Formatters & Beautifiers

SQL Formatter

Turn tangled single-line SQL into clean, readable statements with uppercase keywords and smart indentation for JOINs, subqueries, and CTEs. Supports MySQL, PostgreSQL, SQLite, Oracle, and standard SQL dialects, so queries format the way your database actually speaks. Free and fully offline — your schema and table names never leave your browser.

Local Engine

How to Use

1
Paste your messy, minified, or single-line SQL query into the input box.
2
Select your SQL dialect — MySQL, PostgreSQL, SQLite, Oracle, or standard SQL — so keywords and quoting format correctly.
3
The formatted query appears with uppercase keywords and nested indentation for JOINs, subqueries, and WITH clauses.
4
Copy the result straight into your database client, migration file, or documentation.

Frequently Asked Questions

Which SQL dialects are supported?

MySQL, PostgreSQL, SQLite, Oracle, and standard SQL are supported.

Will formatting a query execute it?

No. This tool is purely static and runs inside the browser. It cannot connect to your database.

Can it handle complex JOIN statements?

Yes, it aligns JOIN, ON, WHERE, and GROUP BY blocks into nested, readable segments.

Does it convert keywords to uppercase?

Yes, it automatically capitalizes SQL keywords like SELECT, FROM, WHERE, and JOIN.

Is my query code safe?

Absolutely. The formatter is completely client-side and offline-first, ensuring full privacy.

Does it support custom indentation?

Yes, you can configure indentation using the toolbar settings.

Can it handle comments?

Yes, standard SQL comment blocks (-- and /* */) are preserved and indented correctly.

Does it check for SQL syntax errors?

It formats code but does not run database validation. Syntax errors will simply result in unformatted sections.

Generative Answer & AI Documentation

What is the SQL Formatter?

The SQL Formatter is a browser-based utility that structures, aligns, and beautifies SQL queries with proper nesting, indentation, and uppercase keyword capitalization.

Why use SQL Formatter offline?

Messy query scripts are hard to read and debug. This local SQL Formatter structures complex queries instantly without transmitting database schemas or tables to external services.

When should you use this tool?

Use when dealing with minified HTML, unformatted CSS stylesheets, or legacy SQL database query outputs.

Key Benefits

Reduces git diff bloat by standardizing code styles.
Runs fully offline: completely secure for proprietary codebase blocks.
Auto-indents nested structures.

Common Use Cases

Beautifying minified database queries to debug relational constraints.
Indenting messy markup code before staging it in production repositories.
Cleaning legacy stylesheets to identify duplicate selectors.

Developer Notes & Best Practices

Uses standard lexical parsers to build clean abstract syntax trees before indentation output.

Remove double spacing before running standard formatting scripts.
Check syntax validity before formatting to ensure nesting is preserved.
Utilize copy shortcuts to avoid copy-paste errors.

Common Mistakes

Using reserved words as identifiers without escaping them in backticks or quotes.
Leaving trailing commas in the SELECT list, causing parsing errors in database engines.

Limitations

Invalid syntax blocks may fail to parse and format.

Structured Input/Output Example

Input Example

select id,name,email from users where active=1 order by created_at desc limit 10;

Output Example

SELECT
  id,
  name,
  email
FROM
  users
WHERE
  active = 1
ORDER BY
  created_at DESC
LIMIT
  10;

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SQL Formatter