The best free Online SQL Formatter — format SQL in MySQL, PostgreSQL, SQLite, MSSQL and Oracle dialects, validate syntax, generate code snippets, and use AI to explain, optimize or generate SQL queries. Fast, private, and works entirely in your browser.
Formatted SQL will appear here…About SQL Formatter
The best free Online SQL Formatter — format SQL in MySQL, PostgreSQL, SQLite, MSSQL and Oracle dialects, validate syntax, generate code snippets, and use AI to explain, optimize or generate SQL queries. Fast, private, and works entirely in your browser.
Frequently Asked Questions
Is this the best free SQL formatter online?
CalcNation SQL Formatter offers more features than most free tools — dialect auto-detection, AI explain/optimize/generate, code snippet generation for 3 languages, multi-query support, table extraction, complexity analysis, and full keyboard navigation. All completely free.
Does it work without installation?
Yes. 100% browser-based. No download, no install, no account required. Open the page and start formatting immediately.
Which SQL dialects are supported?
MySQL, PostgreSQL, SQLite, Microsoft SQL Server (MSSQL), and Oracle SQL. Dialect auto-detection identifies which dialect your query uses based on specific keywords.
Can AI generate SQL from a description?
Yes. Click AI → Generate, describe what you want in plain English (e.g., "Get top 10 customers by revenue in the last 30 days with their order count"), and Claude AI generates the appropriate SQL in your selected dialect.
Is my SQL data private?
Your SQL never leaves your device for formatting, validation, or analysis — all these operations run in the browser. AI features send the query text to the AI API for processing, but nothing is stored or logged on CalcNation servers.