Input
Output
Numbered lines will appear here…
What This Tool Does
Paste any multi-line text and the tool prepends a sequential number to every line, starting from 1 by default. You can choose a custom start number, a separator character (period, colon, parenthesis, or tab), and whether to pad numbers with leading zeros for clean alignment. The output is instant and copy-ready.
When to Use Line Numbers
- Code review: Numbered lines let reviewers reference specific line numbers in feedback comments.
- Script formatting: Screenplay and dialogue formats often require numbered lines for production use.
- Log analysis: Adding line numbers before sharing a log excerpt helps colleagues pinpoint exact entries.
- Study notes: Numbered paragraphs make it easier to refer back to specific points in long documents.