Copyleast for students
Plagiarism and AI checks, clearly separated.
Check source similarity and review probabilistic AI signals in one place. Copyleast keeps the results separate, so you can understand what each one means before submitting your work.
150 words daily without an account · no card · 70+ languages
The Industrial Revolution did not begin with a single invention. As one historian described it, “the most fundamental transformation of human life in recorded history.” QUOTED Britain’s early advantage reflected access to coal, investment capital and patent protection SOURCE MATCH . It is widely accepted that COMMON PHRASE steam power changed manufacturing, although the speed of change differed across industries REVIEW .
Similarity
18%
4 detected sources
Review each match in context
Source similarity is not an automatic plagiarism verdict. Open the available source and review how the wording is used.
Start a check
Paste text or upload a document.
Add at least 100 characters. Choose plagiarism checking, AI detection or both before the analysis begins.
Two different questions
Similarity and AI signals do not mean the same thing.
Plagiarism checking looks for textual overlap with available sources and helps you review where matching wording appears.
AI detection evaluates writing patterns and returns probabilistic indicators. An AI-related result does not mean source copying, and a source match does not prove that AI was used.
- 300M+
- texts checked
- 70+
- languages supported for text checking
- 10+
- years of checking experience
Two checks, two meanings
One document. Two separate report views.
Run plagiarism checking, AI detection or both. Copyleast keeps each result in its own report view instead of combining unrelated signals into one score.
That separation helps you review source use and AI-associated writing patterns with the context each type of result requires.
Finds similarity to available sources
Estimates AI-associated writing patterns
Shows source links and matched passages
Shows AI probability and Total AI rate
A match must be reviewed in context
A probability must be reviewed in context
Not automatic proof of plagiarism
Not proof of authorship or AI use
How Copyleast works
Three steps from text to a clearer report.
Submit your material, choose the analysis and review the results separately.
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01
Submit your text.
Paste at least 100 characters, upload a supported file, add several files or submit a URL using the available input method.
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02
Choose the analysis.
Run plagiarism checking, AI detection or both. The free allowance is shared between the two analysis types.
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03
Review the report.
Open source matches, inspect highlighted passages and review AI probabilities without treating either result as a final verdict.
The report
Separate results. One place to review them.
Move between plagiarism and AI report views without confusing source similarity with probabilistic AI indicators.
COPYLEAST REPORT
essay-final.docx
Similarity
18%
4 detected sources
Review each match in context
A similarity percentage summarises detected overlap. It does not tell you whether each match is acceptable, cited or problematic. Open the sources before drawing a conclusion.
AI SIGNAL BY SENTENCE
Similarity and AI indicators appear in separate report views. Neither result is a verdict on its own.
Responsible checking
Clear limits make a report more useful.
Copyleast helps identify material that deserves review. It does not automatically decide whether plagiarism occurred or who wrote a text.
- Source similarity is not automatic proof of plagiarism.
- AI probability is not proof of authorship.
- Submitted documents are not used to train AI models.
Use the report together with citations, drafts, assignment rules and the wider writing context.
Who Copyleast is for
Built around student writing, useful beyond the classroom.
Students
Review essays and assignments for source similarity and AI-associated patterns before submission.
Graduate students & researchers
Check theses, dissertations, manuscripts and research writing while keeping source and AI results separate.
Writers & editors
Inspect source overlap and AI signals before sharing or publishing a document.
“Can one percentage tell me whether a text is original?”
No. A score is a summary, not a complete explanation.
- 01A similarity score may include quotations, citations, references and common wording.
- 02AI detection can produce false positives and false negatives.
- 03The writing process, drafts, sources and assignment rules provide context that a detector cannot see.
Copyleast separates source similarity from AI-related indicators and gives you the report details needed for a more careful review.
