Duplicate lines remover
About the Duplicate Lines Remover
The Duplicate Lines Remover collapses repeated lines, with options to keep the original order, sort the result or be case-insensitive.
How to use it
- Paste text with duplicates.
- Choose keep-order or sort.
- Copy the cleaned result.
When to use it
- Cleaning log files.
- Deduplicating CSV exports.
- Building a unique tag list.
Duplicate lines are common in messy exports — the same IP repeating in a log, the same row appearing twice in a CSV, the same tag listed over and over. This tool collapses those repeats so each line appears only once, giving you a clean, unique list in a single pass.
You stay in control of how it cleans: keep the original order of first appearance, sort the result, or ignore letter case so HEADER and header count as the same entry. That flexibility matters because the right behaviour differs between a log file and a word list.
How to Use the Duplicate Lines Remover
- Paste your text with one item per line.
- Choose whether to keep the order, sort, or ignore case.
- Copy the de-duplicated result.
Practical Use Cases
Clean a log file so each unique entry appears once, remove repeated rows from a CSV or spreadsheet export, and build a unique list of tags, keywords or addresses for further processing.
Order vs. Sort
Keeping the original order preserves the sequence in which values first appeared, while sorting reorganises the list alphabetically. Both remove duplicates; choose based on whether the sequence carries meaning.
Deduplication — common questions
Will it change lines that are not duplicated?
No. Lines that appear only once are kept exactly as they are; the tool only removes the repeated occurrences.
What does case-insensitive do?
It treats entries that differ only by letter case as the same line, so "Apples" and "apples" collapse into one instead of staying as two.
Is my data uploaded?
No. The cleanup runs in your browser, so your list or log never leaves your device.
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