Why this tool is useful
Use this finder to locate repeated claims, accidental copied lines and redundant boilerplate before publishing long-form text.
Text & List Tools · runs locally
Duplicate Sentence Finder
List repeated complete sentences with counts using explicit case-sensitive or case-insensitive comparison.
Ready. Your working data stays in this browser.
How it works
Sentences are normalized only for comparison, counted in discovery order and reported with the first original spelling plus their exact frequency.
Practical example
In ignore-case mode, Same. and same. are reported once as same. — 2, while Other! is omitted because it occurs once.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.