SQL Formatter

About this sql formatter

SQL queries written without proper formatting quickly become unreadable, especially when complex JOINs, nested subqueries, and CASE statements are involved. The SQL Formatter transforms messy, single-line SQL into beautifully formatted code that's easy to understand and maintain. Whether you're debugging legacy database queries, collaborating with your team, or preparing code for review, this free online SQL formatter works with all major database dialects—MySQL, PostgreSQL, SQLite, T-SQL, MariaDB, and standard ANSI SQL—making it the go-to solution for developers, data analysts, and database administrators worldwide.

Poorly formatted SQL isn't just hard to read—it's a liability. Complex queries with multiple levels of nesting, window functions, and CTEs become nearly impossible to maintain. Syntax errors hide in walls of text, performance bottlenecks go unnoticed, and debugging becomes a nightmare. The SQL Formatter solves this by not only beautifying your code with consistent indentation and proper keyword casing, but also validating syntax, identifying common mistakes, and providing detailed error explanations. Unlike basic formatters, this tool understands SQL semantics deeply, handling dialect-specific nuances for MySQL, PostgreSQL, SQLite, and T-SQL with precision.

Real-world development demands more than pretty formatting. Data warehouse engineers working with complex ETL SQL scripts need to understand query structure at a glance. Application developers writing application SQL statements benefit from consistent formatting across their codebase. The SQL Formatter handles it all—massive queries with dozens of tables, Common Table Expressions (CTEs), window functions, aggregate operations, and intricate WHERE clauses. The formatter respects dialect-specific syntax for each database system, ensuring your formatted query runs correctly whether it's optimized for MySQL performance, PostgreSQL features, SQLite constraints, or T-SQL stored procedures.

Performance optimization is built directly into the formatter. For SELECT queries, generate EXPLAIN plans that reveal execution strategy, highlighting missing indexes and suggesting performance improvements. Syntax highlighting shows you exactly what the formatter is doing in real-time, so you trust every change. Most importantly, all processing happens locally in your browser—your sensitive queries, proprietary SQL code, and database schema never leave your computer. Zero data transmission means zero privacy concerns, making this tool ideal for teams handling confidential financial, medical, or business-critical database queries.

Trusted by SQL developers, database engineers, and data science teams, the SQL Formatter eliminates hours of manual formatting work while ensuring consistency and correctness. Whether you're standardizing code style across your database layer, onboarding new team members, preparing queries for code review, or simply trying to understand someone else's convoluted SQL, this free tool delivers professional-grade formatting and validation in seconds.

How to use this tool

1. 01

   Paste Your SQL Query

   Copy and paste your SQL code into the input area. The formatter accepts queries of any size and complexity, from simple SELECT statements to enterprise-grade queries with multiple tables, JOINs, CTEs, window functions, and subqueries.

2. 02

   Select Your Database Dialect

   Choose your database system from the dropdown menu: MySQL, PostgreSQL, SQLite, T-SQL, MariaDB, or standard ANSI SQL. This ensures the formatter applies dialect-specific rules and syntax conventions appropriate for your database.

3. 03

   Review Formatted Output and Errors

   Instantly see your SQL beautifully formatted with consistent indentation and proper casing. The formatter highlights any syntax errors with clear explanations, making it easy to identify and fix issues before running the query.

4. 04

   Analyze Performance and Copy

   For SELECT queries, generate an EXPLAIN plan to understand execution strategy and identify optimization opportunities. Copy the perfectly formatted query to your clipboard and use it in your application or share with your team.

Worked examples

SELECT u.id, u.name, COUNT(o.id) as orders, SUM(o.total) as spent FROM users u LEFT JOIN orders o ON u.id = o.user_id LEFT JOIN order_items oi ON o.id = oi.order_id WHERE u.active = 1 AND u.created_at > DATE_SUB(NOW(), INTERVAL 90 DAY) GROUP BY u.id, u.name HAVING COUNT(o.id) > 0 ORDER BY spent DESC LIMIT 100;

SELECT
    u.id,
    u.name,
    COUNT(o.id) AS orders,
    SUM(o.total) AS spent
  FROM users u
  LEFT JOIN orders o ON u.id = o.user_id
  LEFT JOIN order_items oi ON o.id = oi.order_id
  WHERE u.active = 1
    AND u.created_at > DATE_SUB(NOW(), INTERVAL 90 DAY)
  GROUP BY u.id, u.name
  HAVING COUNT(o.id) > 0
  ORDER BY spent DESC
  LIMIT 100;

WITH ranked_sales AS (SELECT product_id, region, sales, ROW_NUMBER() OVER (PARTITION BY region ORDER BY sales DESC) as rank, DENSE_RANK() OVER (ORDER BY sales DESC) as global_rank FROM sales_data WHERE year = 2024) SELECT * FROM ranked_sales WHERE rank <= 5 ORDER BY region, rank;

WITH ranked_sales AS (
    SELECT
      product_id,
      region,
      sales,
      ROW_NUMBER() OVER (
        PARTITION BY region
        ORDER BY sales DESC
      ) AS rank,
      DENSE_RANK() OVER (
        ORDER BY sales DESC
      ) AS global_rank
    FROM sales_data
    WHERE year = 2024
  )
  SELECT *
  FROM ranked_sales
  WHERE rank <= 5
  ORDER BY region, rank;

SELECT customer_id, CASE WHEN age < 18 THEN 'minor' WHEN age >= 18 AND age < 65 THEN 'adult' WHEN age >= 65 THEN 'senior' END as age_group, CASE WHEN purchase_total > 1000 THEN 'platinum' WHEN purchase_total > 500 THEN 'gold' WHEN purchase_total > 100 THEN 'silver' ELSE 'bronze' END as tier FROM customers WHERE active = 1;

SELECT
    customer_id,
    CASE
      WHEN age < 18 THEN 'minor'
      WHEN age >= 18 AND age < 65 THEN 'adult'
      WHEN age >= 65 THEN 'senior'
    END AS age_group,
    CASE
      WHEN purchase_total > 1000 THEN 'platinum'
      WHEN purchase_total > 500 THEN 'gold'
      WHEN purchase_total > 100 THEN 'silver'
      ELSE 'bronze'
    END AS tier
  FROM customers
  WHERE active = 1;

Limits and edge cases

• Syntax validation automatically detects errors in your SQL query according to your selected database dialect. Error messages explain exactly what's wrong and where, helping you fix issues quickly before running the query against your database.
• Complete privacy guarantee: all SQL formatting and validation happens entirely within your browser. Your queries are never transmitted to any server, stored in logs, or analyzed by third parties. Your sensitive database queries remain completely confidential and secure.
• The EXPLAIN plan feature (available for SELECT queries) shows how your specific database will execute your query, including table access methods and join strategies, revealing missing indexes and optimization opportunities to improve performance.

Standards and references