What is Line Counter?

The Line Counter instantly counts lines in your text, including total lines, non-empty lines, blank lines, and lines containing specific patterns. Useful for code analysis, log file inspection, and document statistics.

Beyond a simple total, the counter splits your text into non-empty, blank, and pattern-matched lines, calculates the average length in characters, and flags the longest line with its line number. Useful when reviewing log dumps, gauging if a function file has grown past your refactor threshold, or trimming whitespace from pasted spreadsheet rows.

How to use

1. Paste your text or upload a text file into the input area.
2. View instant statistics: total lines, non-empty lines, blank lines, and average line length.
3. Optionally filter by a search pattern to count only matching lines, or copy the statistics summary.

When to use

• Checking if a source file has crossed your team's max-line-count rule before a code review.
• Counting how many lines in a log file match a substring like ERROR or 500.
• Estimating the size of a paste from a spreadsheet before importing it into a script.

Result

You paste a 500-line Python script to check its structure. The counter shows 500 total lines, 387 non-empty, 113 blank lines, average length of 34 characters, and the longest line is 119 characters — helping you decide whether to refactor.

FAQ

Does a trailing newline at the end of the text count as an extra line?

No. A final newline is treated as the terminator of the last line, not the start of a new empty one. If you paste content with a trailing newline, the count matches what your editor's status bar shows.

How does the filter pattern work — is it a regex or plain text?

It's a plain substring match, case-sensitive. Type ERROR to count lines containing that exact word. For regex-level filtering, paste the result into a different tool that supports patterns.

What does 'blank line' mean exactly?

A line is blank if it contains zero characters or only whitespace (spaces, tabs). Lines with invisible characters like zero-width spaces count as non-empty, so check those if your numbers feel off.

Can I count lines in a large file without uploading it anywhere?

Yes. The file is read locally in your device memory, never sent over the network. Tested cleanly with files up to several megabytes; very large logs may take a moment to recalculate.

Why is the average line length a decimal?

It's the total character count divided by the number of non-empty lines, rounded to one decimal. Useful for spotting wrap issues — anything well above 100 usually means lines that should be split.

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