DupliChecker

An online tool that helps users identify and handle plagiarism in their text. Get plagiarism checker free without any limitations. Check plagiarism in assignments, essays, theses, or any other type of document. The basic version lets you scan up to 1,000 words per check without any cost or sign-up, which makes it a solid starter option for short essays or blog posts. Paid plans kick in for bulk checks or higher limits, starting around $10 a month for pros who need more juice. It hits about 95-100% accuracy for obvious copies and paraphrases in tests from 2025 reviews, but it can flag short phrases like 3-5 words as duplicates, leading to some false alarms. Users on Reddit often say to cross-check with something like Grammarly for peace of mind, especially in academia. You can upload docs in .txt, .doc, .docx, .pdf, .odt, and .rtf, or just paste text directly, which keeps things flexible for quick uploads from your device or cloud storage. No fuss with conversions upfront. It does have a built-in AI detector that spots GPT-style writing pretty well, but feedback from Content Hero's 2025 update notes it's weaker on non-GPT models. Probably best as a first pass rather than your only line of defense. They claim 100% privacy by deleting files right after the scan and not storing them, which lines up with user experiences on Trustpilot where folks report no leaks. Still, if you're dealing with super sensitive stuff, maybe anonymize first, just to be extra careful. Free scans cap at 1,000 words each, so for longer pieces like theses, you'll split them up, which can feel a bit tedious. Pro plans bump that to 25,000 words per go, ideal if you're churning out reports regularly.