Remove Duplicate Lines — Dedupe Any List

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Paste a messy list → get clean unique lines, plus a report of what was removed.

Your list (one item per line)

Result

How to use this tool

1. Paste your list — one item per line (emails, keywords, IDs, names).
2. Press Remove duplicates — exact-match duplicates are dropped, first occurrence kept.
3. Copy result gives you the clean list. Blank lines are collapsed too.

Example

A 1,000-row email list with 217 repeats → 783 unique rows, order preserved — so the first entry of every customer stays at the top.

The formula

walk the lines once, keep the first of each exact match (a hash-set of seen lines)

What the result means

This is exact-line deduplication — 'Apple' and 'apple' are different entries, and ' apple' with a stray space is a third. Clean whitespace first with the Remove Extra Spaces tool if your data came from spreadsheets, then dedupe for the true count.

Frequently asked questions

Is the comparison case-sensitive?

Yes — 'Dhaka' and 'dhaka' are kept as different lines. For case-insensitive dedup, convert the whole list to lowercase first with the Case Converter, then dedupe here.

Does it keep the original order?

Yes — the first time each line appears is the one kept, and the sequence of those firsts is preserved. No silent alphabetizing.

Can it remove duplicates inside a line (words)?

No — this tool is line-based. Word-level dedup is a different job for a different bench.

Is my list uploaded?

No — the list never leaves your browser, which makes this safe even for customer data.

More tools from Paper Port

Text SorterSort any listRemove Extra SpacesClean messy textCase ConverterUPPER, lower, Title…Word CounterWords, characters, reading time

Explore the island world

• Paper Port — the island where this tool lives.
• The Main Island — drive the boat, explore the whole world.
• The 90s Kids Island — where most of us started.

Privacy & data: this tool runs entirely in your browser — nothing you type is uploaded, saved or sent anywhere. · Disclaimer: text is processed locally and never uploaded; always keep your own backup of important documents. · Privacy Policy · Disclaimer