Duplicate Line Remover

How It Works

Paste your text with one item per line. The tool compares each line against all previous lines and removes exact duplicates, keeping only the first occurrence. Whitespace is trimmed before comparison.

Common Use Cases

• Deduplicating email lists before sending campaigns
• Cleaning up keyword lists from SEO tools
• Removing duplicate entries from CSV columns
• Cleaning log files and error outputs
• Merging multiple lists into a unique set
• Deduplicating import/require statements in code

Other Line Operations

This tool also supports sorting, removing empty lines, reversing order, adding prefixes/suffixes, and more. Use the operation buttons above the input field to switch modes.