Plagiarisma is a free online plagiarism checker with a set of AI writing tools attached. The checker scans pasted text, an uploaded file (PDF, DOCX, RTF, TXT, HTML, PPTX and other formats) or a URL against web sources, books and academic papers using Google or DuckDuckGo search, and supports 190+ languages. It is a web service from Plagiarisma Ltd. of London, with a Chrome extension, a Microsoft Edge add-on, an Android app and a Google Workspace add-on, and the site also lists a Firefox extension, a Moodle plugin and Windows desktop software.
Three AI tools are linked from the same site. The AI Content Detector says it analyses linguistic patterns, structural signals and semantic indicators to flag machine-written text. The AI Paraphrasing Tool, billed as a free Quillbot alternative, rewrites text for flow while keeping its meaning. The AI Essay Writer generates essays, articles and research papers from a prompt. The pages name no model and give no accuracy figures or per-check limits, and the detector’s claim to be highly accurate is unsupported on the page. Detectors of this kind are probabilistic and can misjudge human writing, so a score is not proof of authorship. The plagiarism check itself works by matching text against web search results rather than by an AI model.
The site says everything is free and positions itself as a free Turnitin alternative; the pages reviewed show no paid plan, and a free account is offered through Get Free Access. Read the privacy policy before submitting unpublished work. The essay writer and paraphraser can be used to pass off other people’s work as one’s own, so check your institution’s academic-integrity rules before using them for graded work.
