How to use
- Choose two CSV/TSV files or paste their data.
- Select the key column on each side, such as ID or email.
- Review rows found on only one side and download the full differences.
Privacy and data handling
Input and output are processed by the current browser tab. The site has no content upload API and does not write your content to an account or cloud storage.
Formats and limitations
Supports comma, tab, and semicolon delimiters with standard quoted fields. This version compares one exact key column and does not perform fuzzy name matching.
Frequently asked questions
Can I open an Excel file directly?
Export it as UTF-8 CSV first. Local XLSX parsing can be added in a later release.
Are the files uploaded?
No. The browser FileReader reads them on your device.