Compare Parquet files

Compare two Apache Parquet files — schema changes, row counts, and cell-level differences — entirely in your browser. Files never upload.

What it compares

• Schema changes — columns added, removed, or retyped between the two files.
• Row counts — the row total of each file and how many rows were compared.
• Cell-level differences — values that changed, compared positionally row by row.

Reading the result

Load a file into slot A and slot B. Identical files are reported as such; otherwise the schema diff, row counts, and the first changed cells are listed side by side.

How rows are compared

Rows are compared positionally — the first row of file A against the first row of file B, and so on. That keeps the comparison fast and predictable; note that if row order differs between the files, cells will show as changed even when the same logical records exist in both.

Private by design

Both files stay on your machine — the comparison runs locally in your browser.