CSVFiddle is a free tool to explore and share insights from CSV files using SQL. You can import data, write SQL, then instantly share it with anyone. Everything runs 100% in-browser, so the data you import and the queries you write are never sent to a web server.

CSVFiddle querying is powered by DuckDB-Wasm, a WebAssembly implementation of the popular OLAP database, DuckDB. Any SQL you can run in DuckDB should be able to run in CSVFiddle. This means that you'll run into its quirks more often than you think.

The SQL editor features autocomplete for common SQL keywords/snippets and the table names/columns imported into a workspace. Click 'Share Workspace' in CSVFiddle to generate a link you can share with anyone. Queries and references to CSV data are encoded in the URL fragment, so the data are never sent to CSVFiddle servers.