Profile CSV columns online — no upload

Profile every CSV column in one private browser scan, including types, missing values, numeric ranges, lengths, and honest distinct-value limits.

Profile one CSV file up to 200 MB entirely in your browser without uploading it. The report is read-only: it does not modify the CSV or create a cleaned copy. For each column it shows the inferred type, empty-value count, distinct count while that count is exact, numeric minimum, maximum, and mean for fully numeric columns, character-length range, and the most frequent values while exact distinct tracking is still available; mixed-type columns also show type confidence. If a column exceeds the selected exact-distinct limit, the report switches to a lower bound and stops showing top values for that column. Profiling scans one file at a time in a single streaming pass, so memory use is bounded by the number of columns and the selected distinct-tracking limit. The configured file limit includes a guard band below the measured workload.