Compare Lists Online – Free & Private

Paste two lists to instantly find differences, matches, and combined results. Five set operations shown side-by-side. Pasted text is fully local; file parsing uses CDN libraries but your files are never uploaded.

Case sensitive Trim whitespace Ignore blank lines Unique (deduplicate)

List A

Drag & drop .txt, .csv, .tsv files

List B

Drag & drop .txt, .csv, .tsv files

Cursor 1:1 Lines 0 Chars 0 Size 0 B Cursor 1:1 Lines 0 Chars 0 Size 0 B

Why DiffLab List Compare?

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No Uploads

Pasted text is processed entirely in your browser. For file uploads, parsing libraries are loaded from a CDN, but your file content is never sent to or stored on any server.

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Instant Results

Results update instantly as you type or paste. No waiting, no loading screens, no submit button.

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Five Set Operations

See Only-in-A, Only-in-B, Intersection, Union, and Symmetric Difference side-by-side without switching tabs.

How It Works

Paste Your Lists

Enter or drag-drop your two lists into List A and List B, one item per line. CSV columns work too.

See Five Views

Instantly see what's only in A, only in B, in both, combined, and what differs across both lists.

Copy or Download

Export any result to your clipboard or as a .txt file with one click. Ready for Excel, Sheets, or code.

Frequently Asked Questions

How do I compare two lists?

Paste one list into List A and the other into List B, one item per line. DiffLab shows five set operations at once: items only in A, only in B, in both, combined, and differences.

Can I upload CSV or Excel files?

Yes. Paste a column from Excel/Sheets or drop a CSV/TSV file. The delimiter is auto-detected. For file uploads, parsing libraries are loaded from a CDN, but your file content is never sent to any server.

Is my data uploaded to any server?