Remove Duplicate Lines

This tool removes duplicate lines from text files, keeping only unique lines or the first occurrence of each line. It helps clean up text data by eliminating redundant content.

The tool scans your text line by line, identifies duplicates using exact matching, and removes them based on your selected mode. All processing happens locally in your browser.

Three modes: remove all duplicates (keep first occurrence), remove consecutive duplicates only, or keep only lines that appear exactly once (unique lines).

Yes, when trim is enabled, leading and trailing whitespace is removed from each line before comparison, so "hello" and "hello " are treated as identical.

Yes, 100% safe. All processing happens locally in your browser. Your text never leaves your device and is never uploaded to any server.

Yes, completely free with no hidden costs. No sign-up required, no limits on usage, and no watermarks.

Yes, the tool handles large amounts of text efficiently. However, for extremely large files (100MB+), browser memory limits may apply.

By default, comparison is case-sensitive. "Hello" and "hello" are treated as different lines. This ensures precise duplicate detection.

Yes, you can sort the results alphabetically (A-Z or Z-A) after deduplication to organize your cleaned text.

The tool works with plain text files (.txt), CSV, log files, code files, and any text-based format. Just paste or upload your content.

This tool is specifically designed for text files and operates on entire lines, making it ideal for log files, code, lists, and any line-based text data.

The tool doesn't have an undo feature, but you can easily reload your original text and process it again with different settings.