Data Quality Checker

Professional data quality analysis tool for CSV and JSON files with comprehensive statistics calculation, duplicate detection, data type validation, missing value analysis, and data profiling. Features include outlier detection, data distribution analysis, and detailed quality reports for data cleaning and preparation workflows.

Duplicate Detection Data Profiling Missing Value Analysis Outlier Detection

Supported Formats

duplicates 5 duplicate rows found

missing Column 'age': 12% missing

outliers 3 outliers detected in 'price'

Drag & Drop Ready

1. Upload Data: Load CSV or JSON files or paste data directly

2. Automatic Analysis: Tool analyzes data types, duplicates, and statistics

3. Review Results: Check quality metrics, outliers, and missing values

4. Data Profiling: View detailed statistics and distribution analysis

5. Export Reports: Download quality assessment reports

Tip: Issue lines are visually highlighted in the editor

Data Source

Upload CSV File

Upload JSON File

Issue Highlighting

Duplicates

Validation

Outliers

Syntax

Quality Score

Overall Score

Completeness

Uniqueness

Validity

Consistency

Data Overview

Rows

Columns

Duplicates

Missing

Settings

Detect Outliers

Strict Duplicates

Email Validation

Date Validation

CSV Data Editor

Line Numbers Issue Highlighting

Paste CSV data with headers in the first row

Lines: 0 | Characters: 0 | Issues: 0

Help & Related Tools

Everything you need to know

FAQ Frequently Asked Questions

What data quality metrics does this tool analyze?

The tool provides comprehensive analysis including completeness, uniqueness, validity, and consistency scores. It detects duplicates, outliers, missing values, validates email and date formats, and provides detailed column statistics.

How do I upload and analyze my data?

Upload CSV or JSON files or paste data directly into the tool. Click "Analyze Data Quality" to get instant results. All processing happens in your browser - your data never leaves your device.

Does this tool work with large datasets?

The tool processes data entirely in your browser. Performance depends on your device capabilities. For optimal performance, we recommend datasets under 50,000 rows for smooth analysis.

Is my data secure when using this tool?

Yes, completely secure. All data processing happens locally in your browser. No data is uploaded to servers or stored externally. Your sensitive data remains private and secure.

Can I export the analysis results and cleaned data?

Yes! You can export detailed quality reports as JSON files and download cleaned data (with duplicates removed) as CSV files. Perfect for documentation and further data processing.