Is my data private?
Yes. All comparison happens entirely in your browser. No data is ever sent to a server.
100% private • Runs in your browser • No server upload
List Comparer
Free online list comparison tool. Paste two lists and instantly find common items, items only in list A, items only in list B, and duplicates. Supports text upload, auto-dedup, sort, search, and export. 100% private — runs in your browser.
What this List Comparer does
This free list comparison tool lets you paste or upload two lists and instantly discover what they share and where they differ. Find common items, identify items unique to list A or list B, and spot duplicates — all without uploading anything to a server. Everything runs locally in your browser.
How to use this List Comparer
- 1.Paste your data into List A and List B, one value per line, or upload .txt files directly.
- 2.View the results in real time — common items, items only in A, items only in B, and duplicates are shown instantly.
- 3.Use the search bar to filter results, toggle sort order, or enable auto-dedup to remove repeated entries.
- 4.Export any result set as a text file for use in spreadsheets, databases, or other tools.
Frequently asked questions
Can I upload text files?
Yes. You can upload .txt files for either list.
What does auto-dedup do?
Auto-dedup removes repeated lines from each list before comparison.
Can I export the results?
Yes. You can export any result set as a .txt file.
Is there a size limit?
The tool handles large lists efficiently. For very large datasets (100k+ lines), performance may vary by browser.