List & Array Tools
A set of utilities for lists and arrays: find intersections and set differences, merge lists while removing duplicates, shuffle lines with the Fisher-Yates algorithm, add numbering and prefixes. Perfect for reconciling mailing lists, to-do items, product IDs and any ranges copied from spreadsheets.
8 tools
In this category
Compare Two Lists / Arrays
Compare two lists and find items unique to each, plus common items
List Randomizer / Shuffle
Shuffle and randomize list items using the Fisher-Yates algorithm
List Intersection (Common Items)
Find common items between two lists with case-sensitive toggle
List Union (Merge & Dedupe)
Merge two lists together and remove duplicates
List Difference (A − B)
Find items in List A that are not in List B (set difference)
Remove Empty Lines
Remove empty and blank lines from text instantly
Add Line Numbers
Add line numbers to text with customizable start number, separator, and padding
Add Prefix / Suffix to Lines
Add prefix and/or suffix text to each line of input
Each tool processes thousands of lines in a fraction of a second and requires no installation — just paste your list and copy the result.