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Sync settings

Choose what your account keeps in step on every device where you are signed in.

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    Always synced: the tools on your board, their order and size.

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Turning something off removes it from your account straight away. Your devices keep their own copy.

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Your choice is stored in this browser only. Notifications never show personal content such as a message or a number. They work while a Synsi tab is open; closed tabs get none.

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Remove Duplicate Lines from Text

Paste a list and instantly remove repeated lines while keeping the original order of the first occurrences.

My tools →
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Lines
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Unique
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Removed
Runs in your browser – your data never leaves your device Also available via our free API

How to use the Remove Duplicate Lines

  1. 1 Paste your list or text with one item per line.
  2. 2 Choose whether the comparison is case-sensitive and whether to ignore spaces or empty lines.
  3. 3 Copy or download the deduplicated list.

Clean up lists in one step

Mailing lists, keyword exports, log files and product feeds often contain the same entry several times. This tool keeps the first occurrence of every line and removes the rest, so the order of your list stays intact.

Options explained

  • Case-sensitive – when enabled, Apple and apple are treated as different lines. Turn it off to catch duplicates that only differ in capitalisation, which is useful for email addresses and tags.
  • Ignore surrounding spaces – leading and trailing spaces are stripped before comparing, so apple and apple count as the same entry.
  • Remove empty lines – blank lines are dropped entirely instead of being kept once.

The counters show how many lines you started with, how many unique lines remain and how many duplicates were removed.

Common uses

  • Deduplicating email or customer lists before an import
  • Merging keyword lists from several SEO tools
  • Cleaning up copied spreadsheet columns
  • Finding the unique values in a log file

Your data stays on your device

Lists often contain personal data such as email addresses. Because this tool runs entirely in your browser, nothing is uploaded or stored.

Frequently asked questions

Does the tool keep the original order?

Yes. The first occurrence of each line stays in its original position; only later repeats are removed.

How many lines can I process?

Hundreds of thousands of lines are no problem, because everything runs locally on your device.

Can I sort the lines as well?

Use our Sort Lines tool on the result to sort alphabetically, numerically or by length.

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