Code review
Make joins, filters, projections and ordering easier for reviewers to inspect.
Developer Tools
SQL Formatter Online Free
Format and beautify SQL queries online for free. Clean messy SQL, improve query readability and format SELECT, JOIN, INSERT, UPDATE, DELETE and stored procedure queries.
SQL Formatter and Beautifier
SQL Formatter helps developers, database administrators and analysts convert unformatted SQL into readable, structured and properly indented SQL code. It is useful when working with long queries, reports, stored procedures, joins and database scripts.
Format SQL Queries Online
Paste your SQL query and format it instantly in the browser. Clean SQL is easier to review, debug, document and share with team members.
SELECT customers.name, orders.total FROM customers INNER JOIN orders ON customers.id = orders.customer_id WHERE orders.total > 1000 ORDER BY orders.created_at DESC;
Supported SQL Use Cases
- ✓ Format SELECT queries
- ✓ Beautify JOIN queries
- ✓ Format INSERT and UPDATE queries
- ✓ Clean stored procedures
- ✓ Improve SQL readability
- ✓ Prepare SQL for documentation
- ✓ Debug complex database queries
- ✓ Format SQL scripts before sharing
SQL Formatting Example
Before Formatting
select id,name,email from users where active=1 order by created_at desc;
After Formatting
SELECT id, name, email FROM users WHERE active = 1 ORDER BY created_at DESC;
About SQL Formatter
SQL becomes difficult to review when joins, filters, subqueries and expressions are compressed into a single line. Formatting adds whitespace and indentation so developers, analysts and database administrators can understand the structure before debugging or reviewing a change. This is particularly useful when a query is copied from logs, an ORM, a report definition or a legacy stored procedure. Formatting does not validate table names, permissions, parameter types or execution plans, and it does not make an unsafe query secure. Before running SQL against a live database, replace literal values with parameters, confirm the target environment, inspect update or delete conditions and use a transaction where appropriate. The formatter is designed for readability across common SQL styles, but vendor-specific syntax may require manual adjustment. Use the output as a review aid, then test the query in the correct database engine and inspect its execution plan when performance matters.
Where This Tool Helps in Real Work
Reading SQL copied from application and ORM logs
Reviewing ERP, ePOS and reporting queries with many joins
Preparing a query for code review or support documentation
Comparing two versions of a stored procedure or migration script
Common Mistakes to Avoid
- • Assuming formatted SQL has been validated or optimised
- • Running UPDATE or DELETE statements without checking the WHERE clause
- • Keeping user input directly inside SQL strings
- • Ignoring database-specific functions and quoting rules
Practical Best Practices
- ✓ Use parameters rather than concatenating input
- ✓ Review affected rows inside a transaction before committing changes
- ✓ Inspect execution plans for slow production queries
- ✓ Keep formatting consistent with the team's coding standard
Key Features
✓ Format common SQL statements
✓ Improve clause readability
✓ Minify SQL when needed
✓ Copy formatted output
✓ Load sample query
✓ Local browser processing
How to Use
- Paste the SQL copied from code, logs or a report.
- Select formatting or minification.
- Review joins, filters and statement boundaries carefully.
- Test the result in the intended database before production use.
Worked Example
Input
select o.id,c.name,sum(p.amount) total from orders o join customers c on c.id=o.customer_id join payments p on p.order_id=o.id where o.status='PAID' group by o.id,c.name order by total desc
Output
SELECT o.id, c.name, SUM(p.amount) AS total FROM orders o JOIN customers c ON c.id = o.customer_id JOIN payments p ON p.order_id = o.id WHERE o.status = 'PAID' GROUP BY o.id, c.name ORDER BY total DESC;
Frequently Asked Questions
Does formatting change query behaviour?
It should only change whitespace and presentation, but always review the output when vendor-specific syntax or strings are involved.
Does this optimise SQL?
No. Optimisation requires indexes, statistics, execution plans, data distribution and knowledge of the target database.
Which databases are supported?
Common SELECT, INSERT, UPDATE and DELETE syntax is readable across SQL Server, PostgreSQL, MySQL and Oracle, but specialised syntax may need manual review.
Is my query sent to a server?
No. Formatting is performed in your browser.
Related Tools
Developer authority guide
Use SQL Formatter with confidence
Reformat SQL into a consistent, readable layout for code review, debugging and documentation. Formatting changes presentation, not query correctness, execution plans or security. Always test the resulting statement against the intended database dialect and environment.
✓ Runs in your browser
✓ No account required
✓ Free developer utility
✓ Mobile and desktop ready
Practical use cases
Query debugging
Expose nested conditions and subqueries that are difficult to understand in minified SQL.
Documentation
Present examples consistently in technical guides and runbooks.
Log investigation
Reformat captured statements before analysing parameters and execution behavior.
Recommended workflow
- 1
Paste the SQL statement or script.
- 2
Select the closest supported SQL dialect and formatting preferences.
- 3
Format the query and review keyword, indentation and comma placement.
- 4
Run syntax and behavior tests in a safe database environment before deployment.
Developer correctness
Validate syntax, semantics and runtime assumptions
Developer utilities can transform representation without proving that the result is correct for a production system. Syntax, encoding, runtime-specific rules, schemas and security context all matter. Treat browser output as a fast inspection aid, then validate it in the target language, framework or deployment environment.
Syntax vs semantics
A value can be syntactically valid while still violating an API contract or business rule.
Encoding
Unicode, escaping and byte representation can change how data is interpreted across systems.
Runtime differences
Regex, date parsing, SQL and serialization behaviour can vary between engines and libraries.
Security context
Encoding, hashing and formatting do not replace validation, authorization or safe APIs.
What the operation can change
- Formatting should preserve values but may normalise whitespace.
- Minification removes presentation whitespace and can make debugging harder.
- Encoding changes representation, not trustworthiness or confidentiality.
- Generated code still needs review for naming, nullability and framework conventions.
Domain-specific verification
- Run the result through the destination parser or compiler.
- Test Unicode, empty values, nulls and deeply nested inputs.
- Compare behaviour against the production runtime and version.
- Never paste secrets, access tokens or confidential payloads into untrusted tools.
Engineering review
Prepare, verify and troubleshoot the result
Before using the tool
- ✓ Remove credentials and confidential literals.
- ✓ Select the database dialect that will execute the statement.
- ✓ Keep an untouched copy of generated or production SQL.
Before using the output
- ✓ Compare the formatted query with the original statement.
- ✓ Run syntax and behaviour tests in a safe database.
- ✓ Review execution plans separately when performance is important.
ProblemPractical check
Vendor syntax formats poorlyChoose the closest dialect and isolate proprietary procedural sections.
Query result changedCompare tokens and comments; formatting should not be used as a semantic rewrite.
Query is still slowInspect schema, indexes, statistics, parameter values and the execution plan.
Implementation notes
- • Formatting does not validate or optimize SQL.
- • Use parameterized commands to prevent injection; formatting provides no security control.
Common mistakes to avoid
Assuming formatting validates SQL
A formatter can display invalid or dialect-incompatible statements.
Pasting production secrets
Remove credentials, personal data and confidential literals before sharing SQL.
Ignoring dialect differences
Quoting, functions, limits and procedural syntax vary across databases.
Changing generated SQL manually
ORM-generated statements may be reformatted for reading but should usually be changed through the source query.
Professional tips
- ✓Parameterize values instead of concatenating user input.
- ✓Review execution plans separately from formatting.
- ✓Use a team-agreed SQL style in source control.
- ✓Format a copy when investigating production logs.
Frequently asked questions
Does formatting change query results?
Whitespace and keyword casing normally do not change results, but always review and test generated output.
Can a formatter optimize SQL?
No. Optimization requires schema knowledge, statistics, indexes and an execution plan.
Which SQL dialect should I select?
Choose the database that will execute the query, such as SQL Server, PostgreSQL or MySQL.
Can I format multiple statements?
Many formatters support scripts separated by statement terminators, depending on the parser.
Does this prevent SQL injection?
No. Use parameterized commands and safe data-access APIs.
Why does vendor-specific syntax format poorly?
The selected parser may not fully support proprietary procedural or extension syntax.