Duplicate Content Checker
Check for similarity between two texts using advanced string comparison algorithms.
The Duplicate Content Checker compares two texts and returns a similarity score in percent. It uses the Levenshtein algorithm and finds matching segments of three or more consecutive words. Everything runs in your browser.
How it works
- Paste the first text into the left field and the second text into the right field.
- Click "Check for Duplicates".
- Read the similarity score and review the list of matching text segments.
When to check for duplicate content
Texts with 80% similarity or more are flagged as potential duplicate content. This is common with product descriptions in e-commerce where variants differ by only a few words. Translations and content migrations also benefit from a comparison before publishing.
Besides the percentage, the tool lists the exact passages that appear in both texts. That tells you where the overlap sits.
FAQ
How is the similarity calculated?
The tool uses Levenshtein distance. It measures how many insertions, deletions and substitutions are needed to turn one text into the other. Fewer changes mean a higher similarity score.
At what score should I worry?
Above 80% the tool flags it as potential duplicate content. Between 50% and 80% you have partially overlapping content. Below 20% the texts are largely unique.
Is my text stored anywhere?
No. The comparison runs locally in your browser. Nothing is uploaded or saved.