Remove Duplicate Lines
Dedupe a list of lines — case-sensitive or trimmed options.
See how it works
Watch a quick simulation of this tool in action — no file needed.
How to use Remove Duplicate Lines
Follow these steps — everything happens instantly in your browser.
- 1
Step 1. Paste your lines into the input area.
- 2
Step 2. Toggle case-sensitive matching if you need to treat “Apple” and “apple” as different.
- 3
Step 3. Toggle trim whitespace to ignore leading/trailing spaces when comparing.
- 4
Step 4. Review the unique output, the removed count and the unique count, then copy.
Why use this tool
Private by design
All processing happens locally in your browser. Open DevTools → Network and you'll see zero file uploads. Ever.
Instant
No upload wait, no queue, no server round-trip. Results appear the moment you drop a file.
Free & unlimited
No accounts, no watermarks, no daily caps. Use it as many times as you like, forever.
Works everywhere
Desktop, tablet or phone — every tool is responsive and installable as a PWA for offline use.
Frequently asked questions
Everything you might want to know about remove duplicate lines.
Sort Lines
Alphabetize, sort by length, shuffle or reverse any list.
Find & Replace
Replace text with optional regex & case-sensitive matching.
Word Counter
Live word, character, sentence & reading-time stats — private.
Text Diff
Compare two texts line-by-line — added/removed highlighted.