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Remove duplicate lines from text to quickly clean up lists, logs, keywords, and other data.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
This duplicate line remover treats each newline-separated entry as a whole unit. It keeps the first occurrence of each distinct processed line and preserves the order in which those first occurrences appeared. It does not compare words, individual spreadsheet columns, or similar meanings.
Three options define “same.” Ignore case is off initially, so Apple and apple remain separate unless you turn it on. Trim leading and trailing whitespace is on initially; when enabled, the trimmed text is both compared and shown in the result. Spaces or tabs inside a line are not removed. Ignore empty lines is also on initially, so entries that are empty after the trim step are skipped.
The result reports original lines, result lines, and removed lines. “Removed” is the original line count minus the number kept. It can include both duplicate entries and blank lines skipped by the empty-line option, so it is not the number of duplicate groups. A trailing newline creates a final empty entry when the text is split; with empty-line removal enabled, that entry is included in the original count and removed from the result.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Paste a list of names, IDs, URLs, keywords, log entries, or rows copied from a spreadsheet. A row with several tab-separated columns is compared as one complete line.
Enable Ignore case to combine letter-case variants. Leave trimming on to disregard spaces at the edges, or turn it off when those characters carry meaning. Turn off Ignore empty lines if you need blank entries to remain eligible for the output.
Check the original and result counts, then inspect representative lines and the retained first occurrence. Copy the result when the ordering and formatting are right.
For example, with the default settings, Cedar , cedar, and CEDAR produce Cedar and cedar: edge spaces are trimmed, but case remains significant. Turning on Ignore case reduces that pair to the first processed spelling, Cedar.
Use cases
See how the tool fits into real work and everyday tasks.
Remove repeated email addresses, item codes, or contact entries before moving a pasted list into another workflow. Preserve the original list first if repeated entries have meaning, such as frequency or ranking.
Keep the first-seen order while removing exact repeated lines. URL variants with different parameters, capitalization, or trailing slashes remain distinct unless the text itself is identical under the selected options.
Paste the rows as text to remove only fully repeated rows. If the task is to deduplicate by one field, first isolate that column; this tool does not select a key column.
Collapse repeated complete log lines for a quick scan. Lines that differ by a timestamp, ID, punctuation, or any other character remain separate, so this is not event grouping or fuzzy matching.
Q&A
Find concise answers to common questions and confusing cases.
Only when Ignore case is enabled. With the default setting, uppercase and lowercase letters are different characters.
Blank lines skipped by Ignore empty lines are included in the removed total. Check that option and the original line count, especially when the input ends with a newline.
No. Each pasted row is compared in full, including its tabs and every field. To match on one column, copy that column by itself or use a spreadsheet workflow that supports selecting a key.
Notes
Review scope, result limitations, and important precautions before use.
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