About ListDiff

What is ListDiff?

ListDiff is a collection of browser-based tools for comparing, cleaning, and transforming lists and text. Everything runs entirely in your browser — no data is ever sent to a server, no account required, and results are instant.

It's built for anyone who regularly works with lists: data analysts, developers, QA engineers, content editors, and anyone else who needs to compare two spreadsheet columns, clean up an export, or reformat a CSV.

Tools

• Compare Two Lists

  Find items that are in one list but not the other, items in both, and the full union.

• Text Fixer

  Trim spaces, remove duplicates, change case, split on a delimiter, prepend or append text, and more.

• CSV Splitter & Joiner

  Split a CSV row into separate lines, or join lines into a single CSV row with custom delimiters and quote styles.

• Text Columnizer

  Align delimited text into neat fixed-width columns — ideal for CSV, TSV, or pipe-separated data.

• Column Extractor

  Extract specific columns from CSV or delimited text by column number.

Privacy

ListDiff does not collect or store any of the text you enter. All processing happens locally in your browser. Your tool settings are saved in your browser's localStorage so they persist between visits, but nothing is transmitted to any server. See the Privacy Policy for details.