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Text CleanerBuild a reusable cleanup pipeline for untidy text and lists.Remove Duplicate LinesDeduplicate lines while controlling case, whitespace, order, and blanks.Remove Empty LinesDelete blank rows or collapse them while preserving paragraph structure.Trim WhitespaceRemove unwanted leading or trailing whitespace with indentation control.Remove Extra SpacesNormalize repeated spaces, tabs, and non-breaking spaces safely.Sort LinesSort text alphabetically, naturally, numerically, or by length.Add Prefix and SuffixWrap, number, or punctuate every line with practical presets.Delimiter ConverterConvert lists between lines, commas, tabs, pipes, and custom separators.Compare Two ListsFind unique, shared, and duplicated items across two lists.Find and ReplaceReplace plain text or guarded regular-expression matches.

Lists and comparison

Compare Two Lists

See what changed, what overlaps, and what repeats without using formulas.

Processed locally in your browser. Your data is never uploaded or stored.
Processed locally in your browser. Your data is never uploaded or stored.

Ready

Input · List A0 lines · 0 characters
Input · List B0 lines · 0 characters
Output0 lines · 0 characters
OptionsAdjust how this tool processes your text
Compare Two Lists options
Press Ctrl/Cmd + Enter to process

Keep tidying

Lists and comparisonRemove Duplicate Lines

Deduplicate lines while controlling case, whitespace, order, and blanks.

Open tool →Formatting and conversionDelimiter Converter

Convert lists between lines, commas, tabs, pipes, and custom separators.

Open tool →Lists and comparisonSort Lines

Sort text alphabetically, naturally, numerically, or by length.

Open tool →

What this tool does

A focused tool for a specific cleanup job

Compare Two Lists builds five result sets from two pasted inputs. Matching can ignore case and surrounding whitespace while the displayed values still come from the original lists.

Common use cases

  • Compare old and new inventory lists
  • Find missing campaign keywords
  • Check membership between two exports
  • Identify duplicates inside either source list

How to use Compare Two Lists

  1. Paste the first collection into List A and the second into List B.
  2. Choose line or custom-delimited input.
  3. Set case, whitespace, order, and sorting rules.
  4. Switch result tabs to inspect each set and its count.

Options explained

  • Only in A and Only in B are directional differences.
  • In both lists contains the first List A representation of shared keys.
  • Duplicate tabs show repeated values after the first occurrence.
  • Preserve order follows source order unless sorting is enabled.

Example

Before
A: apple, pear
B: pear, plum
After
Only A: apple
Only B: plum
Both: pear

Edge cases and limitations

  • Matching rules can make visually different values equivalent.
  • Custom delimiter mode supports one separator at a time.
  • Duplicate output reports repeated occurrences, not just unique duplicate keys.

Questions

Compare Two Lists FAQ

Can I compare comma-separated values?

Yes. Switch the input mode to custom delimiter and use a comma.

Are my lists sent anywhere?

No. Both lists are compared locally in the current browser tab.