Why this tool is useful
Use sentence numbering to prepare requirements, review comments, lesson prompts or ordered talking points from ordinary prose.
Text & List Tools · runs locally
Number Text Sentences
Put each detected sentence on its own numbered line with a configurable starting value and three readable marker styles.
Ready. Your working data stays in this browser.
How it works
Visible terminal punctuation defines sentence units, then the selected marker is prefixed without rewriting the sentence content.
Practical example
Starting at 3 changes One. Two! into rows 3. One. and 4. Two!.
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.