Remove Duplicate Lines
Remove duplicate lines — case-sensitive or insensitive
🔒 Files never leave your browser
0
Input Lines
0
Unique Lines
0
Duplicates Removed
0%
Reduction
Duplicate Details
Paste text to see duplicate details.
How to Use Remove Duplicate Lines
Paste your text
Enter text with one item per line.
Set options
Choose case-sensitive or insensitive, and whether to trim whitespace.
Get unique lines
See deduplicated output with a count of removed duplicates.
Why Choose AllTools Remove Duplicate Lines?
- ✓ 100% free, no account needed
- ✓ Case-sensitive and insensitive modes
- ✓ Trim whitespace option
- ✓ Shows duplicate count
- ✓ Real-time processing
- ✓ No data stored or transmitted
Related Resources
Frequently Asked Questions
How does case-insensitive mode work? ▼
In case-insensitive mode, "Hello" and "hello" are treated as duplicates. The first occurrence is kept.
Does it preserve order? ▼
Yes. The first occurrence of each line is kept in its original position.
Is my data private? ▼
Yes. Everything runs in your browser. No data is sent anywhere.
Is there a file size limit? ▼
No strict limit. Processing happens in your browser, so capacity depends on your device memory. Most files work smoothly.
Which browsers are supported? ▼
All modern browsers including Chrome, Firefox, Safari, Edge, and Opera on both desktop and mobile.
Can I use this offline? ▼
Yes. Once the page is loaded, the tool works without an internet connection since all processing is local.
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