Free Plagiarism Checker for Students: How to Check Before Submitting

You wrote a paper and you're worried it might accidentally match something online. Maybe you paraphrased a source and you're not sure if it's different enough. Here's how to check before your professor does.

How to Check Your Work

Paste your text into the Plagiarism Checker. It analyzes your writing and gives you an originality score from 0-100. Above 80 is good. Below 50 means you need to rework some sections.

What the Score Means

• 90-100: Highly original. Your work is clean.
• 70-89: Mostly original. A few sentences might be too close to common phrasing.
• 50-69: Some concerns. Review the flagged sections and rephrase.
• Below 50: Significant issues. Major rewriting needed.

Common Causes of Accidental Plagiarism

Copying quotes without attribution. If you use someone's exact words, put them in quotes and cite the source.

Paraphrasing too closely. Changing a few words in someone else's sentence isn't enough. You need to express the idea in your own way with your own sentence structure.

Common phrases and definitions. Some phrases are standard enough that matching isn't plagiarism. "The mitochondria is the powerhouse of the cell" is going to match everywhere. That's fine.

Self-plagiarism. Yes, reusing your own previous papers can flag as plagiarism in academic settings.

How to Fix Flagged Sections

Read the original source. Close it. Write the idea in your own words from memory. Compare your version to the original. If they're structurally different, you're good. If they still look similar, try explaining the concept as if you're telling a friend about it. That usually produces naturally different phrasing.