Free Online Column Data Profiler
Profile tabular datasets instantly with our free column data profiler. Analyze column stats, unique counts, and missing values securely in your browser.
About Column Data Profiler
Doffl's Column Data Profiler is a browser-based utility that delivers fast statistical summaries of your tabular data. Whether you are dealing with a messy CSV or verifying database exports, this tool inspects individual columns to surface key quality metrics like fill rates, unique value distributions, null frequencies, and data types.
Data analysts, developers, and QA engineers can audit dataset integrity without writing Python scripts or configuring heavy BI software. Your data processes locally on your device, ensuring sensitive records stay private while you evaluate data hygiene.
Key features
- Calculates missing, empty, and null value percentages
- Computes unique count and distinct value ratios
- Detects column data types automatically
- Generates statistical ranges for numeric columns
- Processes CSV, TSV, and delimited text inputs
- Runs locally in your browser for complete data privacy
How to use Column Data Profiler
- Upload your CSV or paste delimited data into the input field.
- Select or confirm the column delimiter used in your file.
- Click Profile to generate the statistical column summary.
- Review metrics including null counts, distinct values, and data types.
- Export the profiling summary report or inspect specific column anomalies.
Who is it for?
- Data engineers checking pipeline ingestion files for unexpected nulls or schema drift.
- Machine learning practitioners scanning feature columns before running model preprocessing.
- Spreadsheet users auditing large CSV exports that freeze standard office software.
- QA testers validating that export routines generate unique keys and expected value ranges.
Frequently asked questions
What is a column data profiler?
A column data profiler is a tool that analyzes structural quality across table attributes, calculating metrics like null counts, unique entries, value frequencies, and inferred data types.
Is my dataset uploaded to external servers?
No. The tool runs client-side in your web browser, meaning your data stays on your machine and is never transmitted or stored on Doffl servers.
What file formats does this data profiler support?
It supports standard delimited tabular files, including CSV (comma-separated), TSV (tab-separated), and pipe-delimited text exports.
Is the Column Data Profiler free to use?
Yes, the tool is completely free with no registration or account signup required for core profiling features.
How does it handle mixed data types within a single column?
The profiler scans all entries in the column and identifies type mismatches, flagging columns where numbers, strings, or dates conflict.