Plagiarism checker for teachers

plagiarism.ink lets you check a student's paper for passages copied from the web. You paste the text, press the check button, and get a list of the passages that appear on other pages, each with a link to the matching page. The free check needs no account.

Checking a paper

Copy the student's text from the document or the submission system.
Paste it into the box on the home page and press the check button.
Open each flagged passage and compare it with the page it matched.

Premium subscribers can upload a Word document directly, have quoted text skipped, search more passages per paper and print a report to keep with the assignment. See plans and pricing.

When there is a match

Look at the quotation marks and citations first. Cited quotes will always match their source.
Check the length. A short phrase can match by chance. A full sentence or paragraph in identical wording is much harder to explain.
Look at the source. A match on a study-notes site or essay bank is more telling than a match on a dictionary page.
Talk to the student. Ask them to explain the passage in their own words. A checker report is a reason to ask, not proof.

Limits to keep in mind

The checker searches the public web. It will not find a paper copied from another student unless that paper is online, and it will not catch careful paraphrasing. Read how plagiarism checkers work for more on what a report can and cannot show.