▶ Free · Data Quality Check
See the quality of your data in seconds.
Drop a CSV or Excel file. Missing values, duplicate rows, mixed date and number formats, spelling variants like "İstanbul" vs "istanbul", and outliers, in one report.
Runs in your browser · your data is never sent to any server
Drop your file here
CSV, TSV or Excel (.xlsx, .xls) · up to 50 MB
▶ How it's calculated
- Four dimensions are scored: completeness (missing cells), uniqueness (duplicate rows), validity (values that don't match the column type) and consistency (mixed formats, spelling variants, leading/trailing spaces).
- Each dimension loses points at 5x the share of affected cells or rows: 2% affected costs 10 points, 20% or more scores 0. The overall score is the average of the four.
- A column's type is set by the majority of its filled values. Outliers are numbers more than 3 interquartile ranges outside the middle half.
- The first row is treated as the header. Analysis covers up to 200,000 rows; files are limited to 50 MB.
Let's read the result together.
In a short call we go through your result together and talk about where it makes sense to start. The "Let's talk about the result" button under the tool adds a summary of your result to the booking notes.
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