CSV Analyzer
Upload or paste CSV/TSV files and get instant per‑column statistics—counts, unique values, nulls, and numeric min/max—entirely in your browser.
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Start Analyzing CSV Files
Get instant column stats and export a concise report
Load Data
Summary
Column Statistics
How to Use CSV Analyzer
- 1
Import CSV or TSV
Upload a .csv/.tsv file or paste data directly. The analyzer auto-detects delimiters but you can switch between comma, tab, semicolon, or pipe.
Tip:Clean headers first for best results; prefer consistent casing and no spaces. - 2
Verify Headers & Delimiter
Confirm the header row and check the delimiter setting. Adjust if columns look misaligned or quoted fields appear split.
Tip:If your data contains commas inside quotes, keep auto-detect or set comma explicitly. - 3
Review Column Statistics
Inspect per-column stats: total rows, non‑null values, nulls, unique counts, and min/max for numeric or length ranges for text.
Tip:Use unique counts and nulls to spot keys, sparsity, and potential data quality issues. - 4
Export Findings
Download a CSV summary of your analysis for documentation, QA, or to share insights with your team.
Tip:Keep this report in your PR or issue for traceability of dataset assumptions.
Security & Privacy
- Analysis runs entirely in your browser; files never leave your device.
- No data is uploaded, logged, or stored.
- Very large CSVs may affect performance — sample or split before analysis.
Common Pitfalls
- Quoted commas can split columns if delimiter is forced incorrectly.
- Mixed header casing makes joins harder — normalize headers first.
- Large files may be slow — sample or split before analysis.
Features & Benefits
Instant Column Stats
Counts, unique values, nulls, and per-column distributions at a glance.
Numeric Min/Max
Auto-detect numeric columns and compute min/max for quick sanity checks.
Automatic Delimiter Detection
Automatically detects tab/comma; supports semicolon and pipe as well.
Upload or Paste
Analyze local files or paste raw CSV/TSV directly into the tool.
Exportable Report
Download a concise CSV report of your results for reviews and audits.
Privacy‑First
Runs entirely in your browser—no uploads or external processing.
Frequently Asked Questions
Is my file uploaded anywhere?
No. All analysis runs locally in your browser. Files never leave your device.
Which delimiters are supported?
Auto‑detect covers comma and tab by default. You can also choose semicolon or pipe explicitly.
How are min/max computed?
For numeric columns we compute numeric min/max. For text columns we show min/max string length across unique values.
Does it handle quoted fields?
Yes. The parser respects quotes so commas inside quotes do not split columns.
What is the row limit?
Designed for typical CSVs used in day‑to‑day workflows. Very large files may be slower depending on your device.
Can I export results?
Yes. Download a CSV report summarizing per‑column stats for documentation or sharing.
Technical Specifications
Use Cases & Applications
Data Quality Checks
Assess null rates, uniqueness, and ranges before importing into a database.
Schema Discovery
Identify candidate keys and numeric columns quickly when exploring new datasets.
Pre‑ETL Inspection
Validate assumptions and catch anomalies before running transformations.
Analytics Prep
Confirm column types and value distributions prior to dashboarding.
Bug Reproduction
Attach a compact analysis report to issues for faster triage.
Review & Compliance
Share column statistics during reviews to document data handling.