What SQL dialects are supported?

The SQL Formatter supports six major dialects: Standard SQL, PostgreSQL, MySQL, SQLite, T-SQL (Microsoft SQL Server), and PL/SQL (Oracle). Each dialect has its own syntax nuances and reserved words. Select your dialect from the dropdown to ensure dialect-specific formatting. If you’re unsure which to choose, Standard SQL works for most general-purpose queries.

Does it validate SQL syntax?

The tool performs a basic syntax check — it validates that parentheses are balanced and that at least one SQL keyword (SELECT, INSERT, UPDATE, DELETE, CREATE, etc.) is present. This catches common mistakes like missing closing brackets, but it is not a full SQL parser. For complete syntax validation, test your query against your actual database engine.

Can it format multiple statements?

Yes. If your input contains multiple SQL statements separated by semicolons, the formatter will process all of them. You can control how many blank lines appear between formatted statements using the "Lines Between" selector, with options from 0 to 3 blank lines.

Does it preserve comments?

Yes, both line comments (-- single line) and block comments (/* multi-line */) are preserved in the formatted output. Comments are placed on their own lines where appropriate, maintaining readability while keeping them associated with the code they describe.

What formatting options are available?

You can control three main formatting aspects: keyword case (Uppercase, Lowercase, or Preserve original), indentation style (2 spaces or tab characters), and the number of blank lines between multiple statements. These options let you match your team’s SQL style guide or adapt to different project conventions.

Yes. Click the "Minify" button to strip all unnecessary whitespace from your SQL query, producing the most compact single-line representation. This is useful for reducing query size when embedding SQL in application code, configuration files, or network payloads. The minified output maintains valid SQL syntax.

What’s the maximum query size?

There is no hard limit on query size. Since all processing happens in your browser, the practical limit depends on your device’s available memory. In testing, queries of 10KB and larger format without issues. Very large queries (100KB+) may take a moment to process but should work fine.

Does it work on mobile?

Yes. The SQL Formatter is fully responsive and works on mobile phones, tablets, and desktop computers. On smaller screens, the input and output editors stack vertically instead of side-by-side. All features — formatting, minifying, dialect selection, copy, and download — work on mobile devices.

🛠️DevToolsHub

SQL Formatter

Format and beautify SQL queries with syntax highlighting.

What is SQL Formatter?

SQL (Structured Query Language) is the universal language for interacting with relational databases. Whether you’re writing a simpleSELECTstatement or a complex multi-page analytical query with subqueries, joins, and window functions, the structure of your SQL matters. Poorly formatted SQL is hard to read, difficult to debug, and a nightmare to review in pull requests. A SQL Formatter takes your raw, compact, or inconsistently styled SQL and transforms it into clean, properly indented, and readable code.

Formatting SQL is about more than just aesthetics. When queries are well-structured, you can spot missing joins, identify incorrect conditions, understand nested subqueries, and trace the logic of complex analytical queries at a glance. In team environments, consistent SQL formatting ensures that every developer writes queries in the same style, reducing cognitive load during code reviews and making it easier to maintain shared codebases. Formatted SQL is also dramatically easier to debug — when an error message references a specific clause, properly formatted queries let you find it instantly.

DevToolsHub’s SQL Formatter supports six major SQL dialects: PostgreSQL, MySQL, SQLite, Standard SQL, T-SQL (Microsoft SQL Server), and PL/SQL (Oracle). Each dialect has its own syntax nuances, reserved words, and formatting conventions. The formatter automatically handles dialect-specific keywords, functions, and operators, ensuring that your formatted SQL is not only readable but also syntactically appropriate for your database engine.

Beyond formatting, the tool also includes a minifymode that strips all unnecessary whitespace — useful for reducing query size when embedding SQL in application code or configuration files — and a basic syntax validator that checks for balanced parentheses and the presence of SQL keywords. Everything runs entirely in your browser with no server round-trips, so your queries never leave your machine.

Common use cases include: formatting minified SQL extracted from application logs, beautifying queries before adding them to version control, preparing SQL for code review, learning SQL by seeing properly structured examples, converting between keyword casing conventions (uppercase for keywords is the most common standard), and compressing SQL for inline use in stored procedures or application code. Whether you’re a database administrator, backend developer, data analyst, or student learning SQL, a reliable formatter is an indispensable part of your toolkit.

How to Use SQL Formatter

Paste or type your SQL queryinto the input editor on the left. You can also click “Load Example” to see how it works with a sample query containing joins, grouping, and aggregation.
Select your SQL dialect from the dropdown at the top right. Choose between Standard SQL, PostgreSQL, MySQL, SQLite, T-SQL, or PL/SQL to ensure dialect-specific formatting.
Choose formatting options— set keyword case (Preserve, Uppercase, or Lowercase), indentation style (2 spaces or tab), and the number of blank lines between multiple statements.
Click Format to beautify your query, orMinifyto strip all whitespace. The tool auto-formats on input change with a 500ms debounce, so you’ll see results update automatically as you type.
Review the output in the right-hand editor. If there are syntax issues (unbalanced parentheses, missing keywords), the error panel will describe the problem.
Copy or downloadthe result using the buttons below the output editor. The downloaded file will be saved as “download.sql”.

Supported SQL Dialects

Standard SQL— Generic SQL formatting that works across most database engines. Uses the SQL:2008 standard as a baseline.
PostgreSQL— Formats queries for PostgreSQL, including support for PostgreSQL-specific syntax likeRETURNING,ILIKE, and array operators.
MySQL— Tailored for MySQL and MariaDB, handling MySQL-specific functions, backtick identifier quoting, and unique syntax patterns.
SQLite— Optimized for SQLite’s SQL dialect, which has its own set of supported functions and pragma statements.
T-SQL (SQL Server)— Microsoft’s Transact-SQL extension, including support forTOP,DECLARE, and other T-SQL specific constructs.
PL/SQL (Oracle)— Oracle’s procedural SQL extension, handling PL/SQL blocks, cursors, exceptions, and Oracle-specific functions.

Formatting Options

Keyword Case— Control how SQL keywords are rendered. Uppercase converts all keywords toUPPER CASE(the most common convention). Lowercase converts them tolower case.Preserve keeps the original casing from your input.
Indentation— Choose between 2-space indentation (the default and most popular style) or tab characters. Indentation applies consistently to all nested clauses and subqueries.
Lines Between Queries— When formatting multiple statements separated by semicolons, control how many blank lines appear between each statement. Options range from 0 (no blank lines) to 3.
Minify Mode— Strips all unnecessary whitespace from your SQL, producing the most compact single-line representation. Useful for embedding queries in application code or reducing payload size.

Features

Six SQL dialects— PostgreSQL, MySQL, SQLite, Standard SQL, T-SQL, and PL/SQL are all supported with dialect-aware formatting.
Syntax highlighting— Color-coded SQL output with keywords, strings, numbers, and comments visually distinguished.
Keyword case control— Convert keywords to uppercase, lowercase, or preserve the original casing from your input.
Multiple indent styles— Choose between 2-space indentation or tab characters to match your team’s coding standards.
Minify mode— Compress SQL queries by removing all unnecessary whitespace while maintaining valid syntax.
Basic syntax validation— Checks for balanced parentheses and the presence of SQL keywords, providing instant feedback on common syntax errors.
Comment preservation— Both line comments (-- comment) and block comments (/* comment */) are preserved in the formatted output.
Multiple statement support— Format multiple SQL statements separated by semicolons in a single operation, with configurable spacing between them.
100% client-side (privacy-first)— All formatting happens in your browser. Your SQL queries are never sent to a server, making it safe to use with sensitive or proprietary database queries.
Auto-format on input— The output updates automatically as you type, with a 500ms debounce to avoid excessive reformatting.
Copy and download— One-click copy to clipboard or download as a .sqlfile for use in your projects.

Example

Here’s how the SQL Formatter transforms a compact, single-line query into a readable, well-structured statement:

Before (minified)

After (formatted)

Each clause is on its own line, columns in the SELECT list are individually indented, join conditions are clearly separated, and the overall logic of the query is immediately apparent — all without changing a single character of the actual SQL logic.

Frequently Asked Questions