Duplicate Line Remover
Clean lists and logs by deleting repeated lines. Optionally ignore case so Apple and apple are treated as the same line.
Introduction
Duplicate Line Remover is a free, browser-based utility in our Text Tools collection. Clean lists and logs by deleting repeated lines. Optionally ignore case so Apple and apple are treated as the same line. Drop repeated lines from lists, CSV columns, and log snippets while keeping the first occurrence. Optional case-insensitive compare treats Apple and apple as the same line. Everything runs locally in your browser — inputs stay on your device, with no account or upload required. Highlights include keep first occurrence of each line.
Features
- Keep first occurrence of each line
- Optional case-insensitive matching
- Shows how many duplicates were removed
- One-click copy
How to use
- 1Paste text with one item per line.
- 2Toggle case-insensitive matching if needed.
- 3Copy the deduplicated output.
Example
Remove repeats
Inputapple banana appleOutput
apple banana
Benefits
- Run Dedupe Lines entirely in the browser with no signup or installation.
- Keep sensitive sample data private — processing never leaves your device.
- Keep first occurrence of each line
- Optional case-insensitive matching
- Shows how many duplicates were removed
- Pair it with Line Sorter and Whitespace Remover when your workflow needs adjacent utilities.
FAQs
Yes. The first time a line appears is kept; later repeats are dropped.
Yes. Multiple empty lines collapse to a single empty line if they repeat consecutively after the first blank.
No. Deduplication runs entirely in your browser.
Yes. Dedupe Lines on EverydayDevTools is free, with no account, watermarks, or usage caps for normal interactive use.
No. Dedupe Lines runs in your browser. Your input is processed locally and is not sent to EverydayDevTools servers.
Clean lists and logs by deleting repeated lines. Optionally ignore case so Apple and apple are treated as the same line. It fits everyday text tools tasks when you want a fast local utility instead of installing a CLI or opening a heavy IDE feature.
Core capabilities include: Keep first occurrence of each line; Optional case-insensitive matching; Shows how many duplicates were removed; One-click copy.
Developers often pair Dedupe Lines with Line Sorter, Whitespace Remover, Word Counter. Open Related tools on this page for quick links.