DB Fiddle
db-fiddle.com
Run a schema and a query against real MySQL, Postgres or SQLite
No sign-up
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shell.duckdb.org
Run SQL over your own CSV or Parquet file without uploading it.
DuckDB compiled to WebAssembly, running as a terminal in the page. Drag a CSV, Parquet or Arrow file onto it and the file becomes a queryable table immediately, so you can answer a question about a 200 MB export with a `GROUP BY` instead of waiting for a spreadsheet to open it. It can also query a Parquet file straight from a URL. There is no chart output and no saved state — close the tab and the session is gone.
Questions
Works the moment the page loads. No account, no email, no trial. Nothing persists between sessions, and very large files are limited by the browser's available memory.
No. DuckDB Web Shell does the work inside your browser, so the file never leaves your device — you can load the page, disconnect from the network, and it still works. That makes it a reasonable choice for material containing personal data.
Nothing persists between sessions, and very large files are limited by the browser's available memory.
Alternatives
Same category or same task, ordered by how closely they overlap.
db-fiddle.com
Run a schema and a query against real MySQL, Postgres or SQLite
mockaroo.com
Generates realistic fake test data in CSV, JSON or SQL
tableconvert.com
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datablist.com
Spreadsheet built for cleaning and deduplicating messy list exports
datasetsearch.research.google.com
Finds published datasets across repositories, governments and journals
ourworldindata.org
Long-run global data on health, energy and poverty, free to reuse