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The data engineer's
free toolbox.
Inspect, model, and debug your data files — no upload, no account, no waiting on a server. Built by the team behind the Petascale Labs curriculum, so each tool teaches the internals while it works.
events.parquet · 4 columns · 1,248 rows
| user_id | event | ts | amount |
|---|---|---|---|
| u_8821 | checkout | 12:04:11 | $129.00 |
| u_1043 | view | 12:04:12 | — |
| u_9920 | add_cart | 12:04:14 | $42.50 |
| u_3372 | checkout | 12:04:19 | $8.99 |
SNAPPY · ZSTD · row-group ✓read locally
Storage
Parquet Viewer
View a Parquet file's schema, metadata & data — and get prod best-practice fixes.
Free · in-browserOpen→
Modeling
SCD Playground
Watch a dimension transform under SCD Types 0/1/2/3/4/6 — plus fact-joins, time-travel, an anti-pattern advisor & bitemporal.
Free · in-browserOpen→
Governance
PII Masking Policy Generator
Auto-detect PII in a sample, pick a technique, and generate Snowflake / Databricks / BigQuery masking DDL.
Free · in-browserOpen→
Go deeper than the tool
Every finding links to the lesson that teaches the internals. The full Parquet deep-dive lives in the curriculum.