CSV Diff Checker

Compare two CSV files row-by-row to find changes.

Free · Runs in your browser · Last updated 2026-05-03

Delimiter Key column (1-based) First row is header

About this tool

Diff two CSV files by a chosen key column and see which rows were added, removed or changed. Handles quoted fields and custom delimiters.

Privacy

All processing for CSV Diff happens locally inside your browser using JavaScript. Your input is never uploaded to a server, logged, or shared with third parties.

Frequently asked questions

Is the CSV Diff free to use?

Yes. CSV Diff is completely free for both personal and commercial projects. There are no usage limits, no sign-up, and no premium tier.

Is my data safe when I use CSV Diff?

All processing happens locally in your browser using JavaScript. Your input is never uploaded to our servers, logged, or shared with any third party.

Does CSV Diff work offline?

Once the page has loaded, the tool runs entirely client-side. You can disconnect from the internet and it will keep working in the same browser tab.

Which browsers are supported?

CSV Diff works in all modern browsers, including the latest versions of Chrome, Firefox, Safari, Edge, Brave, and Opera, on desktop and mobile.

Do I need to install anything?

No. CSV Diff runs in any modern web browser with no installation, browser extension, or account required.

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