SQL Formatter guide
SQL Formatter Description
A professional tool to prettify, format, and minify SQL queries. Supports multiple SQL dialects to ensure your code is readable and maintainable.
Features
SQL Beautification: Automatically indents keywords and aligns clauses for maximum readability.
Dialect Support: Compatible with MySQL, PostgreSQL, MariaDB, and standard SQL.
Minification: Compress SQL queries by removing whitespaces and comments for production use.
Comment Cleanup: Option to 'Purge' comments to get a clean code version.
How to Use
1
Paste your raw or messy SQL query into the editor.
2
Click the Example (Demo) button to see how a complex
SELECT statement is formatted. 3
Click Format to beautify the code with proper indentation.
4
Click Minify to compress it into a single line.
5
Click Purge if you want to remove all SQL comments.
FAQ
Q. Does it validate my SQL syntax?
It primarily focuses on formatting; however, extremely malformed SQL might lead to suboptimal formatting results.
Q. Can it handle subqueries?
Yes, it correctly identifies and indents nested subqueries and joins.
Use Cases
- Code Review: Cleaning up auto-generated SQL from ORMs to make it human-readable.
- Database Debugging: Formatting long, nested queries to easily spot logical errors.
- Documentation: Preparing clean SQL snippets for technical guides or team wikis.
Technical Deep Dive
The tool uses a specialized SQL lexer to tokenize keywords (SELECT, FROM, JOIN, etc.) and literals. It then reconstructs the query using a rules-based layout engine that handles indentation levels and line breaks.
Limitations
- Some non-standard proprietary database extensions might not be perfectly formatted if they diverge significantly from standard SQL syntax.
3M
Reviewed by Tool3M Editorial Team
Updated April 25, 2026