SQL Formatter

The online SQL formatter converts messy or minified SQL into a consistent, readable form. Primary users include developers, DBAs, data engineers, and students who frequently write or review SQL and want reliable formatting before code reviews, documentation, or sharing. It defaults to ANSI SQL but can adapt to common dialects such as MySQL, PostgreSQL, and T-SQL. The formatter preserves comments and string literals, enforces deterministic indentation, and applies consistent keyword casing. It aims to improve readability, reduce cognitive load, and minimize formatting disputes across teams.
Conceptually, the tool tokenizes input, classifies tokens, and uses a pretty-printer to place each clause on its own line with clear indentation. It formats SELECT, FROM, WHERE, GROUP BY, and ORDER BY blocks, aligns operators and keywords, and reflows long lines within a wrap limit. Core capabilities include syntax-aware parsing, comment preservation, and safe handling of nested subqueries. Optional enhancements include dialect-specific presets, customizable indentation size, and user-defined keyword lists to enforce project standards.
Typical use cases include preparing SQL for code review, onboarding new teammates, sharing samples in documentation, and validating legacy queries after migrations. Unique differentiators are dialect awareness, non-destructive formatting that preserves semantics, and configurable style presets that produce consistent outputs across repositories. Outputs include the formatted SQL and a lightweight summary with line and token counts to aid reviewers and CI checks.