Your Best Plagiarism Checker Tool — Fast, Simple, Accurate.
Welcome to PlagiaGuard — your trusted tool to check if any student submission matches an original essay.
Paste the original source essay on the left, and the student’s suspected or flagged essay on the right.
Once both are entered, click the Compare button below to instantly check for possible plagiarism.
Results will highlight a similarity score and common words detected to help you take the next step with confidence.
Word Count:
Word Count:
%
This tool checks how much of the student’s essay matches the original source.
It removes basic grammar words like “the,” “is,” “in,” etc., and focuses only on the important words.
Then it compares both essays to find the matching words.
The similarity score is calculated by dividing the number of matching important words by the total important words in the original essay.
The higher the score, the more similar the two essays are.
To calculate the Similarity Score, The formula we use is:
(number of matching important words) ÷ (total number of important words in the original essay) × 100
Example:
10 important words in the original essay
6 of them are also in the student’s essay
Similarity score = (6 ÷ 10) × 100 = 60%
What the Score Means
80–100% → High Similarity (likely copied)
40–79% → Medium Similarity (some parts reused)
0–39% → Low Similarity (mostly original)