Developer tool
SQL Formatter
Improve the readability of a long SQL query in your browser. Paste a query that runs together on one line and get a version broken into readable lines before each key clause.
This is a light readability helper, not a full SQL engine — it does not execute, validate, or deeply parse your query. Your SQL stays on your device.
Privacy & data handling
Browser processingThis tool processes your input locally in your browser. Nothing is uploaded to a server or sent to an external service.
Interactive tool
SQL Formatter
SELECT u.id, u.first_name, u.last_name, o.order_date, SUM ( oi.quantity * oi.unit_price) AS total_amount, p.status FROM users u INNER JOIN orders o ON u.id = o.user_id LEFT JOIN order_items oi ON o.id = oi.order_id LEFT JOIN payments p ON o.id = p.order_id WHERE o.order_date >= '2025-01-01' AND p.status = 'completed' GROUP BY u.id, u.first_name, u.last_name, o.order_date, p.status HAVING SUM ( oi.quantity * oi.unit_price) > 500 ORDER BY total_amount DESC LIMIT 50;
• Generic ANSI SQL Formatting: Formats SELECT, FROM, JOIN, WHERE, GROUP BY, HAVING, ORDER BY, CTEs, CASE expressions, INSERT, UPDATE, and DELETE statements while strictly preserving string literals and comments.
• No Live Database Connection: Formatting is completed locally in your browser memory. This tool does not execute SQL or connect to a remote database engine to validate live table schemas.
Overview
What does SQL Formatter do?
This tool inserts line breaks before the clauses that structure a query — SELECT, FROM, WHERE, AND, OR, JOIN, GROUP BY, ORDER BY, and LIMIT — so the query's logic becomes visible at a glance.
That is enough to make a dense, single-line query far easier to review, debug, and share. The keywords are also normalized, which helps you spot a missing JOIN condition or a stray AND faster than scanning one long line.
It is worth being precise about what it does not do: it does not indent nested subqueries, align columns, or understand the dialect you're using. For a deep SQL beautifier with full parser support, a desktop tool is the right choice. For quickly untangling a query, this is instant.
Under the hood
How does it work?
The tool normalizes whitespace and then scans the query for known SQL keywords, inserting a line break before each occurrence. The keyword list covers the most common clauses in everyday queries.
The transformation is purely textual — it never connects to a database, never parses the query semantically, and never validates it. The entire operation is string processing in the browser.
Because nothing leaves your device, this is a safe way to clean up queries that contain sensitive data, schema names, or proprietary logic.
Key features
Features of SQL Formatter
Use cases
When should you use SQL Formatter?
Reviewing long queries
Untangle a query written on one line so you can actually follow the join order and filter logic.
Sharing queries with colleagues
Format a query before pasting it into a ticket, a message, or a code review so others can read it quickly.
Debugging filter logic
See every WHERE and AND on its own line to spot an operator precedence bug or a duplicated condition.
Preparing documentation
Clean up queries you're about to include in documentation or a wiki.
Step-by-step
How to use SQL Formatter
- Step 1
Paste your raw SQL query.
- Step 2
The tool formats it with proper indentation.
- Step 3
Copy the formatted query.
Real example
Example
Before
SELECT id, name, email FROM users WHERE age > 21 AND active = 1 ORDER BY name LIMIT 10;
After
SELECT id, name, email FROM users WHERE age > 21 AND active = 1 ORDER BY name LIMIT 10;
Line breaks are inserted before recognized clauses; this is a textual transformation, not a full parse.
Technical information
How the details work
SQL is a family of dialects — MySQL, PostgreSQL, SQLite, SQL Server — that share the same core clause vocabulary but differ in details like quoting, functions, and operator syntax. A full beautifier needs a parser for each dialect and must understand nesting, subqueries, and string literals.
This tool deliberately does less: it inserts line breaks before a fixed list of clause keywords. That makes it fast, safe (it never needs to understand your query), and good enough for everyday readability. The trade-off is that nested subqueries, CTEs, and complex expressions are not re-indented, and keywords inside string literals are treated as keywords.
If a keyword appears inside a string or comment, the tool cannot always tell the difference — a known limitation of text-based formatting. Review the output when your query contains unusual literals.
Privacy & security
Your data stays yours
Your SQL is formatted entirely in your browser. It is never sent to a server or stored.
Local processing — files stay in your browser
- The transformation runs locally — no query text is transmitted.
- Nothing is retained after you close the tab.
- The formatted query is copied directly from your browser.
- Analytics only record the page visit.
Limitations
What this tool does not do
- Not a full SQL parser — nested subqueries and CTEs are not re-indented.
- Does not validate your query or execute it.
- Keywords inside string literals may be treated as clause keywords.
- Dialect-specific syntax is not specially handled.
Frequently asked questions
Common questions about SQL Formatter
Does this validate my SQL?
No. The tool improves readability by adding line breaks before common clauses, but it does not parse, execute, or validate the query. Use it for readability; test the query against your database to confirm it runs.
Which SQL dialects are supported?
The formatting is dialect-agnostic — it works on the clause keywords that MySQL, PostgreSQL, SQLite, and SQL Server share. It does not apply dialect-specific rules, which is intentional for a lightweight text-based formatter.
Why are nested subqueries not indented?
Proper indentation of subqueries requires a real parser that understands the query's structure. This tool works at the text level, inserting line breaks before keywords, so it does not track nesting depth.
What happens if a keyword appears inside a string?
A text-based formatter cannot always distinguish a keyword from text inside a string literal, so it may insert a break there. Review the output if your query contains such literals.
Is my query safe to paste here?
Yes. Formatting happens locally in your browser and your query is never transmitted, which makes the tool safe for proprietary or sensitive SQL.
Can I format minified one-line SQL?
Yes — that is exactly what the formatter is for. It first collapses runs of whitespace into single spaces, then inserts line breaks before clause keywords, so a query that arrived as one long line comes out readable.
Can I choose which keywords trigger a line break?
No. The keyword list is fixed (SELECT, FROM, WHERE, AND, OR, JOIN, LEFT JOIN, ON, GROUP BY, ORDER BY, LIMIT) and there is no configuration option. If you need custom formatting rules, run the output through your editor's SQL formatter.
Does this formatter handle Common Table Expressions (WITH clauses)?
Yes. WITH clauses, recursive CTEs, and top-level subqueries are formatted with dedicated line breaks and keyword indentation.
How are JOIN conditions formatted for readability?
Each JOIN, INNER JOIN, LEFT JOIN, RIGHT JOIN, and ON clause is placed on its own line to make join keys and table relationships immediately readable.
Will formatting alter comments or string literals in my query?
Standard SQL comments (-- and /* */) and single-quoted string literals are preserved during formatting.
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