A plagiarism checker is a program that examines a given work against other works available and found to determine similarities. By scanning across a preset database of works—including books, journals, publications, various online content, articles, and more—it can determine if a work is plagiarized or unoriginal.
How it Works:
The person submits the writing.
The checker compares the found writing to what's online and in its database.
A report is generated, showing what's matched, the percentage of plagiarism, and where it was sourced.
Some checkers include suggestions for proper citation to eliminate finding of plagiarism.
Popular Plagiarism Checkers:
Turnitin (used for educational settings)
Grammarly Plagiarism Checker
Copyscape (often used for blogging/web content)
Quetext
Plagscan
Plagiarism checkers are commonly used by students, educators, businesses, and freelance writers to ensure protection from accidental attribution.