Remove Duplicate Lines

Paste a list and instantly remove duplicate lines, keeping the first occurrence of each — useful for cleaning up a merged list, an email export, or a spreadsheet column pasted as text.

Paste text (one item per line)

Result (duplicate lines removed)

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Why use Remove Duplicate Lines?

Merging lists from different sources — two email exports, a combined spreadsheet column, notes from multiple people — almost always introduces duplicates, and finding them by eye in anything beyond a short list is impractical. A line-by-line comparison catches every exact repeat mechanically, which manual scanning reliably misses. This keeps the first occurrence of each unique line and its original position in the list, so the result reads the same as the input minus the repeats — no re-sorting or reformatting applied beyond removing the duplicates themselves.

Key benefits

Instant deduplication, no formula or script needed
Keeps the first occurrence's original formatting
Handles large lists without lag
Free, runs in your browser

Features

Line-by-line duplicate detection
Preserves original line order
Trims surrounding whitespace before comparing

Popular use cases

Merging two email lists and removing repeats before a send
Cleaning up a spreadsheet column pasted as plain text
Deduplicating a list of URLs, tags, or keywords
Removing repeated entries from combined meeting notes or logs

How to use Remove Duplicate Lines

1
Paste your list
One item per line.
2
Read the result
Duplicate lines removed automatically, first occurrence kept.
3
Copy the cleaned list
Ready to paste.

Frequently asked questions

Which occurrence does it keep when there's a duplicate?

The first one — later occurrences of an identical line are removed, while the original order of the remaining unique lines is preserved.

Does it ignore extra spaces when comparing lines?

Yes — each line is trimmed of leading/trailing whitespace before comparison, so " apple" and "apple" are correctly treated as duplicates.

Is comparison case-sensitive?

Yes — "Apple" and "apple" are treated as different lines, since case often carries meaning (like proper nouns) that shouldn't be silently merged.

Last reviewed: September 2026

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