Remove Duplicate Lines

Paste your list and deduplicate by line with flexible rules. Keep order or sort, then copy or download the result.

lock Your text never leaves your browser.

sort

Result order

Keep input order (recommended) Keeps the first occurrence and preserves input order.

Sort then unique Deduplicates and sorts alphabetically.

rule

Case sensitive

Ignore leading/trailing spaces (trim) Trims for comparison only. Output keeps original lines.

Remove empty lines Drops blank or whitespace-only lines.

settings_suggest Advanced options

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Unicode normalization (NFKC) Unifies full-width/half-width and similar variants.

Trim output lines Also trims the lines that are kept.

Collapse tabs/spaces Turns consecutive spaces or tabs into one space.

Which line to keep

Keep the first occurrence Keep the last occurrence Output order stays by the first appearance.

Sort options (sort mode only)

Ascending Descending

Locale Leave blank to use your browser locale. Case-insensitive sort Ignores case when sorting (collation).

help

Can I keep the original order? expand_more

Yes. Choose “Keep input order” to keep the first appearance and preserve order.

Does it distinguish uppercase and lowercase? expand_more

Toggle “Case sensitive” to decide whether A and a are treated as different.

Can I ignore leading/trailing spaces? expand_more

Turn on “Ignore leading/trailing spaces (trim)” for comparison.

Are empty lines removed? expand_more

Enable “Remove empty lines” to drop blank or whitespace-only lines.

Is my data uploaded anywhere? expand_more

No. Everything runs locally in your browser.