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Free online SQL formatter — format and minify SQL queries for better readability. Supports MySQL, PostgreSQL, SQLite and major SQL dialects.
SQL (Structured Query Language) is the standard language for managing relational databases. Well-formatted SQL queries are easier to read, debug, and maintain. A consistent formatting style is especially important in team environments where multiple developers work with the same queries and codebase.
Formatted SQL uses consistent indentation, line breaks, and casing to make the query structure visually clear. Keywords like SELECT, FROM, WHERE, JOIN are typically capitalized. Column lists are indented and often placed on separate lines. Subqueries and JOIN conditions are indented to show their nesting level.
Minified SQL removes all unnecessary whitespace — useful for reducing query size in application code, logging, or when sharing queries in constrained environments like chat messages. However, minified queries should never be used for development or debugging since they sacrifice readability.
Good SQL formatting practices include: capitalizing SQL keywords, putting each major clause on a new line, indenting column lists and conditions, using meaningful table aliases, and keeping line length reasonable. Consistent formatting makes code reviews easier and helps catch logical errors.
This formatter supports standard SQL syntax and can handle complex queries with JOINs, subqueries, CTEs (WITH clauses), window functions, and aggregations. It uses the sql-formatter library which is compatible with MySQL, PostgreSQL, SQLite, and other major database dialects.
Different database vendors have subtle syntax differences that affect formatting. MySQL uses backticks for identifiers, PostgreSQL uses double quotes, and SQL Server uses square brackets. JOIN syntax also varies — some dialects support NATURAL JOIN, CROSS JOIN, or lateral joins. A good formatter respects these dialect-specific conventions, ensuring the output is not just pretty but syntactically appropriate for your target database.
No. Formatting only changes whitespace and casing — the database parses the same query structure regardless. However, well-formatted queries are easier to optimize because the logic is clearer to the developer.
There is no single best style — consistency matters more than specific rules. Popular styles include: Allman (keywords on their own line), compact (shorter queries fit in fewer lines), and tabular (aligning similar elements vertically). Pick one style and use it consistently.
This tool focuses on SQL query formatting (SELECT, INSERT, UPDATE, DELETE, CREATE TABLE). For formatting full stored procedures with PL/SQL or T-SQL blocks, consider a more specialized SQL formatter.
Each vendor uses different identifier quoting — MySQL uses backticks, PostgreSQL uses double quotes, SQL Server uses square brackets. CASE statement syntax, LIMIT/TOP clauses, and function names also vary. A good formatter recognizes these differences and applies correct formatting per dialect to avoid syntax errors when running the formatted query.
Format SQL in your application code before logging or storing queries for debugging. Never rely on the database to format queries — databases focus on execution, not presentation. Use formatters as part of your linting pipeline so that all SQL in your codebase follows consistent style rules.