SQL Formatter

MiniWebtool’s SQL Formatter reshapes a query for readability using a selected SQL dialect, indentation, and keyword case. Preview the formatted code with options for Standard SQL, MySQL, or PostgreSQL.

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Help me understand MiniWebtool's SQL Formatter: https://miniwebtool.com/sql-formatter/. What can I use it for, what inputs or settings do I need, and how do I use it and understand the output? Walk me through one simple example. Use this page as your source and answer in English.

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SQL FormatterTry it now — free ▼

⚡ Try an example:

SQL Dialect

Indentation

Uppercase Keywords

Preserve Comments

📝

Input SQL

✨

Formatted Output

Embed SQL Formatter Widget

About SQL Formatter

Welcome to the SQL Formatter, a powerful online tool that transforms messy, hard-to-read SQL queries into clean, properly indented code. Whether you are a developer, database administrator, or data analyst, this formatter helps you maintain consistent code style and improve readability across your SQL projects.

❌ Before (Messy)

SELECT u.name,u.email,o.total FROM users u INNER JOIN orders o ON u.id=o.user_id WHERE o.status='completed' ORDER BY o.created_at DESC

→

✓ After (Formatted)

SELECT u.name, u.email, o.total FROM users u INNER JOIN orders o ON u.id = o.user_id WHERE o.status = 'completed' ORDER BY o.created_at DESC

At a Glance

SQL Formatter reformats SQL queries with consistent indentation, line breaks and keyword case. It supports Standard SQL, MySQL and PostgreSQL, and the formatting runs in your browser.

SQL Formatter: features at a glance
Feature	What you get	Good for
SQL dialects	Choose Standard SQL, MySQL or PostgreSQL so dialect keywords such as AUTO_INCREMENT or RETURNING are handled correctly.	Queries written for a specific database
Indentation	Indent with 2 spaces, 4 spaces or tabs.	Matching a team's code style
Keyword case	Option to convert keywords such as SELECT, FROM and WHERE to uppercase.	Keeping keywords distinct from table and column names
Comments and strings	Inline (--) and block (/* */) comments are kept, and string literals and quoted identifiers are not changed.	Formatting commented queries without losing notes
Live preview	The formatted result with syntax highlighting updates as you type or paste, with undo and redo shortcuts.	Trying options and seeing the effect straight away
Copy or download	Copy the output to the clipboard or download it as a .sql file.	Moving cleaned queries into code or documents
Browser-only	Queries are formatted in your browser and are not sent to a server.	Queries with sensitive table or column names

Why Format SQL Queries?

SQL formatting is essential for maintaining clean, maintainable database code. Here's why it matters:

👁️

Improved Readability

Properly indented SQL with consistent keyword casing is much easier to read and understand at a glance.

🐛

Easier Debugging

When SQL is well-structured, it's easier to spot syntax errors, missing clauses, and logical issues.

👥

Better Collaboration

Teams can review and modify each other's queries more efficiently when everyone follows the same formatting standards.

📚

Code Maintenance

Consistent formatting makes it easier to maintain SQL code over time, especially in large projects.

Key Features

Multiple SQL Dialect Support

This formatter supports three popular SQL dialects:

Standard SQL: The ANSI SQL standard, compatible with most database systems
MySQL: Includes MySQL-specific keywords like AUTO_INCREMENT, ENGINE, SHOW, and more
PostgreSQL: Supports PostgreSQL-specific features like RETURNING, SERIAL, JSONB, and ON CONFLICT

Customizable Formatting Options

Tailor the output to match your coding standards:

Indentation: Choose between 2 spaces, 4 spaces, or tabs
Keyword Casing: Convert keywords to UPPERCASE or keep them lowercase
Comment Preservation: Keep inline comments (--) and block comments (/* */) intact

Real-Time Live Preview

See your formatted SQL instantly as you type or paste. No need to click buttons - the output updates automatically with every keystroke, giving you immediate feedback on how your formatting options affect the result.

Privacy-Focused Processing

All SQL formatting happens directly in your browser using JavaScript. Your queries are never sent to any server, ensuring complete privacy and security. This is especially important when working with queries that contain sensitive table names, column names, or data values.

How to Use the SQL Formatter

Paste your SQL: Enter your messy SQL query in the input panel on the left. You can paste directly from your code editor, database client, or any source.
Select your dialect: Choose Standard SQL, MySQL, or PostgreSQL from the dropdown to ensure dialect-specific keywords are handled correctly.
Configure options: Adjust indentation size, keyword casing, and comment handling according to your preferences.
View the result: The formatted SQL appears instantly in the output panel with syntax highlighting.
Copy or download: Use the Copy button to copy the result to your clipboard, or download it as a .sql file.

SQL Formatting Best Practices

Consistent Keyword Casing

Using uppercase for SQL keywords (SELECT, FROM, WHERE) and lowercase for table and column names (users, email) is a widely adopted convention that improves readability.

Logical Line Breaks

Each major clause should start on a new line. This makes it easy to scan the query structure and identify WHERE conditions, JOIN clauses, and other important elements.

Proper Indentation

Indent subordinate clauses and conditions to show their relationship to parent clauses. This hierarchical structure makes complex queries much easier to understand.

Comment Your Complex Logic

Add comments to explain non-obvious logic, business rules, or performance optimizations. Well-commented SQL is invaluable for future maintenance.

Supported SQL Statements

This formatter handles all common SQL statement types:

SELECT queries: Including complex JOINs, subqueries, CTEs (WITH clauses), and window functions
INSERT statements: Single and multi-row inserts, INSERT...SELECT, and UPSERT operations
UPDATE statements: Simple updates and complex updates with JOINs or subqueries
DELETE statements: Including DELETE with JOINs and subquery conditions
DDL statements: CREATE TABLE, ALTER TABLE, DROP, CREATE INDEX, and more
Transaction control: BEGIN, COMMIT, ROLLBACK, SAVEPOINT

Tips for Best Results

Handle Large Queries

For very large queries, the formatter processes efficiently in your browser. However, extremely complex queries with thousands of lines may take a moment to format.

Preserve String Contents

The formatter correctly preserves the contents of string literals (single quotes), identifiers (double quotes or backticks), and comments without modifying them.

Check Edge Cases

While the formatter handles most SQL syntax correctly, unusual or non-standard syntax might not format perfectly. Always review the output before using it in production.

Frequently Asked Questions

What is SQL formatting and why is it important?

SQL formatting is the process of restructuring SQL queries with proper indentation, line breaks, and consistent keyword casing to make them more readable. Well-formatted SQL is easier to understand, debug, and maintain. It helps teams collaborate more effectively and reduces the likelihood of errors when modifying complex queries.

Does this SQL formatter support different database dialects?

Yes, this SQL formatter supports multiple database dialects including Standard SQL, MySQL, and PostgreSQL. Each dialect has its own specific keywords and syntax that the formatter recognizes and handles appropriately. You can select your preferred dialect from the dropdown menu before formatting.

Is my SQL query data safe when using this formatter?

Absolutely. All SQL formatting happens directly in your browser using JavaScript. Your SQL queries are never sent to our servers or stored anywhere. This client-side processing ensures complete privacy and security for your database queries, even if they contain sensitive table names or data.

Can I customize the formatting options?

Yes, you can customize several formatting options including: indentation size (2 spaces, 4 spaces, or tabs), keyword casing (uppercase or lowercase), and whether to preserve inline comments. These options allow you to match your team's coding standards or personal preferences.

How does the live preview feature work?

The live preview feature formats your SQL query in real-time as you type or paste it. You can see the formatted result instantly without clicking any buttons. This immediate feedback helps you understand how your formatting options affect the output before copying or downloading the result.

Additional Resources

Reference this content, page, or tool as:

"SQL Formatter" at https://MiniWebtool.com/sql-formatter/ from MiniWebtool, https://MiniWebtool.com/

by miniwebtool team. Updated: Feb 03, 2026

Developer API available: Run this tool from your app, automation, or agent with one JSON HTTP request. View API docs

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