Remove Duplicate Lines
Paste a list and instantly remove repeated lines, keeping the first occurrence of each in its original order.
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What does the Remove Duplicate Lines do?
Duplicate entries creep into email lists, keyword lists, product SKUs and log files. This tool keeps the first time each line appears and removes later copies, telling you how many duplicates were found.
Options let you treat “Apple” and “apple” as the same, ignore stray spaces, drop empty lines and sort the unique results alphabetically.
How to use the Remove Duplicate Lines
- Paste your list with one item per line.
- Choose whether to ignore case and leading/trailing spaces.
- Optionally remove empty lines or sort the result A–Z.
- Copy or download the unique list.
Examples
Email list
A list of 500 addresses with 37 repeats becomes 463 unique addresses — the message shows “37 duplicate lines removed”.
Common use cases
- De-duplicating email and contact lists
- Cleaning keyword research lists
- Removing repeated log lines
- Preparing unique IDs or SKUs
Features and benefits
- Private by design — your data is processed on your device and never uploaded.
- Free with no account, no watermark and no usage limits.
- Works on phones, tablets and desktops in any modern browser.
Limitations to know
- Lines that differ only by punctuation (for example a trailing comma) are treated as different.
Frequently asked questions
Does it keep the original order?
Yes, unless you choose to sort. The first occurrence of each line is kept.
Can it compare case-insensitively?
Yes — tick “Ignore case”. The first version you entered is the one kept.
How many lines can it handle?
Hundreds of thousands of lines on a typical computer, since it uses fast in-memory lookups.
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