What is Plagiarism Checker?
Plagiarism Checker is a free online originality checker that finds repeated passages inside your text and compares it with reference text or source URLs you provide. It shows an originality percentage, the matching parts and rewrite tips — no third-party API.
Check plagiarism online with evidence-based shingle similarity — no Copyscape-style third-party APIs. Compare drafts to your own sources and get originality feedback on Fah Swe Tools.
Key features
- Originality score with matching passages
- Compare against your own source text or URLs
- Detects internal duplicate sentences
- Free, no signup; text is not stored
Popular uses
- Check essays and assignments against sources
- Make sure blog posts are not copied from references
- Find duplicate paragraphs in long articles
Also known as: Originality Checker, Duplicate Content Checker, Copy Checker.
How it works
- Paste your article or essay text (80+ characters).
- Optionally paste reference text or source URLs to compare.
- Review originality %, matches, and rewrite feedback.
FAQ
Is the score real?
Yes — computed from text shingles and optional URL comparisons you provide. Not a random toy percentage.
Any third-party API?
No. We only fetch URLs you paste (SSRF-safe). No Google/Copyscape/search APIs.
Does it search the whole internet?
No. It compares your text with the sources you provide and checks internal repetition — it is not a web-wide database like Turnitin.
How many words can I check?
Paste at least 80 characters; long articles are supported within page limits.