When to use Local SQL Lab?
Query a CSV, JSON or Parquet file locally with an analytical SQL engine without importing data to a server.
- Filter a large business export
- Calculate ad hoc aggregates
- Explore Parquet without installing Python or a DBMS
Spreadsheets & data · ONLINE TOOL
Local SQL Lab
Build SQL visually, filter, group, sort, revisit session queries and export checked results as CSV or Parquet.
Local processingNo account required
CONCRETE EXAMPLE
CSV → local SQL
BEFORE
→activity_export.csv
AFTER
SELECT team, count(*) FROM data GROUP BY team + CSV/Parquet export
Your data stays in the browser
Processed content is not uploaded to WorkToolset. Required libraries may be loaded by the site, but the file stays in the browser.
Limitations to know
- DuckDB-WASM is downloaded on first use.
- This surface is intentionally read-only and caps exports to protect browser memory.
A straightforward workflow.
- 1Prepare the required input and choose useful options.
- 2Review previews, warnings and limitations before export.
- 3Download a new copy or report: the original stays unchanged.
Frequently asked questions
Are my files uploaded to WorkToolset?
No. This tool runs locally in your browser.
Is my original file modified?
No. WorkToolset creates a new copy or export.
Do I need an account?
No for this free tool. Accounts are mainly used for favorites, presets and future workflows.