Remove Duplicate Lines Online
Quickly remove duplicate lines from lists, text files, or data. Keep unique rows, extract duplicates, count line occurrences, and clean up whitespace. Fast, secure, and client-side.
Original Text 0 lines
Deduplicated Result 0 lines
Remove Duplicate Lines from Text & Lists
The Remove Duplicate Lines tool is designed for web developers, data analysts, marketers, and writers who need to clean up repeated entries. Easily de-duplicate email subscriber lists, server logs, CSV identifiers, keyword targets, or code arrays.
Deduplication Modes:
- Keep First Occurrence: Preserves the initial instance of every line and drops subsequent repeats. Recommended for maintaining original chronological sequence.
- Keep Last Occurrence: Keeps the latest instance of repeated lines while removing earlier occurrences. Useful when newer entries take precedence.
- Keep Only Unique Lines: Completely strips out any line that appears more than once, leaving only items that were never repeated.
- Show Duplicates Only: Extracts only repeated lines to quickly identify overlaps and errors in data.
Key Features:
- Case Insensitive Matching: Treats "Apple", "apple", and "APPLE" as identical.
- Trim Whitespace: Cleans up invisible leading/trailing tabs and spaces before comparing.
- Count Occurrences: Prefixes each unique line with its frequency (e.g.
[3x] item). - Integrated Sorting: Sort results alphabetically (A→Z or Z→A) or keep original order.
Related Text Tools
- Sort Text Lines — sort lists alphabetically, naturally, or by length.
- Extract Column — isolate specific columns from CSV or tabular lists before deduplicating.
- Clean Whitespace — strip tabs, spaces, and formatting discrepancies.
- Remove Empty Lines — eliminate blank lines from your lists.
- Compare Text (Diff Checker) — compare lists side-by-side to inspect removed duplicates.
- Character Counter — count characters, words, sentences, and lines in real time.
- Add Text to GIF — add animated text overlays and subtitles to GIFs and videos.