Compare Two Lists Online - List Diff & Instagram Analysis

Compare two lists quickly and find differences, matches, and unique items. Perfect for data analysis, text comparison, and Instagram follower analysis.

List A

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List B

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How to Use This Tool

Input Methods

  • Type or paste your items directly into List A and List B text boxes
  • Each item should be on a new line
  • Optionally add descriptions for your lists

Comparison Results

  • Click "Compare Lists" to see results
  • View items unique to each list
  • See items present in both lists
  • Use the copy button (šŸ“‹) to copy results
Tip: Enable "Case Sensitive" if you want to treat uppercase and lowercase letters as different characters.

Frequently Asked Questions

How does the list comparison work?

The tool compares two lists and shows four different results:
  • Items only in List A (A - B)
  • Items only in List B (B - A)
  • Items in both lists (A āˆ© B)
  • All unique items (A āˆŖ B)

What file formats are supported?

You can paste text directly into the input boxes. Each item should be on a new line.

What does "Case Sensitive" mean?

When Case Sensitive is enabled, "Item" and "item" are treated as different items. When disabled, they are treated as the same item.

How can I copy the results?

Each result section has a copy button (šŸ“‹) in the top right corner. You can also click into any result area and use Ctrl+A (Cmd+A on Mac) to select all text, then Ctrl+C (Cmd+C) to copy.

Is there a limit to list size?

The tool processes lists client-side in your browser. While there's no strict limit, very large lists (100,000+ items) might affect performance.

Why Use Our Compare Lists Tool?

Compare Two Lists Instantly

Easily compare two lists of any size. Our tool processes your data instantly, providing immediate results for quick analysis.

Advanced List Compare Features

Get comprehensive comparison results including items unique to each list, common items, and a complete union of both lists.

Compare 2 Lists with Precision

Use our case-sensitive option for precise comparisons. Perfect for comparing code, usernames, or any text where case matters.

ListDiff Technology

Powered by efficient algorithms, our ListDiff feature quickly identifies all differences between your lists, saving you time and effort.

Smart Ways to Compare Two Lists in Different Scenarios

Data Analysis

Compare spreadsheet data, CSV files, or database exports to identify changes, updates, and discrepancies in your datasets.

Email List Management

Clean and deduplicate email lists, find new subscribers, or identify unsubscribed users by comparing multiple mailing lists.

Code Comparison

Compare lists of variables, functions, or dependencies between different versions of your code to track changes and updates.

Inventory Management

Compare product lists, SKUs, or stock levels between different periods to track inventory changes and identify discrepancies.

Text Analysis

Compare word lists, keyword sets, or text content to identify unique phrases, common terms, or content differences.

Data Validation

Verify data integrity by comparing source and target datasets, finding missing entries, or validating data transformations.

More Powerful Analysis Tools

Instagram Follower Analyzer

Discover who doesn't follow you back, who you don't follow back, and your mutual connections. Upload your Instagram data and get detailed insights - completely private and secure.

Try Instagram Analyzer

Advanced Features to Compare Lists Like a Pro

Smart List Comparison with Case Sensitivity

Choose between case-sensitive and case-insensitive options when you compare two lists. Perfect for comparing code variables, usernames, or casual text content. Our intelligent matching algorithm ensures accurate results regardless of text formatting.

Duplicate Detection

Automatically identify and highlight duplicate entries within each list. Understand your data better by seeing which items appear multiple times and their frequency of occurrence.

Export Options

Export your comparison results in multiple formats including CSV, TXT, and JSON. Perfect for further analysis or integration with other tools and workflows.

Whitespace Handling

Intelligent whitespace handling options let you choose whether to trim spaces, normalize line endings, or keep exact formatting. Essential for comparing formatted text or code snippets.

Large List Support

Efficiently compare large lists with thousands of items. Our optimized comparison engine handles substantial datasets while maintaining fast performance and accurate results.

Custom Delimiters

Support for various list formats with custom delimiter options. Compare lists separated by newlines, commas, tabs, or any custom delimiter of your choice.

Using Instagram Format Mode

Our tool supports Instagram data format! Enable "Instagram Format" checkbox to automatically clean Instagram export data and extract usernames for comparison. For advanced Instagram analysis, try our dedicated Instagram Analyzer.

What Instagram Format Mode does:

  • Removes header lines like "Instagram", "Following", "Followers"
  • Extracts usernames and skips timestamps
  • Cleans mixed text data automatically

Example: "wzthunder\nJul 13, 2025 5:43 pm" ā†’ "wzthunder"

How to get your Instagram data:

šŸ“– View step-by-step guide with screenshots

Step 1 of 8

  1. Select Download or transfer information.

    The Instagram 'download your information' tool landing page.

  2. Select a single Instagram account.

    A selection list of your Meta accounts. One single Instagram account is selected.

  3. Select Some of your information.

    How much information do you want? You can get all available information for your selected profile or choose specific information. Option 1: All available information. Your file will include a complete copy of information for your selected profiles. May take longer to download. Option 2: Some of your information. Your file will include the information you choose for your selected profiles.

  4. Scroll to Followers and following and select it.

    A list of the types of downloadable data. The only type selected is 'Followers and following' under the 'Connections' section.

  5. Choose Download to device.

    What do you want to do with your information? Option 1: Download to device. Option 2 (selected): Transfer to destination

  6. Set Date range to All time.

    Set Format to HTML.

    Select Create files.

    Create files to download. Date range: All time. Format: HTML.

  7. Wait for Instagram to generate the files.

    This may take a few minutes.

    Current activity. One file set in progress.

  8. Select Download, then enter your password.

    Current activity. Available downloads: one file set.
Use arrow keys or click buttons to navigate
Quick summary:
  1. Go to Instagram Settings ā†’ Privacy and Security ā†’ Data Download
  2. Request a download of your data
  3. Select "HTML" format and "Followers and following" only
  4. Wait for Instagram to prepare your data (this can take up to 48 hours)
  5. Copy the text content from your downloaded files
  6. Paste into our tool and enable "Instagram Format" checkbox

šŸ’” Tip: You can compare your followers vs following lists to find who doesn't follow you back!

Frequently Asked Questions About Comparing Lists Online

How does our list comparison tool work to compare 2 lists?

Our tool uses advanced algorithms to compare lists and analyze differences between two lists of items. It identifies common elements, unique items in each list, and can detect duplicates. The comparison can be customized with options for case sensitivity, whitespace handling, and custom delimiters. Perfect for comparing code, usernames, or any text content.

What are the key features of our list comparison tool?

When you compare lists with our tool, you get smart case sensitivity options, duplicate detection, custom delimiter support, and intelligent whitespace handling. You can export results in multiple formats (CSV, TXT, JSON) and process large lists efficiently. The comparison engine is optimized for both small and large datasets while maintaining fast performance.

Is there a limit to the list size?

Our tool is optimized to handle lists with thousands of items efficiently. For very large lists (over 100,000 items), we recommend using our batch processing feature for optimal performance. The free version supports lists up to 10,000 items per comparison.

Can I save my comparison results?

Yes! You can export your comparison results in various formats including CSV, TXT, and JSON. This makes it easy to save your results for future reference or further analysis in other tools. Premium users also get access to cloud storage and comparison history.

Is my data secure?

We take data security seriously. All list comparisons are processed in your browser, meaning your data never leaves your device. We don't store any of your comparison data on our servers unless you explicitly choose to save it (premium feature).

What types of lists can I compare?

Our tool supports various types of lists including text lines, comma-separated values, code snippets, email lists, and more. You can compare lists with different delimiters and formatting, making it versatile for both technical and business use cases.

Why Choose Our Tool to Compare Lists Online?

Compare Lists for Business Needs

  • āœ“Compare two lists to streamline data validation and quality assurance
  • āœ“Efficiently manage customer lists and mailing databases
  • āœ“Track inventory changes and product catalog updates
  • āœ“Compare sales data across different time periods

Compare Lists for Development Tasks

  • āœ“Compare code dependencies and package versions
  • āœ“Analyze API response differences between environments
  • āœ“Debug configuration changes across deployments
  • āœ“Track database schema modifications

Ready to Compare Your Two Lists Online?

Start using our powerful list comparison tool today to compare lists quickly and accurately. It's free, fast, and requires no registration. Perfect for both occasional use and professional data analysis needs.