Duplicate Line Remover

Remove repeated lines with optional sorting and trimming.

FREE - NO SIGN-UP - RUNS ON YOUR DEVICE

Runs locally in your browser

  • Liveresult
  • 0uploads
  • 1 tapto copy
  • Freeno account
In practice

What you can count on

  • 0uploads
    • Your input stays on this device
    • Nothing is sent for processing
  • Liveoutput
    • Results update in the working area
    • Change inputs and compare instantly
  • 1 tapto copy
    • Copy the result
    • No account or install needed
Specification

Duplicate Line Remover at a glance

Input
One line per item, with cleanup choices.
Output
Unique lines, and the two counts
Method
A local comparison, case optional
Ignore case
First spelling is the one kept
Price
Free
Where processing happens
On your device
How to

How to use Duplicate Line Remover

  1. 1

    Paste your lines

    Put your list into the Lines to clean box, one item per line.

  2. 2

    Set the three switches

    Trim whitespace, ignore case and sort. The unique lines appear underneath, keeping the first occurrence unless sorting is on.

  3. 3

    Copy the clean list

    One Copy button takes the deduplicated lines back to your clipboard.

Questions

Frequently asked questions

Does this work without uploading anything?

Yes. The tool processes your input inside the browser tab. Nothing is sent to a processing server or stored in an account.

Can I change the result before copying it?

Yes. Adjust any available control and the result updates. Copy it only when the output matches what you need.

Which browsers are supported?

Current versions of Chrome, Edge, Firefox and Safari support the browser features used here. Very old browsers may lack a required API.

Background

What counts as a duplicate

Lines are matched on their exact characters, so a different capital makes two lines look different. Surrounding spaces are trimmed before the comparison unless you turn that off.

  • The first time a line appears is the copy that is kept, so the order of your list survives.
  • Blank lines are lines too. Take them out first if you want a single blank line between blocks.

Full specification

Specification of the Duplicate Line Remover tool
InputOne line per item, with cleanup choices.
OutputUnique lines plus removed and remaining counts.
MethodA local Set comparison with optional case normalization.
Ignore caseMatching ignores case, but the line that survives is the first one as you typed it — Apple, apple, APPLE leaves Apple.
PriceFree. Supported by clearly labeled ads outside the working area.
Where processing happensIn your browser tab. Your input is never uploaded.
Next step

Keep going with the same files

All text tools: Text tools on SPOTTOOLS