Compare Arrow Files Online

How does the Arrow file comparison work?

The tool performs a full outer join on all columns. It reports rows that appear only in file A, only in file B, and rows that are identical in both files.

Do both Arrow files need to have the same columns?

Yes. Both files should have the same column names and compatible types for a meaningful comparison. If schemas differ, the join will still run but results may be misleading.

Can I compare large Arrow files with many rows?

Yes, within your device's available RAM. The tool handles large set operations efficiently using optimised in-browser processing.

Is my data private?

Yes — completely. Your file is never uploaded to any server. Everything runs locally in your browser using WebAssembly — processing happens entirely inside your tab. Once you close the tab, nothing is retained.

What is the maximum file size?

The free limit is 50 MB. For larger files, performance depends on your device's available memory — most modern machines handle 500 MB to 1 GB comfortably.