This online PostgreSQL SQL formatter helps developers instantly clean up messy queries into readable, consistent SQL. It supports PostgreSQL syntax, highlights common anti-patterns such as SELECT * and implicit joins, and runs entirely in your browser without sending queries to a server.
This formatter performs static analysis only and does not execute SQL. The anti-pattern checks are heuristic and intended as guidance, not a substitute for query planning or professional review.
What this SQL Formatter is for?
This tool is designed for application developers, backend engineers, and database administrators working with PostgreSQL. It is especially useful when reviewing legacy queries, debugging performance issues, or preparing SQL for code reviews and documentation.
Well-formatted SQL improves readability, reduces review mistakes, and makes query plans easier to reason about. In PostgreSQL, explicit joins and explicit column lists also help avoid subtle performance and correctness issues.
PostgreSQL SQL Formatter
Formats SQL and flags common anti-patterns (heuristic). No data leaves your browser.
Shortcuts: Ctrl + Enter to format, Ctrl + L to clear input.
Input SQL
paste messy SQL here
Formatted SQL
copy or reuse
Anti-pattern Report
What this tool flags
SELECT *
Implicit joins (comma in FROM)
Missing WHERE on UPDATE/DELETE
SELECT DISTINCT *
CROSS JOIN without intent
You can extend the lint rules easily in the lintSql() function.
