Paste your text, remove duplicates, sort lines — all in your browser, instantly.
What This Tool Does
The Remove Duplicate Lines tool analyzes your text line by line and eliminates redundant entries. It is especially useful for cleaning up email lists, keyword lists, log files, CSV columns, and any other list-based data. Unlike manual editing, this tool processes thousands of lines instantly without any server upload.
Key Features
- Instant deduplication — results appear as you type or click
- Case-sensitive or case-insensitive mode
- Optional whitespace trimming before comparison
- Remove all blank/empty lines in one click
- Alphabetical sort (A–Z) after deduplication
- Live statistics: input count, unique count, duplicates removed
- 100% private — no server upload, no tracking
Common Use Cases
- Cleaning email mailing lists before a campaign
- Deduplicating keyword lists for SEO or PPC
- Removing repeated log entries for analysis
- Cleaning up CSV data before import
- Merging multiple lists and removing overlaps
Frequently Asked Questions
Is my text sent to any server?
No. All processing happens entirely in your browser using JavaScript. Your text never leaves your device.
Does it handle case-sensitive duplicates?
Yes. Toggle the 'Case-sensitive' option. When enabled, 'Apple' and 'apple' are treated as different lines.
What is the maximum text size?
There is no enforced limit. The tool processes text in memory in your browser, so very large inputs may slow down depending on your device.
Can I remove blank lines too?
Yes. Enable the 'Remove blank lines' option to strip all empty lines from the output.