Paste a list with one item per line and this tool returns every line only once, in the order it first appeared. It is a quick way to clean up email lists, keyword lists, product codes, log files, survey answers or anything exported from a spreadsheet.
You decide what counts as a duplicate: treat “Apple” and “apple” as the same, ignore stray spaces at the start and end of lines, and throw away blank lines. A counter shows how many lines were removed, and a table lists the entries that were repeated. Your list is processed locally and never uploaded.
How to use the Remove Duplicate Lines tool
- Paste your list into the left box, one item per line.
- Choose the options: Ignore case, Trim spaces, Remove empty lines.
- The unique lines appear on the right straight away, with a count of what was removed.
- Open Show which lines were repeated to see each duplicate and how often it appeared.
- Copy the clean list or download it as a .txt file.
Why use ToolOrca Remove Duplicate Lines
- Keeps the original order
- Case-insensitive matching option
- Trims spaces and removes blank lines
- Keep first or last occurrence
- Shows how many duplicates were removed
- Handles lists with 100,000+ lines
Tips for cleaning lists
Duplicates often hide behind invisible differences such as a trailing space, a tab or different capitalisation. Keep Trim spaces on and turn on Ignore case for email addresses, which are not case-sensitive in practice.
If you need the result in alphabetical order as well, tick Sort result A→Z, or use the Sort Lines tool for more sorting options such as natural number order or sorting by length.
Frequently asked questions
Does it keep the original order of my list?
Yes. The first time a line appears it is kept in place, and later copies are removed. Tick Keep last occurrence to keep the last copy instead.
How do I remove duplicates in Excel or Google Sheets data?
Copy the column, paste it here, remove the duplicates and paste the result back. Each cell becomes one line, so it works for any single column.
Can it remove duplicate words instead of lines?
It compares whole lines. To dedupe words, first put each word on its own line, for example with Find and Replace by replacing spaces with \n.
Is there a limit on list size?
There is no fixed limit. Lists with hundreds of thousands of lines work fine; the only limit is your device’s memory.