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Compare Lists Online - Free List Diff Checker
Compare lists online with our free list diff checker. Easily compare two lists, spot differences, and analyze data like followers and following lists.
lockPrivate & Secure: Processed Locally in Your Browser
List A0
List B0
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Comparison Settings
How to Export Your Instagram Data
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Auto-Clean Headers
Removes "Following" & metadata lines automatically.
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Extract Usernames
Smartly separate usernames from dates/times.
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Simple Comparison
Ready-to-use output for instant comparison.
screenshot_monitorStep-by-Step Guide
list_altQuick Summary
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Go to Instagram Settings → Accounts Center
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Select "Your information and permissions"
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Click "Export your information"
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Tap "Create export"
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Choose "Export to device"
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Select your Instagram profile
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Tap "Customise information and uncheck all the options"
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Into connections section only select "Followers and following" then tap Save
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Select date range to "All time" and verify format is "HTML" then tap "Start export"
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When ready (it takes 5-10 minutes), tap "Download"
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Unzip the file to find `followers_1.html` and `following.html`
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Upload followers_1.html to List A and following.html to List B then click "Compare Lists"
Why Use Our Compare Lists Tool?
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Compare Two Lists Instantly
Easily compare two lists of any size. Our tool processes your data instantly in your browser, providing immediate results for quick analysis without any server delays.
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Compare 2 Lists with Precision
Use our advanced options like Case Sensitivity, Ignore Spaces, and Fuzzy Matching for precise comparisons. Perfect for clean data, code diffs, or finding near-matches in user lists.
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Advanced List Compare Features
Get comprehensive comparison results including items unique to each list, common items (intersection), and a complete union. Visualize the differences with our interactive Venn Diagram.
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Private & Secure Processing
Your data never leaves your device. Unlike other tools, we use local browser processing to ensure your sensitive lists, emails, or user data remain 100% private and secure.
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ListDiff Algorithm
Powered by our advanced ListDiff algorithm, we ensure 100% accuracy in detecting every difference. Whether it is code, unstructured text, or data arrays, our engine identifies unique and common items with mathematical precision.
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Compare Followers and Following
The ultimate tool for Instagram growth. Upload your followers and following HTML files to instantly spot unfollowers. Our smart filters automatically clean dates, headers, and metadata to give you a clean list of who is not following you back.
Smart Ways to Compare Two Lists in Different Scenarios
Clean & Merge Data
Effortlessly compare spreadsheet columns or database exports. Identify new entries, spot missing data, and merge duplicates for clean, accurate reporting.
Optimize Email Lists
Keep your subscriber lists healthy. Instantly isolate unsubscribes, find active overlaps between campaigns, and remove invalid duplicate emails.
Code & Config Diff
Essential for developers. Compare configuration files, dependencies, or variable lists between environments (Dev vs. Prod) to prevent deployment errors.
E-commerce Stock Control
Reconcile inventory fast. Compare supplier lists against your warehouse stock to track SKUs, identify out-of-stock items, and prevent over-ordering.
SEO Keyword Gap Analysis
Dominate search results. Compare your keyword strategy against competitors to find missing opportunities, common terms, and unique content gaps.
QA & Database Integrity
Automate your quality assurance. Validate data migrations by verifying that source and destination record IDs match perfectly, ensuring zero data loss.
Mastering the Comparison Options
Our tool is packed with powerful filters to handle any data format. Here is how each improved option helps you get the perfect result.
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Instagram Format
Specifically designed for social media managers. It automatically detects and removes metadata like "Following", "Followers", dates, and timestamps (e.g., "Jan 15, 2026"), leaving you with a clean list of usernames for accurate follower comparison.
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Case Sensitive Comparison
By default, our tool treats "apple" and "Apple" as the same item. Enable this option if you need precision matching where capitalization matters, such as when comparing passwords, code variables, or case sensitive IDs.
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Ignore Whitespace Options
Messy data often has hidden spaces. "Ignore Begin/End Spaces" trims padding, while "Ignore Extra Spaces" normalizes double spaces into single ones. Essential for cleaning up copy-pasted data from PDFs or websites.
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Smart Match (Fuzzy Logic)
Our standout feature. Unlike standard exact matching, Fuzzy Match identifies items that are "similar enough." Perfect for finding typos (e.g., "John Doe" vs "John Doe") or minor spelling variations in large datasets.
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Ignore Leading Zeroes & Line Numbers
Working with data exports? "Ignore Leading Zeroes" treats "007" and "7" as identical. "Line Numbered" strips prefixes like "1. Item" or "2) Item" so you can compare the actual content without reformatting.
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Sort & Transformation Tools
Don't just compare—organize. Sort your output A-Z, Z-A, or by length. You can also instantly convert results to UPPERCASE, lowercase, or Title Case to standardize your final list for reporting.
Frequently Asked Questions
?How does Compare Lists Online work?
Our tool uses advanced local algorithms to instantly analyze two datasets directly in your browser. Simply paste your text or drag & drop files, and it automatically highlights unique items, duplicates, and intersections (common items) without sending any data to a server.
?What types of lists can I compare?
You can compare virtually any text-based data! This includes email marketing lists, software code snippets, database IDs, e-commerce product SKUs, inventory spreadsheets, or even simple student attendance lists.
?Is my data private and secure?
Yes, 100% secure. All comparisons happen locally in your browser. No data is ever sent to our servers, ensuring your lists remain completely confidential.
?Is this tool free to use?
Yes, our list comparison tool is completely free with no hidden charges, subscriptions, or daily limits. Compare as many lists as you need.
?Does it support Excel or CSV files?
Absolutely, you can drag and drop .csv, .xlsx, .json, and .txt files directly into the input boxes, or use the upload button to select them from your device.
?Is there a limit to how many items I can compare?
You can compare thousands of lines instantly. The only limit is your browser's memory, which allows for handling massive lists with ease.
?Can I compare lists on my mobile phone?
Yes! Our tool is fully responsive and optimized for mobile devices, making it easy to clean, sort, and compare lists directly from your smartphone or tablet.