Remove Duplicate Lines
Strip duplicate lines from any list in one click — perfect for cleaning email exports, SKUs and CSV rows.
What is Remove Duplicate Lines?
You exported a list from your CRM and there are duplicates everywhere. Excel can do it but you don't want to fire it up for a quick clean.
Paste your list and get only unique lines back instantly.
If you're cleaning email lists, you avoid double-emailing the same subscriber. If you're processing SKU exports, you remove inventory double-counts. If you're prepping a survey participant list, you make sure no one gets contacted twice.
How to use Remove Duplicate Lines
Four steps. No setup, no signup.
Step 1
Paste your list, one item per line
Step 2
Toggle case sensitivity if needed
Step 3
See the deduplicated list instantly
Step 4
Hit Copy and paste back into your CRM or sheet
Example
A messy email list becomes a unique one.
Input
alice@x.com bob@x.com alice@x.com carol@x.com bob@x.com
Output
alice@x.com bob@x.com carol@x.com
Why Remove Duplicate Lines is useful
- ✓
Dedupe email lists, slugs, SKUs or any line-based list in one click.
- ✓
Keeps original order — first occurrence wins.
- ✓
Toggle case sensitivity for emails or codes.
- ✓
Works on tens of thousands of lines without slowing your tab.
Common questions
Which duplicate gets kept?
The first occurrence stays, later duplicates get dropped. Original order is preserved.
Tip: Reverse the list first if you need the last occurrence kept.
Is it case-sensitive?
You can toggle it. Off means 'Apple' and 'apple' count as duplicates.
Tip: Use case-insensitive for email lists.
What about whitespace differences?
'Apple ' and 'Apple' count as different lines because of trailing space.
Tip: Run Remove Extra Spaces first for cleanest results.
Does it sort the output?
No, dedupe preserves original order. Use Sort A-Z separately if you need sorting.
Tip: Combine the two for fully cleaned lists.
Last reviewed: April 2026 · Free, browser-based, no signup.
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