Most plagiarism tools quietly send your text to a server and a web index.
Plagiarism Checker works the other way: it compares your text only against a source you paste, entirely in your browser.
How to use Plagiarism Checker
- Paste your text in the first box and an optional source in the second.
- Choose the matching phrase length to control how strict the comparison is.
- Review the highlighted passages and the similarity percentage.
Use cases
- Checking a draft against a specific source you already have.
- Comparing two documents for overlapping passages.
- Spotting passages you may have pasted in too closely.
Good to know
Plagiarism Checker measures overlap by finding shared word sequences between your text and the source you paste; a longer phrase length means stricter matching. It has no web access and no corpus, so it only compares against what you provide. With no source pasted, it falls back to flagging passages that repeat inside your own text. Long input is compared up to the first 60,000 characters of each box, with a visible note.
Frequently asked questions
Does it search the web for matches?
No. It has no web access or database and compares only against the source text you paste into the second box.
What does the phrase length setting do?
It sets how many words in a row must match to count, so a longer phrase length reports only longer, stricter overlaps.
What happens if I do not paste a source?
It switches to an internal-repetition check, highlighting passages that repeat within your own text instead of comparing to a source.
Is my text uploaded anywhere?
No. The comparison runs in your browser and nothing is sent to a server.