local / CSV profile / privacy-first
Profile CSV column quality locally.
Inspect blank values, distinct values, likely types, and duplicate headers in one view without uploading the CSV.
Choose a local CSV
Up to 10 MiB, 100,000 rows, and 500,000 cells. Quoted commas and newlines are supported.
Choose a CSV file. It is read only in this browser.
Column quality summary
Warnings
Compare with an expected schema
Use JSON such as { "columns": [{ "name": "id", "type": "integer", "required": true }] }. It is read only in this browser. Up to 200,000 bytes and 1,000 columns.
Choose an expected schema JSON to compare.
Schema differences
Boundaries
- Reading, profiling, and report saving happen locally. There is no upload, external request, or input storage.
- Types are visual candidates, not a guarantee of business meaning.
- Huge CSVs and unclosed quotes stop safely. The source data is not changed.