Remove Duplicate Lines
Remove Duplicate Lines
Paste a list and remove repeated lines in one click. The first copy of each line is kept, in its original order. Your text stays on your device.
Duplicate lines creep into lists all the time. Merge two spreadsheets, combine email lists from different forms, copy names from several documents, or collect survey answers, and the same entry ends up appearing two, three, or ten times. Sending the same person the same message twice looks careless, and duplicate rows quietly ruin counts, totals, and imports. Removing them by eye is fine for ten lines and hopeless for ten thousand.
This tool reads your text line by line and keeps only the first occurrence of each line, in the order it first appears, so the cleaned list reads naturally. Three options control how strict the matching is. Case-sensitive matching treats "Apple" and "apple" as two different lines; leave it off and they count as the same. Ignoring leading and trailing spaces catches the duplicates that differ only by stray spacing, which is the most common hidden kind. You can also strip out blank lines at the same time.
The result box shows exactly what survived, and the status line reports how many lines were removed and kept, so you can sanity-check the outcome before using it. Everything runs in your browser — lists of customers, students, or contacts are never uploaded anywhere.
How to use
- Paste your list into the top box, one entry per line.
- Set the options: case sensitivity, ignoring surrounding spaces, and whether to drop blank lines.
- Click Remove Duplicates and read the cleaned list in the result box.
- Check the status line to confirm how many duplicates were found.
- Copy the result into your document, spreadsheet, or mailing tool.
Frequently asked questions
Which copy of a repeated line is kept?
The first one, in its original position and original form. Later repeats are removed. This preserves the order of your list instead of shuffling it the way sorting tools do.
Why did two lines that look identical both survive?
They probably differ invisibly — a trailing space, a tab, or different capitalisation. Tick "ignore leading and trailing spaces" and untick case-sensitive matching, then run it again; that combination catches nearly all look-alike duplicates.
Is there a size limit?
The tool runs on your own device, so very large lists — hundreds of thousands of lines — may take a few seconds and depend on your browser and memory. Ordinary lists of a few thousand lines are instant.
Is my data private?
Yes. The comparison happens locally in your browser. Your list is never sent to a server or stored after you close the page.
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