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Duplicate Line Counter
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Quickly count the frequency of duplicate lines in your text. Ideal for data cleaning, log analysis, and text processing.
Overview
Understand what the tool solves, how it works, and the boundaries of its data.
Paste text with one list item per line to see how often each distinct line occurs. The unit being compared is the entire line, including its words, punctuation, digits, and any spaces that remain after the selected trimming rule. This is a frequency report: it counts entries and does not delete repeated lines from your original text.
The summary distinguishes total line segments, lines included in the count, and unique groups after the options are applied. Each result row shows a representative line, its count, and its share of the included lines. Rows are ordered from the highest count downward. Share is calculated as count ÷ included lines × 100 and displayed to one decimal place.
By default, leading and trailing whitespace is trimmed, blank lines are ignored, and letter case is preserved. Turn on case-insensitive matching to group Apple and apple; the row displays the spelling from the first matching entry. Turn off trimming if spaces at the ends should make entries distinct. Turn off blank-line filtering if empty entries should be included. When trimming is on, a line made only of whitespace becomes empty and follows the blank-line setting.
These rules affect comparison before counts are grouped. Internal spaces are not removed, words are not tokenized, and similar-but-not-identical lines are not fuzzy matched.
Guide
Follow the workflow and verify inputs and outputs with practical examples.
Paste or type plain text into the input. A newline separates one entry from the next; commas or spaces alone do not create separate rows.
Choose whether to ignore case, trim each line's outside whitespace, and ignore blank lines. The settings determine which entries are treated as equivalent and which count toward the denominator.
Results update as the text or options change. Compare total lines with included lines if blank entries were filtered, then use the descending frequency list to locate repeated values.
Individual summary values and row values have copy controls. Copying the full detail produces each displayed line followed by a tab and its count; it does not include a header or the percentage.
Use cases
See how the tool fits into real work and everyday tasks.
Paste one name, email address, or ID per line to find repeated entries and their frequency before you edit the source list. Decide whether capitalization and accidental spaces should count as differences.
Use the share column to see how much of the included list is represented by a repeated term. Ignoring case can combine differently capitalized entries, while trimming helps normalize accidental spaces at line edges.
Paste a selected excerpt when you need to see which full message lines recur. This reports exact line frequencies; it does not parse fields, compare partial messages, or diagnose the reason a log entry appeared.
Q&A
Find concise answers to common questions and confusing cases.
No. It reports each grouped line and its occurrence count. Use the report to decide what to change in your own text; the input is not rewritten into a deduplicated list.
They are ignored by default. Turn off the blank-line option to count an empty line as an entry. If trimming is enabled, whitespace-only lines also become empty before this choice is applied.
Case-sensitive matching is the default. Enable the ignore-case option to group them; the output label uses the first spelling encountered for that group.
It is that group's count divided by all lines included under your current options, rounded to one decimal place. Ignored blank lines are not in the denominator.
Notes
Review scope, result limitations, and important precautions before use.
The report counts exact whole-line groups after the selected case and edge-whitespace rules. It does not remove content, sort alphabetically, or perform semantic matching.
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