CSV & Parquet Dataset Viewer — Tech Help Tools
Drag & drop your file here or browse
All processing occurs strictly inside your browser. No files are uploaded to any server.
Client-Side CSV & Apache Parquet Explorer
A modern, privacy-first dataset inspector designed for data engineers, data scientists, and analysts. Inspect complex columnar schemas, sort millions of cell values, filter subsets, and export data without server uploads.
100% Client-Side Privacy
No confidential databases, customer CSVs, or internal parquet partitions are sent over the network. Everything executes locally in your browser sandbox.
Automatic Schema & Type Detection
Detects strings, numbers, booleans, timestamps, and nested objects. Columns are assigned appropriate filters (numeric sliders, text matchers, date range pickers).
High-Performance AG Grid
Virtual DOM rendering provides butter-smooth scrolling, multi-column sorting, floating filter bars, quick search, and custom pagination for up to 100MB files.
Instant CSV & JSON Export
Clean, slice, or inspect your parquet files and export the processed tabular data directly to CSV or JSON formats with one click.
CSV vs Apache Parquet: Format Comparison
| Characteristic | CSV (Comma Separated Values) | Apache Parquet |
|---|---|---|
| Storage Format | Row-oriented, plain text | Columnar binary format |
| Compression | Uncompressed by default (requires external gzip) | Built-in per-column compression (Snappy, Zstd, Gzip) |
| Schema & Types | Untyped (everything is text unless parsed) | Explicit embedded schema with strict types |
| Best Used For | Small spreadsheets, simple exports, quick manual review | Data lakes, PySpark, DuckDB, big data analytics |
Frequently Asked Questions
Why is there a 100MB file limit?
Because this tool executes 100% inside your browser memory without a server, a 100MB raw file can unpack into several hundred megabytes of in-memory objects. The 100MB threshold guarantees your browser remains fast, responsive, and crash-free.
Can I view compressed Parquet files?
Yes. Our parser includes native WebAssembly and pure-JavaScript decompressors for Snappy, Zstandard (Zstd), Gzip, and Brotli compression codecs automatically.
Is my data private and secure?
Absolutely. No telemetry, rows, column headers, or file payloads are uploaded to any external server. You can inspect your browser's Network tab to verify that zero bytes leave your machine.
How do I sort by multiple columns?
Click any column header to toggle ascending/descending sort. Hold the Shift key while clicking additional columns to apply multi-column sorting.