5 upvotes
What is FileCompare?
A simple yet powerful online text and file comparison tool. It quickly compares lists or text snippets, accurately highlighting additions, deletions, and changes. Ideal for code reviews, data deduplication, and proofreading.
How to use FileCompare
- 1
Paste your first list into the left text area (one item per line).
- 2
Paste your second list into the right text area.
- 3
Choose comparison options like case sensitivity or ignoring whitespace if needed.
- 4
Click 'Compare Lists' to see the results broken down by category.
- 5
Export any result set—A only, common, B only, or union—as JSON, CSV, or HTML.
Key features
Compares two lists line by line to highlight unique items, overlaps, and duplicates
Runs entirely in your browser, so your data never leaves your device
Exports results as JSON, CSV, or HTML table with one click
Adjustable settings: case sensitivity, ignore empty lines, normalize case, and more
Computes A-only, B-only, intersection, union, and symmetric difference at once
Use cases
- Marketers clean email lists by comparing lists to find new leads or remove duplicates.
- Data analysts validate datasets, cross-check record IDs, or spot missing entries.
- Developers quickly diff configuration files, server lists, or user inputs without writing a script.
- Students check research data for discrepancies or merge reference lists.
- Proofreaders identify changed items between document versions or glossaries.
Best for
MarketersData AnalystsDevelopersStudentsSmall Business OwnersProofreaders
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Frequently asked questions about FileCompare
Common questions to help you decide if FileCompare is right for you.
Yes, FileCompare is completely free. There are no paid plans, no registration requirements, and no limits on usage. The tool runs in your browser without any hidden costs.
You paste two lists (one item per line) into the provided fields, adjust settings like case sensitivity or ignore whitespace, and click 'Compare Lists'. The tool instantly computes differences, common items, and duplicates client-side.
Absolutely. All comparison processing is done locally in your browser using JavaScript. Your data is never uploaded to any server, so it remains private and secure on your own device.
Yes. You can export any result set—A-only, B-only, common items, or the full union—as a JSON file, CSV file, or HTML table with a single click.
You can toggle case sensitivity, ignore empty lines, ignore whitespace, remove special characters, normalize case, and choose sorting order (none, ascending, or descending) for the output.