Remove Duplicate Lines
Strip repeated lines from a list, with options for case, whitespace, blanks and sorting.
How to use this tool
- Paste or type your text into the box above.
- The result updates as you change the input — there is nothing to submit and nothing to wait for.
- Read the figures in the result panel, or copy the converted text.
- Use Copy or Download if you need the output elsewhere. Nothing was uploaded at any point.
The first occurrence of each line is kept and later repeats are dropped, so the original order survives unless you ask for sorting. Comparison options change what counts as a duplicate without altering the output text.
Remove Duplicate Lines — the specification
| Keeps | The first occurrence of each line |
|---|---|
| Ignore spaces | Compares trimmed lines |
| Ignore case | Treats Apple and apple as the same |
| Remove blanks | Drops empty lines |
| Sort | Optional alphabetical ordering |
How it works
This tool runs entirely in your browser. There is no server involved, which means nothing you type or upload is transmitted, stored, or logged — and there are no usage limits, because there is nothing for us to ration.
You can confirm it yourself: open your browser's developer tools, select the Network tab, and use the tool. No request is made.
A worked example
Run against this page’s own code, with the real input and the real output reproduced below.
What went in
ssc-cgl ibps-po ssc-cgl neet ibps-po upsc neet ssc-chsl upsc ssc-cgl
What came back
| Lines in | 10 |
|---|---|
| Lines out | 5 |
| Duplicates removed | 5 |
Everything above happened in the page as the text was typed. Nothing was sent to a server, which is why it works offline once the page has loaded and why there is no limit on how often you use it.
Who needs Remove Duplicate Lines
Cleaning email lists, keyword lists, URL lists, log files and any exported data with repeated rows.
Remove Duplicate Lines — frequently asked questions
Which duplicate is kept?
The first. Later occurrences are removed, so the original ordering of unique lines is preserved.
Does it change the text itself?
Only if you enable trimming, which removes leading and trailing spaces from the output as well as from the comparison. Otherwise lines are kept exactly as written.
Is there a size limit?
Only your browser’s memory. Lists of tens of thousands of lines process instantly.
Does this work offline?
Yes. Once the page has loaded you can disconnect from the internet and it keeps working, because all the processing happens in your browser. That is also the simplest way to confirm nothing is being sent anywhere.
Can I use this on a phone?
Yes. The layout adapts to a small screen and everything works the same way.
Is this tool really free?
Yes. No account, no trial period, no watermark on the output and no cap on how many times you use it. The site is funded by advertising.
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Background reading: Text and Developer Tools That Never Upload Your Data
Your file never leaves your device. Open your browser's Network tab while you use this page and you will see no upload — how that works.
Disclaimer. Published requirements change without notice. Confirm against the official source before you submit. Full disclaimer.