IMPORTANT NOTE: Plagiarism checkers are not perfect…even the services that charge a fee. Many of the free services have some inherent issues that might prevent complete accuracy. Some sites search only certain portions of the Internet, while others might search only professional materials.
The SMHS Library recommends using several plagiarism checkers for the same paper as a means of increasing your chances that any issues will be discovered before you turn in your work. It is, of course, the responsibility of the writer to avoid plagiarism at all costs. If you aren’t sure how to include in-text quotes or paraphrasing of others’ work that clearly identifies your source, please see your teacher or librarian. They can help you avoid those plagiarism pitfalls.
The following sites can be helpful in this process, but are not a guarantee that your work is plagiarism free. They just provide a good place to start.
Remember: ALWAYS CITE YOUR SOURCES and be certain that you are following the required citation style rules when quoting or paraphrasing a source in-text.
Plagiarism Checker: Copy and paste your text into the provided window and instantly discover whether you’ve inadvertently copied someone’s internet-based work. It will even check your spelling for you at the same time. You are limited to 1,000 words at a time, but it’s still an effective tool and completely free. It only searches the internet.
DupliChecker: This site is free, also limited to 1,000 words at a time, and searches only the internet. This site does require registration if you want to upload more than 1,000 words a day, but in addition to the plagiarism checker, it has numerous other tools including a paraphrasing tool and a reverse image search that can help you correctly identify the real owner of images you have found on the internet.
PlagiarismDetector: Like the previous two sites, this site is also free, limited to 1,000 words at a time, searches the internet. No sign in is necessary.