Remove Duplicate Lines Online — Clean Lists Fast

You exported a mailing list, scraped a column of SKUs, or merged two notes — and now the same line appears three times. Sorting in a spreadsheet works, but for a quick paste cleanup, a line deduper is faster.

Remove Duplicate Lines keeps the first occurrence of each line and drops the rest. Options:

• Case-sensitive — Apple and apple stay distinct when on; merge when off
• Preserve order — keep original sequence, or sort A–Z after deduping
• Remove empty — drop blank lines

This removes duplicate lines, not duplicate words inside a paragraph. For repeated words in prose, use Duplicate Word Finder or Word Frequency.

Steps

1. Open Remove Duplicate Lines.
2. Paste one item per line.
3. Set case and empty-line options to match your data.
4. Copy the unique list back into your sheet or script.

To sort without deduping, use Text Sorter. To spot line-level edits between two versions of a list, use Text Compare.

FAQ

Does “first occurrence wins” mean later edits are lost?

Yes — if the same line text appears twice, only the first stay. Edit upstream if the second copy was the “correct” one.

Private?

Yes. Browser-only processing.