The lab · SQL formatter

Make your SQL look like mine

Paste a query and it gets linted and fixed against my SQL style guide, by the real SQLFluff running entirely in your browser. Nothing is sent anywhere.

Dialect Snowflake Postgres BigQuery Redshift DuckDB Databricks ANSI Download the .sqlfluff config

Your SQL SELECT A.ID, A.NAME, COUNT(*), SUM(B.AMOUNT) TOTAL FROM ACCOUNTS A JOIN ORDERS B ON A.ID = B.ACCOUNT_ID WHERE A.STATUS = 'active' AND B.AMOUNT > 0 GROUP BY 1, 2

My SQL

Hit "Format it". The first run downloads Python and SQLFluff (~15 MB, then cached), so give it a few seconds.

How it works

Pyodide is CPython compiled to WebAssembly. The page boots it, installs SQLFluff from PyPI, then runs sqlfluff fix with the same .sqlfluff config you can download and use in your own projects. Anything SQLFluff can't fix on its own, like an aggregate with no alias, shows up as a note underneath.

The reasoning behind each rule is in the SQL style guide.