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
CSV Compare
Free online CSV comparison tool. Upload or paste two CSV files and instantly find added, deleted, and modified rows. Supports key column selection, side-by-side view, search, and export. 100% private — runs in your browser.
What this CSV Compare tool does
This free CSV comparison tool lets you upload or paste two CSV files and instantly see every difference — added rows, deleted rows, and modified cells highlighted side by side. Select a key column to match rows accurately, search for specific values, and export the diff results. All processing happens in your browser with zero data uploaded to any server.
How to use this CSV Compare tool
- 1.Upload CSV files or paste CSV text into CSV A and CSV B.
- 2.Select a key column (or use row index) to match rows between the two files.
- 3.View differences instantly — added, deleted, and modified rows are highlighted.
- 4.Copy the diff or download it as a CSV or text file.
Frequently asked questions
Can I upload CSV files?
Yes. You can upload .csv or .tsv files for either side.
What is a key column?
A key column is used to match rows between the two CSVs. If no key is selected, rows are compared by position.
Can I export the results?
Yes. You can copy or download the diff results as a text file.
Is there a size limit?
The tool handles large CSV files efficiently. For very large files (100k+ rows), performance may vary by browser.