Detect duplicate content — sentence-level similarity with source attribution
0 characters
Analyzing text for duplicate content...
Initializing...
0%
Similarity
Sentences checked0
Matches found0
High similarity matches0
Check completed-
✓
No significant matches found
Your text appears to be original. No passages matched our similarity threshold.
Privacy-first: This tool uses client-side sentence similarity algorithms. For web source matching, sentences are sent to a search API only when you explicitly enable "Check against web sources" (coming soon). No full documents are uploaded.
How It Works
Sentence splitting: Your text is split into individual sentences
Fingerprinting: Each sentence is converted to a normalized fingerprint (lowercase, punctuation removed)
Local comparison: Client-side similarity algorithms (Jaccard, Cosine) compare against a local index of common phrases
Web search (optional): High-risk sentences can be checked against live search results via API
Scoring: Each sentence gets a similarity score; overall score is weighted average
Reporting: Matches are highlighted with source URLs and similarity percentages