and Premium plans | English-focused | On-screen |
Last checked October 2026 from each company's own pages. Features and limits change, so confirm before you rely on them.
Detects verbatim and paraphrased plagiarism.
Combines AI detection with plagiarism analysis.
Academic journals, web, and institutional repositories.
Reports delivered in minutes.
Easy-to-read, university-ready PDF summaries.
Check up to 700 words free, with or without an account. Pay per scan for longer documents, no subscription.
*Prices are per check, not a subscription
*Prices are per check, not a subscription
*Prices are per check, not a subscription
Plagiarism is more than copying a paragraph word for word. Universities also treat each of these as serious problems.
Mixing copied phrases into your own sentences.
Rewording a source so closely that it still follows the original, without a citation.
Reusing your own earlier work without permission.
Copying that comes from a forgotten citation.
Our checker highlights both exact matches and paraphrased similarities, so you can spot each of these before you submit. For a full breakdown with examples, read our guide to the types of plagiarism.
Your report shows a similarity score and every matched passage with its source. A match is not automatically plagiarism: correctly quoted and cited text, common phrases and reference lists can all show up as matches.
As Smith (2021) notes, “climate policy works best when it is designed locally.” Cities that set their own targets tend to cut emissions faster than national programmes do, which suggests that local action deserves more funding.
On the other hand, national rules still matter for setting minimum standards.
Smith, J. (2021). Local climate policy.
Work through each highlighted passage
If it is a quote
Check it has quotation marks and a citation.
If it is a paraphrase that follows the source too closely
Rewrite it in your own words and cite the source.
If it is a common phrase or a reference
Common phrases and reference list entries can show up as matches. They are not plagiarism on their own.
Submitting through Turnitin? Our guide to the Turnitin similarity score explains how instructors read that report.
A plagiarism checker looks for text that matches existing sources. An AI detector estimates whether text was written by a tool such as ChatGPT.
| Compare | Plagiarism checker | AI detector |
|---|---|---|
| What it checks | Whether your text matches existing sources: web pages, academic journals and previously submitted papers | Whether your text was likely written by a tool such as ChatGPT |
| What you see | A similarity score, with every matched passage and its source | Sentence-level highlights of text that reads as AI-generated |
| What it can miss | Original AI-generated text, because it does not match an existing source | Human writing that copies a source without attribution |
| Use it to | Add missing citations, fix quotes and rewrite close paraphrases | Check whether your writing reads as AI-generated before you submit |
| On Skyline | Free up to 700 words, right here on this page | Free up to 700 words with our AI detector for essays |
Because each check can miss what the other finds, many instructors now use both. You can run either check on its own, or use a paid scan that covers both in one report.
Collaborate with Skyline Academic to provide integrity-driven solutions for your institution or organization, including a free plagiarism checker for students. Our tools help maintain academic honesty, streamline assignment verification, and ensure every student submits original work.
A one-stop platform empowering educators to evaluate originality, detect AI-generated writing, and maintain academic standards.
Get 1-on-1 help from subject tutors when you need more than a report: understanding your sources, citing correctly and improving your academic writing.
Check whether your writing reads as AI-generated, with sentence-level highlights and 98.7% precision in our internal testing.
Unlock your academic potential with our tailored guidance, expert assignment support, and comprehensive grading services
Yes. You can check up to 700 words for free, with or without an account. For longer documents, pay-per-scan options start at $5.99 with no subscription.
No. You can paste or upload up to 700 words and run a free check without creating an account. You only need an account to buy a paid scan for a longer document.
It compares your text against billions of web pages, academic journals and previously submitted academic papers. Every matched passage is highlighted and linked to the source it came from.
Yes. The checker flags paraphrased similarities as well as word-for-word matches, so reworded passages that still follow a source closely are shown in your report.
The similarity score shows how much of your text matches other sources. A match is not automatically plagiarism, because correctly quoted and cited passages also count, so review each highlighted passage and its source.
There is no single acceptable percentage, because each university and instructor sets their own rules. What matters most is that every match is either your own original wording or a properly quoted and cited source.
You can upload documents in any file format or paste your text directly. Each check needs at least 50 words, and free checks cover up to 700 words.
Yes. Paid scans can show plagiarism and AI detection results together in one report. For an AI check on its own, use our free AI detector.
A scan costs $5.99 for up to 3,500 words, $12.99 for 3,501 to 15,000 words and $19.00 for longer documents. Prices are per check, not a subscription.
Yes. Your documents are never sold, shared or used to train our detection models.
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