Plagiarism checker
Check plagiarism before you submit.
Compare your text with available web and academic sources. Review highlighted matches, source links and similarity details before deciding what needs attention.
Inside the report
A similarity score with details behind it.
Matches highlighted in context
Review matching passages where they appear in your document instead of relying only on one overall percentage.
Available sources you can open
Open detected source URLs and compare the wording directly. The report may also show the percentage linked to each source.
A report you can review and share
Move through report details, export the result as a PDF or create a shareable link when those options are available.
Understanding similarity
A match is a finding, not a conclusion.
The similarity percentage summarises how much wording overlaps with detected sources. It helps you locate material that deserves a closer look.
A match may be a quotation, citation, bibliography entry, common phrase, technical wording or text that needs revision. Review the surrounding context before deciding what the match means.
- Billions
- of web pages available for comparison
- Thousands
- of academic publications
- 300M+
- texts checked
How it works
Three steps from text to a similarity report.
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01
Submit your material.
Paste text, upload a supported file or submit a URL. Each file can be up to 24 MB, and a check requires at least 100 characters.
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02
Copyleast checks available sources.
The analysis may compare your text with the public web, academic publications and the internal system database. Private or institutional repositories are included only when separately connected or activated.
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03
Review the matches.
Open highlighted passages, inspect available source links and decide whether each match is quoted, cited, common wording or needs revision.
Who it helps
Built for student writing, useful for careful review.
Students
Review essays and assignments for source overlap before submission and identify passages that need citation or revision.
Graduate students & researchers
Check theses, dissertations, manuscripts and research papers while reviewing every source match in context.
Writers & editors
Inspect source use before publishing, delivering work to a client or sharing a final document.
Review with context
A plagiarism report does not make the decision.
Copyleast identifies similarity and available sources. It does not automatically determine that plagiarism occurred. Review quotations, citations, references and the wider purpose of the text before drawing a conclusion.
Submitted documents are not automatically added to the general comparison database and are not used to train AI models. Documents may remain in an account until the user deletes them. Heavily paraphrased material may not always be detected reliably.
FAQ
Plagiarism checking, explained.
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