Line Counter

Count total, empty, non-empty, unique, and duplicate lines in any text in real-time.

0 Total Lines
0 Non-Empty
0 Empty
0 Unique
0 Duplicates

When do you need to count lines?

Line counting is a fundamental operation when working with structured text data. Configuration files, CSV exports, log files, and code all use line-based formats where knowing the number of lines matters for validation, debugging, or compliance.

Use cases

  • Validate that a CSV export has the expected number of rows before importing it into a database.
  • Check a configuration file for duplicate entries that could cause unexpected behavior.
  • Count lines in a log file to estimate how much data to process or archive.

Frequently Asked Questions

What counts as an empty line? expand_more
A line is considered empty if it contains only whitespace characters (spaces, tabs) or nothing at all. Lines with at least one non-whitespace character are counted as non-empty.
How are duplicate lines counted? expand_more
Comparison is case-sensitive and trims leading/trailing whitespace. The duplicate count shows extra occurrences — for example, if a line appears 3 times, it counts as 2 duplicates.