SQL Formatter: beautify SQL for MySQL, PostgreSQL, SQL Server and Oracle
Input
Output
What is SQL?
SQL (Structured Query Language) is the standard language used to communicate with relational databases. It lets you define, organise and work with structured data stored in tables.
With SQL you can create and alter database structures, insert new records, update or remove existing ones, and query data to get the answers you need. Because of its wide adoption and relatively gentle learning curve, SQL remains a core skill for analysts, engineers and anyone who works with data-driven systems, and it is supported, with minor variations, by nearly every major database platform.
Why use a SQL formatter?
Writing SQL is easy; writing consistent, readable SQL across a team or a large project is harder. A formatter helps in a few concrete ways:
- Readability. Cleanly indented SQL is far easier to scan, especially in queries with multiple joins, subqueries or conditions. That matters even more on teams where several people touch the same codebase.
- Speed. Instead of aligning keywords and indenting clauses by hand, a formatter does it instantly, freeing you to focus on the logic of the query rather than its layout.
- Fewer bugs. Well-structured queries make it easier to spot missing clauses, mismatched parentheses or logic errors, which speeds up debugging and reduces the chance of shipping a broken query.
Example
SELECT * FROM Courses WHERE Category IN ('Data Science', 'Web Development');SELECT
*
FROM
Courses
WHERE
Category IN ('Data Science', 'Web Development');About Gradient Learning's SQL Formatter
Gradient Learning's SQL Formatter is a free, browser-based tool built to help learners and professionals turn messy SQL into clean, readable code. It works with multiple SQL dialects and gives you fine-grained control over exactly how your queries are styled.
What can you do with it?
- Instantly reformat SQL for better readability and consistency
- Choose from several formatting rules to match your team's style or your own
- Work across eight different SQL dialects
- Use it entirely free, right in your browser, with no installation and no sign-up
How to use the tool
- Paste your SQL query into the input panel on the left.
- The formatted query appears in the output panel on the right as you type. There is nothing to click.
- Adjust the dialect and formatting options in the toolbar, then use the copy or download button on the output panel.
Formatting options
Basic options (always visible)
| Option | What it controls | Possible values |
|---|---|---|
| Dialect | Which database syntax to format and highlight for | MySQL, PostgreSQL, MariaDB, SQLite, SQL Server (T-SQL), Oracle (PL/SQL), Cassandra (CQL), Standard SQL |
| Keyword Case | Casing of SQL keywords | Preserve, UPPERCASE, lowercase |
| Indentation Style | Overall layout of indented blocks | Standard, Tabular Left, Tabular Right |
| Indentation | Width of one indent level | 2 spaces, 4 spaces, 8 spaces, Tabs |
Advanced options (under “More”)
| Option | What it controls | Possible values |
|---|---|---|
| Expression Width | Maximum characters before a long expression wraps across lines | 20–200 (default 50) |
| Lines Between Queries | Blank lines inserted between separate statements | 0–5 (default 1) |
| Logical Operator | Whether AND / OR start a line or end the previous one | Before newline, After newline |
| Dense Operators | Whether operators are packed tightly without spaces | On, Off |
| Semicolon On Its Own Line | Whether a statement's semicolon moves to a new line | On, Off |
| Identifier Case | Casing of table and column names | Preserve, UPPERCASE, lowercase |
| Data Type Case | Casing of data types such as VARCHAR or INT | Preserve, UPPERCASE, lowercase |
| Function Case | Casing of function names such as COUNT or SUM | Preserve, UPPERCASE, lowercase |
Frequently asked questions
Why should I format my SQL queries?
Formatting improves readability and maintainability, makes debugging faster, and removes the manual effort of styling code by hand, which matters more and more as queries and codebases grow.
Is the Gradient Learning SQL Formatter safe to use?
Yes. The tool only reformats the text you provide. It runs entirely in your browser, so your query is never uploaded, stored or logged, and the page keeps working if you go offline after it loads.
Which SQL dialects are supported?
Eight: MySQL, PostgreSQL, MariaDB, SQLite, SQL Server (T-SQL), Oracle (PL/SQL), Cassandra (CQL) and standard SQL. Pick the one your database speaks: dialect-specific syntax only formats and highlights correctly when the dialect matches.
Why did my query fail to format?
Almost always an unclosed bracket, quote or backtick. Those are the things that stop the formatter reading the query at all. The error message names the line and column. When formatting fails the last successful result stays on screen, so you do not lose your work.
Does the formatter check my SQL for errors?
No, and it is worth knowing the difference. The formatter lays out the query without judging it, so a misspelled keyword or a missing table still formats quite happily: SELECT * FORM users comes back neatly indented. Only unbalanced brackets and unterminated quotes stop it. The SQL Validator, in the same set of tools, parses it properly and tells you where it is wrong.
Can it put commas at the start of a line?
Not currently. Leading-comma style was removed from the formatting engine we use, and moving commas afterwards with a find-and-replace would also move commas inside string literals and comments, which quietly changes what a query does.
Does formatting change what my query does?
Layout changes are safe. Two options can matter: Identifier Case rewrites table and column names, which some databases treat as case-sensitive, and Dense Operators removes spacing. Both are set to leave your SQL alone by default.