What counts as whitespace?

Spaces and tab characters at the very beginning or end of each line. Whitespace inside the line is never touched.

What is the difference between the trim modes?

"Both Sides" removes spaces and tabs from both ends of each line. "Leading Only" removes them only from the start of the line. "Trailing Only" removes them only from the end.

Does this affect blank lines?

By default blank lines (or lines that become blank after trimming) are kept as empty lines. Enable "Remove blank lines after trim" to drop them entirely.

Is my text sent to a server?

No. All processing happens inside your browser using JavaScript. Nothing is uploaded anywhere.

How many lines can it handle?

The tool is purely client-side and can handle thousands of lines without any server round-trip.

Line Trimmer

Paste any text, choose trim mode (both sides, leading only, or trailing only), and get clean lines instantly.

Input Text

Trim Mode

Both Sides Remove leading and trailing whitespace

Leading Only Remove only leading (left-side) whitespace

Trailing Only Remove only trailing (right-side) whitespace

Remove blank lines after trim Drop lines that are empty once trimmed

Result

Paste text on the left and click Trim Lines to begin.

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Summary

Line Trimmer removes leading and/or trailing whitespace from every line in a block of text. Choose to trim both sides, leading only, or trailing only, with an optional blank-line filter.

How it works

JavaScript splits the input on newlines, applies the selected trim mode to each line using string methods, optionally filters blank results, then rejoins and displays the output — no server involved.

Use cases

Clean up copy-pasted code that has inconsistent indentation.
Strip trailing spaces from CSV or TSV data before import.
Normalize log file entries with irregular leading whitespace.
Prepare text for comparison by removing edge whitespace from each line.

Frequently Asked Questions

Last updated: 2026-05-23 · Reviewed by Nham Vu