New Analysis

The List Comparison Tool is a free, powerful browser-based utility designed to compare two lists of text, names, emails, or data. It instantly identifies differences, overlaps, and duplicates without sending your data to any server.

Yes, absolutely. This tool runs entirely in your web browser using JavaScript. No data is ever uploaded to the cloud or saved on our servers. Your privacy is guaranteed by design.

Yes, it is 100% free for everyone. There are no limits, hidden fees, or subscriptions required to use any feature of the tool.

You can import lists from Text files (.txt), CSV files (.csv), and JSON files (.json). The tool automatically detects the format and extracts the items for comparison.

Yes! Because the processing happens locally on your device, you can compare lists with tens of thousands of items in seconds, depending on your system's performance.

The "Deduplicate" option automatically removes duplicate entries within each individual list before comparing them. This ensures that you are comparing unique sets of items.

When "Case Sensitive" is checked, "Apple" and "apple" are treated as different items. If unchecked (default), they are considered equality.

"Ordered Mode" uses the Longest Common Subsequence algorithm to find items that appear in both lists in the same relative order, which is useful for comparing versions of code or text.

Yes. You can download your comparison results as a JSON file, a CSV file (Excel compatible), or a full HTML Report for sharing.

Yes. Once the page is loaded, the tool works completely offline. You don't need an active internet connection to perform comparisons.

This feature cleans your data by trimming leading and trailing spaces and converting multiple consecutive spaces into a single space, ensuring clean and accurate matching.

The tool automatically generates a "Union" list which contains all unique items from both lists combined. You can view, copy, or export this merged list.

Check the "Only in List A" or "Only in List B" result cards. These show items that are unique to each specific list.

Yes, the interface is fully responsive and works great on mobile phones, tablets, and desktop computers.

Absolutely. This tool is excellent for cleaning email lists, removing duplicates, and managing subscriber lists.

Yes. It automatically respects your system preference and also provides a manual toggle button in the header.

Your recent analysis sessions are saved in your browser's local storage so you can easily switch between them or come back later.

Yes. The "Export CSV" option creates a file that opens natively in Microsoft Excel, Google Sheets, or Apple Numbers.

Fuzzy Matching identifies similar items that aren't exact matches. We support three distinct algorithms: Levenshtein (for typos), Soundex (for phonetic/sound matching), and Sørensen-Dice (for semantic/shared character match).

The Side-by-Side Visual Diff provides a line-by-line comparison in a modal window. It highlights additions and deletions with synchronized scrolling, making it easy to compare versions of code or structured text.

Yes! The tool includes a Regex Replace feature. You can use standard JavaScript regex patterns (e.g., /pattern/g) to clean or transform your data before comparison.

No. The tool features Auto-Analysis, meaning results update instantly whenever you toggle a setting or move a slider. Manual "Compare" is only needed for the initial load or large manual data edits.

Yes, full editing history is supported. Use Ctrl + Z to undo and Ctrl + Y (or Ctrl + Shift + Z) to redo any changes to your lists or settings.

The Share button generates a specialized URL that encodes all your current data and options. Simply copy the link and send it to share your work with colleagues or clients.

Yes. Press Alt + ? to open the Shortcuts Modal. Common ones include Ctrl + Enter to compare, Alt + N for new analysis, and Ctrl + D for Visual Diff.

We provide visual data representations like Venn Diagrams and Distribution Charts. These help you understand the relationship between your lists at a glance.

We support all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. No plugins needed.