What is SQL Formatter?
SQL Formatter is a powerful online SQL query beautifier designed to transform unformatted, dense, or minified SQL queries into clean, standardized code. Complex database queries involving multiple JOINs, subqueries, Common Table Expressions (CTEs), and complex WHERE clause conditions quickly become difficult to maintain when unformatted. Our SQL Formatter automatically standardizes SQL keyword capitalization (e.g., SELECT, FROM, WHERE, GROUP BY, ORDER BY), aligns SQL clauses logically, and indents nested subqueries, significantly enhancing database script readability and developer collaboration.
How to use SQL Formatter
To format a SQL query, paste your raw database script into the editor area and select your target SQL dialect (Standard ANSI SQL, MySQL, PostgreSQL, SQLite, MS SQL Server, or Oracle). Click 'Format SQL' to apply the formatting rules instantly. The formatted script is rendered with syntax highlighting. You can customize formatting parameters, such as keyword capitalization style (uppercase vs lowercase) and tab/space indentation depth. Use the 'Copy' button to copy the formatted SQL or download it as a .sql file.
Key features
- Automatic SQL keyword uppercase/lowercase standardization
- Clause-level indentation and vertical alignment for SELECT, FROM, JOIN, and WHERE blocks
- Multi-dialect support including MySQL, PostgreSQL, SQLite, MS SQL Server, and Oracle
- Support for complex SQL features: CTEs (WITH clause), window functions, subqueries, and UNIONs
- Preserves embedded SQL comments (-- and /* */) during beautification
- Instant copy to clipboard and .sql file download
- 100% client-side security ensuring zero database credential or schema leaks
Common use cases
- Formatting complex auto-generated ORM queries from Hibernate, Prisma, TypeORM, or Entity Framework for analysis
- Cleaning up legacy database stored procedures and multi-page migration scripts
- Preparing clean SQL query snippets for developer documentation, code reviews, and pull requests
- Debugging slow database execution plans by visualizing subquery and JOIN hierarchies clearly
- Standardizing database script style rules across engineering teams
Technical details & standards
The formatting engine tokenizes the SQL input into keywords, identifiers, literals, operators, and clause delimiters. It builds an execution AST to correctly indent subqueries, align JOIN conditions, and manage CTE blocks (WITH clause) while respecting string literals and database object aliases. All SQL parsing and formatting executes completely in your client browser runtime. No database connections are opened, and no queries or confidential table column schemas are transmitted across the network, preserving strict database security.
Frequently asked questions
Does the SQL Formatter alter query execution logic?
No. The SQL Formatter alters only non-semantic whitespace, newlines, and keyword casing. The underlying logical structure, joins, filtering criteria, and table expressions remain 100% unchanged.
Are vendor-specific functions supported?
Yes. Common vendor functions in MySQL, PostgreSQL, SQLite, and T-SQL are recognized as identifiers and formatted appropriately.
Can it format queries with placeholders like $1, ?, or :param?
Yes! Parameter placeholders commonly used in prepared statements (e.g., ?, $1, :id) are preserved and aligned seamlessly within clauses.
Is my data safe?
All processing happens entirely in your browser. Your data never leaves your device and is never sent to or stored on a server.
Does it work offline?
Yes. Once the page has loaded, most tools keep working without an internet connection.