Remove Duplicate Lines
🔒 In your browserDelete repeated lines from a list while keeping the original order.
How it works
Remove repeated lines from a list while keeping the original order. Useful for cleaning email lists, keyword lists, log output and exported data.
Try an example
—🔒 Processed entirely in your browser — your text is never uploaded or stored.
About the Remove Duplicate Lines
This free tool removes repeated lines from a list while keeping the original order of the ones that remain. It's the fastest way to clean an email list, a keyword export, a set of URLs or log output without opening a spreadsheet.
It runs in your browser, so lists containing customer data or internal information never leave your device.
How to remove duplicates
- Paste your list, one item per line.
- Choose whether case matters — by default Apple and apple count as the same.
- Optionally ignore surrounding spaces, so ' item' matches 'item'.
- Keep the first or last occurrence of each duplicate.
- Copy the cleaned list, along with a count of what was removed.
How duplicates are matched
By default matching is case-insensitive and ignores surrounding whitespace, so "Apple" and " apple " count as the same line — usually what you want when cleaning an exported list. You can make it case-sensitive for an exact match, and choose whether to keep the first or the last occurrence of each duplicate. The original order of the surviving lines is preserved.
Frequently asked questions
Does it keep the original order?
Yes. Only the repeats are removed; the surviving lines stay exactly where they were, unlike a sort-based dedupe.
Is it case sensitive?
By default no, so 'Apple' and 'apple' are treated as duplicates. You can switch case sensitivity on if you need an exact match.
How many lines can it handle?
There's no imposed limit because the work happens locally — very large lists are only bounded by your device's memory.
Is my data uploaded?
No. Deduplication happens entirely in your browser, which matters for email and customer lists.
Does it keep the original order?
Yes. Only the repeats are removed; the remaining lines stay exactly where they were, unlike a sort-based dedupe that also reorders everything.
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🔗 Embed this tool on your website — free
Copy this and paste it into your page's HTML. The tool runs in the visitor's browser, just like here. Change height to fit, or add the optional auto-resize snippet below. Add ?theme=dark to the URL for dark mode.
<iframe src="https://toolhq.dev/embed/remove-duplicate-lines/" title="Remove Duplicate Lines — ToolsHub" width="100%" height="520" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" loading="lazy"></iframe>Optional: auto-resize the iframe height
Add this once on the same page so the iframe grows to fit the tool:
<script>
addEventListener("message", function (e) {
if (e.data && e.data.type === "toolshub:resize") {
document.querySelectorAll('iframe[src*="/embed/"]').forEach(function (f) {
if (f.contentWindow === e.source) f.style.height = e.data.height + "px";
});
}
});
</script>