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How SQL Formatter & Prettifier works
The SQL Formatter and Prettifier formats minified, messy, or unformatted database queries into clean, standardized, and readable SQL scripts. Powered by sql-formatter, the tool provides robust parsing across multiple SQL dialects including Standard ANSI SQL, PostgreSQL, MySQL, SQLite, Transact-SQL (T-SQL), and PL/SQL.
Clean SQL formatting is essential for debugging complex database queries, optimizing query plans, conducting code reviews, and maintaining consistent standards across engineering teams. The formatter handles multi-level subqueries, nested JOIN clauses, window functions, and CASE statements with customizable indentation and keyword casing.
Developers can toggle between 2-space, 4-space, or tab indentation, enforce uppercase or lowercase keyword casing, minify queries for production payloads, and export clean .sql files directly from the browser without sending proprietary database queries to third-party servers.
How to use SQL Formatter & Prettifier
1. Paste Raw SQL Query
Enter your unformatted, minified, or single-line SQL query into the left input console or click Load Sample.
2. Select SQL Dialect
Choose your database dialect (Standard SQL, PostgreSQL, MySQL, SQLite, T-SQL, PL/SQL) for dialect-specific syntax.
3. Customize Formatting Style
Select keyword casing (UPPERCASE, lowercase, preserve) and choose your preferred indentation width.
4. Copy or Download Formatted SQL
Copy the prettified SQL directly to your clipboard or download the formatted script as a .sql file.
Key features and technical specifications
Multi-Dialect Support
Dedicated syntax formatters for Standard SQL, PostgreSQL, MySQL, SQLite, Transact-SQL, and Oracle PL/SQL.
Keyword Casing Control
Enforce consistent UPPERCASE or lowercase casing across all SQL keywords, clauses, and built-in functions.
Built-in SQL Minifier
Strip comments, collapse extraneous whitespaces, and compact queries into single-line strings for API payloads.
Client-Side Security
Your confidential database queries and schema structure remain completely local in your browser sandbox.
Formatting does not validate database semantics
Indentation can make joins, conditions and nested queries easier to inspect, but it cannot prove that a referenced table exists or that a query returns the intended rows. Check the SQL dialect and use your database’s query plan and tests for performance or correctness decisions.
Database Developers & DBAs
Prettify complex stored procedures, multi-table JOINs, and migration scripts for clearer maintenance and code reviews.
Backend Engineers
Format query strings captured from application logs, ORMs (Prisma, Hibernate, Drizzle), and query profilers for quick debugging.
Data Analysts
Structure long analytical queries with CTEs (WITH clauses) and window functions into readable, documented scripts.
Frequently asked questions
Which SQL dialects are supported?
The formatter supports Standard ANSI SQL, PostgreSQL, MySQL, SQLite, Microsoft Transact-SQL (T-SQL), and Oracle PL/SQL with dialect-specific keyword mappings.
Does the formatter modify my query logic?
No. The formatter only adjusts whitespace, indentation, line breaks, and keyword casing. It never changes column names, table identifiers, or logical conditions.
Do I need an internet connection, and are my inputs uploaded?
An internet connection is required to open tools and refresh a temporary session. Processing stays on your device; the handshake sends a random challenge, not files or text inputs. Libraries, fonts or models may download. Local processing cannot remove risks from an untrusted device or extension.
Can I minify SQL queries for production?
Yes! Click the Minify button to remove all SQL comments and whitespace, creating an ultra-compact single-line query string ready for code integration.
Does the formatter support Common Table Expressions (WITH clauses)?
Yes. The formatting parser fully understands CTE syntax across modern SQL dialects, neatly indenting recursive and chained WITH clauses with isolated subquery blocks for maximum human readability.
Can I format SQL queries embedded inside ORM logs?
Yes! Simply copy the raw SQL output generated by Prisma, Hibernate, Drizzle, or Entity Framework into the editor. The formatter will strip extraneous quotation marks and format the underlying query cleanly.
How does the minifier handle single-line and multi-line comments?
The SQL minifier safely strips both standard ANSI double-dash (--) comments and C-style block (/* */) comments while preserving string literals, producing clean, compact queries optimized for network payloads.
Can I customize indentation spacing and keyword casing?
Yes. You can easily switch between 2-space, 4-space, or tab indentation, and enforce UPPERCASE or lowercase casing for SQL keywords with instant live preview updates.
How does the formatter handle subqueries and nested SELECT statements?
The formatter parses the AST to determine query depth, applying indentation levels and line breaks before FROM, WHERE, GROUP BY, and HAVING clauses within nested subqueries to ensure complete visual clarity across complex database logic.