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Sur SQL Formatter
What is the SQL Formatter?
The SQL Formatter is a free online tool that turns tangled, one-line SQL queries into clean, consistently indented code you can actually read. Whether you inherited a 400-line stored procedure, exported a query from a database console, or copied a monster SELECT statement out of an application log, this tool restructures it in seconds — breaking clauses onto their own lines, indenting JOIN, WHERE, GROUP BY, and ORDER BY blocks, and standardizing keyword casing so the logic jumps off the screen.
Unlike server-side formatters that upload your queries to a remote API, our SQL Formatter runs entirely in your browser. It uses a client-side tokenizer that genuinely understands SQL syntax: keywords, identifiers, string literals, numbers, operators, and comments are each recognized for what they are. Because everything happens locally, your database schema, table names, and query logic never leave your computer — a must when you are working with production data or client databases.
The tokenizer is careful where naive text-based formatters are not. Strings wrapped in single quotes, double quotes, or backticks are preserved exactly as written — even if they contain words like "select" or embedded semicolons that would confuse a simple find-and-replace formatter. Comments, both single-line (--) and block (/* */) styles, stay exactly where you put them. The result is formatting you can trust: the logic of your query never changes, only its appearance.
How to Use the SQL Formatter
Formatting your SQL takes less than a minute. Follow these steps:
Paste your SQL into the input box. It can be a single SELECT, a multi-statement script, an INSERT, an UPDATE, or a full stored procedure.
Choose keyword case: pick UPPERCASE (the classic SQL convention), lowercase, or leave keywords exactly as-is. Uppercase keywords make clauses pop visually against lowercase table and column names.
Pick a layout mode:Expanded puts every major clause on its own line with deep indentation — ideal for reading and debugging. Compact keeps related elements together for a tighter layout that fits more code on one screen.
Click "Format SQL." The tokenizer scans your query, identifies clauses, strings, and comments, and rebuilds it with clean line breaks and indentation.
Review the output. Check that subqueries are indented under their parent queries and that string literals and comments survived untouched.
Copy the result with the copy button, or download it as a .sql file to drop straight into your editor or migration folder.
Reformat anytime. Tweaked the query? Paste the new version and format again — the tool is stateless and instant.
Work worry-free: because formatting is 100% client-side, you can safely format queries containing real table and column names without exposing anything to anyone.
Key Features
Client-side tokenizer: a real SQL-aware parser running in your browser — no API calls, no uploads, no waiting on a server.
Keyword case control: convert all SQL keywords to UPPERCASE or lowercase with one click, or preserve your original casing.
Smart clause indentation: JOIN, WHERE, GROUP BY, HAVING, and ORDER BY blocks are indented under their parent SELECT for instant visual hierarchy.
Line breaks before major clauses: SELECT, FROM, WHERE, and friends each start on a fresh line so you can scan a query from top to bottom.
String preservation: single-quoted, double-quoted, and backtick-quoted strings are never altered — even if they contain the word "select" or embedded semicolons.
Comment preservation: both -- line comments and /* block */ comments keep their exact position and content.
Subquery support: nested SELECT statements are indented one level deeper, making complex multi-table JOINs with subqueries readable at a glance.
Compact and expanded modes: choose dense output for logs and chat messages, or airy output for careful code review.
Copy and download: one-click copy to clipboard plus a download button that saves your formatted query as a .sql file.
Free with no signup: unlimited formatting, no account, no watermarks — just paste and go.
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Pro Tips for Writing Clean, Readable SQL
Pick one keyword convention and stick to it. UPPERCASE keywords with lowercase identifiers is the most widely recognized style — our formatter can enforce it across your whole team automatically.
Give every clause its own line. A WHERE buried at the end of a 200-character line is a bug waiting to happen; expanded mode fixes this instantly.
Indent subqueries one level deep. When a SELECT lives inside another SELECT, indentation is the fastest way to see which WHERE belongs to which query.
Use short, meaningful table aliases in multi-table JOINs (for example, customers c), then format so each JOIN starts on its own line.
Avoid SELECT * in production code. Listing columns explicitly makes formatted output self-documenting and protects you from unexpected schema changes.
Comment the why, not the what. A short -- why this filter exists note survives formatting untouched and saves the next reader an hour of head-scratching.
Spot-check tricky literals after formatting. If your query contains strings with the word "select" or semicolons inside quotes, glance at the output once to confirm they are byte-identical.
Use compact mode for sharing. Pasting SQL into a chat message, ticket, or email? Compact mode keeps it readable without scrolling for days.
Who Uses a SQL Formatter?
Backend developers cleaning up queries generated by ORMs or copied from application logs before committing them to a codebase.
Database administrators reviewing long stored procedures, triggers, and migration scripts during audits, deployments, and incident response.
Data analysts sharing ad-hoc analysis queries with teammates who need to understand the logic at a glance.
Students and bootcamp learners discovering what well-structured SQL looks like while learning JOINs, aggregations, and subqueries.
Support and QA engineers formatting customer-reported queries before reproducing a bug in a test environment.
Frequently Asked Questions
Does the formatter handle CTEs and window functions?
Yes. Common table expressions (WITH clauses) and window functions like ROW_NUMBER() and RANK() are parsed as ordinary query structure — the CTE body gets its own indented block and window function calls pass through untouched. Because unknown tokens are never rewritten, even newer syntax the tokenizer has not seen still formats safely instead of breaking.
Does the SQL Formatter send my queries to a server?
No. The formatter runs 100% in your browser using a client-side tokenizer. Your SQL — including table names, column names, and any literal values — never leaves your device, which makes it safe to use with production or client databases.
Will formatting change what my query does?
Never. The tool only changes whitespace, line breaks, and keyword casing. It does not reorder clauses, rename anything, or touch the logic in any way. A formatted query returns exactly the same results as the original.
Does it work with MySQL, PostgreSQL, and SQLite?
Yes. The tokenizer handles the standard SQL syntax shared across the major databases, including quoted identifiers, common functions, and subqueries. Dialect-specific extensions generally format fine too, since unrecognized tokens are passed through untouched.
What happens to semicolons inside string literals?
They are preserved. The tokenizer recognizes quoted strings and never treats a semicolon inside quotes as a statement terminator, so values like 'Order #42; priority shipping' come through byte-identical.
Can I format multiple statements at once?
Yes. Paste an entire script with several statements separated by semicolons, and each statement is formatted individually, in order, ready to save or run.
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