Remove Duplicate Lines Online Free — Dedupe Text

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Remove Duplicate Lines — transform your text instantly error runs in your browser · nothing uploaded

⌃⏎ run · ⎋ clear · / focus input

LINES ⇅ upload

⇅ drop a file to load it

UNIQUE LINES

send output to

no matches

Handles pastes up to ~5MB smoothly in your browser — bigger files still work, just budget a second or two.

Remove Duplicate Lines Online

Updated 2026-07-09

Remove duplicate lines from text online for free. Paste a list and SnapTools keeps the first occurrence of each line and drops the rest — instantly, in your browser. Order is preserved and nothing is uploaded.

De-duplicating a list by hand is error-prone, especially when duplicates differ only in case or have stray whitespace. This tool handles both with optional case-insensitive and whitespace-insensitive matching, keeping the first of each unique line in its original position. It is ideal for cleaning lists of emails, IDs, or log lines before you use them.

// how to use

1 Paste your list or text into the input panel on the left.
2 SnapTools removes repeated lines, keeping the first occurrence of each, as you type.
3 Optionally ignore case or surrounding whitespace, then copy or download the result.

// examples

Deduplicate a list

Input

apple
banana
apple
cherry

Output

apple
banana
cherry

Ignore case

Input

Hello
hello
HELLO

Output

Hello

// common uses

Cleaning duplicate entries from a list or log De-duplicating email or ID lists Removing repeated rows before importing data Tidying merged files with overlapping lines

// faq

No. Deduplication runs entirely in your browser, so your text never leaves your machine.

Yes. The first time each line appears is kept in place, and later duplicates are removed, so the surviving lines stay in their original order.

Yes. Turn on the ignore-case option and lines that differ only in capitalisation — like "Hello" and "hello" — are treated as duplicates.

There is an option to ignore surrounding whitespace, so lines that are identical apart from stray spaces or tabs are collapsed together.

This removes duplicate lines while preserving order. Sort Lines reorders lines alphabetically and can also remove duplicates as part of sorting — use whichever fits your goal.

// related

Sort & Dedupe Lines Remove Duplicate Words Remove Extra Blank Lines Whitespace Remover Character & Word Counter

Use this via API

Get a free API key →

curl -X POST https://snaptools.dev/api/v1/tools/remove-duplicate-lines \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"text":"apple banana apple cherry"}'