Can I convert large SQL files?

For optimal browser performance, we recommend SQL files under 1MB (approximately 5,000-10,000 lines). Large dump files with thousands of INSERT statements may cause slowdowns. For very large SQL files (over 10MB), consider using command-line tools like sqlformat, pgFormatter, or desktop applications designed for batch processing.

Does this tool store my SQL data?

No! All SQL processing happens entirely in your browser using JavaScript. Your SQL code and data are never uploaded to our servers or transmitted anywhere. This is especially important when working with production database schemas or sensitive data that shouldn't leave your local environment.

Are the converted formats reversible?

Some conversions are reversible while others are not. JSON can be converted back to SQL INSERT statements using our JSON to SQL tool. XML and YAML maintain structure but require manual conversion back to SQL. CSV loses schema information (data types, constraints). HTML tables are for display only and cannot be easily converted back to SQL.

What's the difference between Compress and Remove Comments?

Compress removes ALL unnecessary whitespace, newlines, and comments to create the smallest possible SQL string (useful for embedding in code). Remove Comments only strips comment blocks (/* ... */ and -- comments) while preserving formatting and readability. Use Compress for production deployment, Remove Comments for cleaning up documentation.

When should I convert SQL to JSON vs XML?

Use JSON for: modern web APIs, JavaScript applications, NoSQL databases, REST services, and when you need lightweight data interchange. Use XML for: legacy systems, SOAP web services, enterprise applications requiring schema validation (XSD), or when you need namespaces and metadata. JSON is generally preferred for new projects due to simplicity and smaller size.

Free Online SQL Formatter & Converter

Q: What SQL dialects are supported?

The tool supports standard SQL syntax common to most database systems including MySQL, PostgreSQL, SQLite, SQL Server, Oracle, and MariaDB. It handles CREATE TABLE, INSERT, SELECT, UPDATE, DELETE statements, JOINs, subqueries, and common SQL functions. Database-specific extensions may not be fully supported.

CREATE TABLE TOOLFK
(ID INTEGER PRIMARY KEY,
NAME VARCHAR(200));

INSERT INTO TOOLFK VALUES (1, 'Welcome to the [Toolfk.com] website. Please share it with your friends, thank you! ');
/* This is another comment
    On more than one line */
SELECT * FROM TOOLFK;

Supports CREATE, INSERT, SELECT, UPDATE, DELETE statements. Convert to XML, CSV, JSON, YAML, or HTML format.

What Is SQL Formatter?

SQL Formatter is a free online tool that cleans up and reorganizes your SQL code for better readability. Whether you're a database administrator, developer, or data analyst, messy SQL statements can hide logic errors and make collaboration harder. This tool automatically indents keywords, aligns clauses, and adds line breaks so your code becomes instantly understandable. You can also use it to compress SQL into a single line or convert your queries to other formats like JSON, CSV, XML, YAML, or HTML.

By handling formatting and conversion in one place, SQL Formatter saves you from switching between multiple utilities. It's ideal for preparing SQL for code reviews, embedding in documentation, or migrating data between systems. No registration, no file uploads—just paste your SQL and choose your desired output. The tool runs entirely in your browser, keeping your data private and secure.

Key Features

Beautify SQL code with automatic indentation, keyword capitalization, and proper line spacing for maximum readability.
Compress SQL queries into a single line to save space or prepare for inline use in scripts.
Convert SQL to multiple formats including JSON, CSV, XML, YAML, and HTML table markup.
Support for major SQL dialects such as MySQL, PostgreSQL, SQL Server, Oracle, and SQLite.
Instant preview of formatted or converted output, with one-click copy to clipboard.
Zero dependencies – works entirely in your browser with no data sent to a server.

How to Format SQL Online

Go to the SQL Formatter tool on ToolFK.
Paste your raw SQL code into the input text area.
Select your desired action: Format (pretty print) or Compress (minify).
Optionally choose a SQL dialect to improve keyword recognition.
Click the Convert button to process your code.
Copy the output by clicking the clipboard icon or download it as a text file.

Best Use Cases

Code review preparation – Format messy queries before sharing with teammates to highlight logic issues.
Documentation & wikis – Convert SQL examples into HTML tables or Markdown-ready code blocks.
Data migration – Export SQL query results as CSV or JSON for import into analytics tools or other databases.
Query debugging – Beautify complex nested SELECT statements to trace joins and subqueries visually.
Learning SQL – Paste sample queries to see how consistent formatting improves understanding.

Related Tools

Frequently Asked Questions

Can I use SQL Formatter for large queries?

Yes, the tool handles queries of several thousand characters without performance issues. However, extremely large scripts (over 100 KB) may take a few seconds to process. For production databases, it's recommended to test on a subset first. The tool works entirely in-browser, so there are no server limits on file size.

Does it support converting SQL to JSON arrays of objects?

Yes. When you choose "Convert to JSON," the tool expects a SELECT statement and outputs an array of objects where each row becomes an object with column names as keys. This is perfect for feeding SQL results into REST APIs or JavaScript applications. You can also customize the output format within the JSON structure.

Will formatting change the logic of my SQL queries?

No, formatting only modifies whitespace, indentation, and capitalization—never the actual SQL commands or data values. The tool preserves comments, strings, and special characters. You can safely run formatted SQL in your database without worrying about unintended side effects.

What SQL dialects are supported?

SQL Formatter recognizes syntax for MySQL, PostgreSQL, Microsoft SQL Server, Oracle, SQLite, and standard ANSI SQL. Choose the dialect from the dropdown to improve keyword matching for functions like GETDATE() (SQL Server) or NOW() (MySQL). If unsure, select "Standard SQL" for general use.

How do I compress SQL for embedding in code?

Select the "Compress" action instead of "Format." The tool will remove all unnecessary spaces and line breaks, producing a dense one-line string. This is useful for inserting SQL into Java, Python, or JavaScript strings where whitespace isn't needed.

Can I convert SQL to HTML tables for a website?

Absolutely. Choose "Convert to HTML" and the tool generates a clean <table> structure with column headers and data rows. You can copy the HTML directly into your web page or CMS. The output is responsive and includes basic CSS classes for styling.

Last updated: July 1, 2026