Data profiler — summarise a CSV's columns
Profile each column of a CSV: type, counts, nulls, distinct values and number ranges. It runs entirely in your browser (0 uploads, works offline).
How to use it
- Paste your CSV.
- Read the per-column profile.
- Copy or Download the report.
FAQ
How do I profile a dataset for free?
Paste the CSV and this page infers each column's type and reports the count, nulls, distinct values and, for numbers, the min, max and mean — on your device with no upload.
Is my data uploaded anywhere?
No. Profiling runs entirely in your browser and nothing is transmitted or stored, which you can verify by turning off your Wi-Fi.
What does it tell me?
A quick data-quality snapshot: which columns are numeric, how many values are missing, how many are unique, and the range of numeric columns.
Why profile data?
To spot problems — unexpected types, missing values, low-cardinality columns — before you analyse or import the data.
Limits
Profiles the columns you paste; it does not detect correlations or draw charts.
Related
The column statistics tool focuses on one column; the CSV cleaner fixes issues.
Bookmark this page (Ctrl+D, or ⌘D on Mac) or install the app — it works offline the next time you need it.