SQL Formatter & Beautifier

No. The formatter only modifies whitespace, indentation, and (optionally) keyword letter case. The logical structure — table names, column names, conditions, joins, expressions — is never altered. A formatted query produces exactly the same result as the original when run on a database. You can safely format and then copy back to your application without any risk of introducing logic changes.

Yes. Single-line SQL comments (-- comment to end of line) and block comments (/* multi-line comment */) are recognized and preserved in the formatted output. String literals (single-quoted values), quoted identifiers (backtick or double-quote depending on dialect), and numeric literals are all handled correctly — they are never split across lines or modified during formatting. Nested quotes and escaped characters within strings are also preserved.

There is no SQL standard requirement — keywords work in any case in most databases. However, uppercase keywords (SELECT, FROM, WHERE, JOIN) is the overwhelmingly dominant convention in SQL code for one key reason: readability. When you scan a formatted SQL query, uppercase keywords stand out from lowercase table/column names, making the query structure instantly visible. This tool defaults to uppercase keywords, which is the convention in most SQL style guides including those from Google, GitLab, and Kickstarter.

Yes, for general formatting purposes. The core SQL syntax (SELECT, JOIN, WHERE, etc.) is standard across MySQL, PostgreSQL, SQLite, SQL Server, and Oracle. Database-specific syntax is typically accepted but may not format perfectly — for example, PostgreSQL-specific :: type casting, SQL Server T-SQL-specific functions, or MySQL LIMIT/OFFSET syntax. If you see unexpected formatting in dialect-specific code, the logic is still correct — only the indentation presentation may vary.

Unformatted SQL is a common source of missed bugs in code reviews. When a query is one long line, it is easy to miss a missing JOIN condition (causing a cartesian product), an accidentally omitted WHERE clause (affecting all rows), or incorrect precedence in AND/OR conditions. Formatted SQL puts each clause and condition on its own line, making structural errors visually obvious. Many teams require SQL to be formatted before review for exactly this reason.

Basic multi-statement SQL (multiple SELECT or INSERT statements separated by semicolons) is handled — each statement is formatted independently. However, stored procedures, PL/pgSQL, T-SQL blocks with BEGIN/END, and complex procedural SQL may not format cleanly as the formatter focuses on standard DML/DDL statements. For stored procedures, try formatting individual statements within the procedure body rather than the entire procedure definition.

No. All formatting runs in your browser using JavaScript. Your SQL queries, including any table names, column names, data values, or connection strings in the query, never leave your device. This makes it safe to format production queries containing real data references or proprietary schema information.