Japanese

List Difference Checker

UTILITY Check differences and common items between two lists
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How to use List Difference Checker
Provide the input text, data, or file. Choose the tool options that match your goal.
LIST DIFF
RESULT








Settings



















What this tool does


Compare two lists and find items unique to List A, items unique to List B, and items shared by both.


Illustration explaining how List Difference Checker works








How to use it


  1. Paste one list into List A and the other into List B, with one item per line.
  2. Choose whether to ignore leading or trailing spaces and letter case.
  3. Review items unique to each list and items shared by both.
  4. Click “Copy” to copy the comparison results.






Supported input and notes


Comparison is done by line, not character-by-character editing. Optional whitespace and case normalization can change which items count as matches.








When it is useful


Useful for comparing inventories, participant lists, IDs, or other line-based data.






Comparison Happens One Line at a Time
Each line is treated as one list item. This is useful for names, product codes, URLs, keywords, and other line-based lists.




Items on One Side Only
See which entries exist only in list A and which exist only in list B.


Items in Both Lists
Common entries that appear in both lists are shown separately.




Duplicates Count as One Item
Repeated entries inside the same list are merged before comparison. The tool compares whether an item exists, not how many times it appears.


Reduce Simple Formatting Differences
You can ignore spaces at the beginning and end of a line or compare letters without distinguishing uppercase and lowercase.


Spaces Inside an Item Remain
Ignoring outer spaces does not remove spaces in the middle of an item.


Different internal text means a different item: ABC 123 and ABC123 are treated as different entries.


FAQ


Does the same item appearing twice count twice?
No. Duplicate entries are combined before comparison.


Are blank lines shown as differences?
No. Blank lines are excluded from the comparison.


Can it show character-by-character edits in a paragraph?
No. This tool is designed for line-based list comparison.