Remove Duplicate Lines
Remove duplicate lines while keeping the first occurrence. Helpful for lists of keywords, emails, or IDs.
About this remove duplicates tool
Remove duplicate lines while keeping the first occurrence. Useful for cleaning keyword lists, email lists, IDs, and any “one item per line” data.
Everything runs in your browser, so your text stays on your device and is not uploaded by this tool.
FAQ
Does it keep the original order?
Yes. It keeps the first occurrence and removes later duplicates, preserving your original order.
What does “Case-insensitive” mean?
If enabled, “Apple” and “apple” count as the same line. Disable it to treat them as different.
Why do similar lines not match?
Extra spaces or hidden characters can make lines appear different. Clean whitespace first for best results.
Will it remove empty lines?
Use the “Remove empty lines” option to drop blank lines.
Is my text stored anywhere?
No. The tool runs locally in your browser and doesn’t upload your text.