Free Duplicate Line Remover tool

Duplicate Line Remover

DL

Duplicate Line Remover

Smartly remove duplicate lines — case-insensitive, trim spaces, adjacent-only, keep-first/last, sort, preview duplicates & more. Works fully offline.

Input text (paste or type)

Lines: 0

Unique: 0

Removed: 0

Keyboard shortcuts: Ctrl+R remove · Ctrl+Z undo · Ctrl+C copy

Tip: Use Preview Duplicates to inspect duplicates before removing. "Adjacent-only" removes duplicates only when they appear in a row (useful for sorted lists).

Options

Case-insensitive Trim spaces (start/end) before comparing Collapse multiple spaces to single before comparing Ignore empty lines (do not include them) Adjacent-only (only consecutive duplicate lines) Keep last occurrence instead of first Sort result lines (lexicographic) Show preview after operation

Duplicate preview / Frequency

No preview yet. Click "Preview Duplicates" or "Show Frequency".

Advanced

You can use this tool for de-duplicating CSV lines, log files, lists, and more. For huge files (>10 MB), consider doing server-side processing—but this tool handles reasonably large texts quickly in modern browsers.

Done