Free SQL Formatter Online
If you write SQL, at some point you will need to format it. Maybe you copied a query from application logs where it was one giant line. Maybe you inherited a stored procedure where the indentation looks like a seismograph reading. Or maybe you just want your code to look professional before pasting it into a pull request.
This is a free online SQL formatter that handles all of those situations — and it does not ask for your email, show you ads on the formatted output, or send your queries to a remote server. The formatting runs entirely in your browser.
Why This Formatter Is Actually Free
Most "free" SQL formatters have a catch. Some put ads on top of your output. Some limit you to 500 lines unless you pay. A few even send your SQL to a backend server — which is a security concern if you are working with production queries.
This one is different because the formatting engine runs in JavaScript, inside your browser. There is no server to pay for, no database to maintain, no API calls to meter. When you paste SQL and hit format, the sql-formatter library does all the work on your device.
That also means it works offline. Load the page once, disconnect from the internet, and it still formats SQL. Try that with a server-based formatter.
How to Format SQL Online
Using the formatter takes about five seconds:
- Paste your SQL into the left pane. It can be a one-liner from logs or a thousand-line stored procedure.
- Pick your dialect from the dropdown. This matters — PostgreSQL and MySQL handle backtick quoting differently, and the formatter adjusts accordingly.
- Choose indentation (2 spaces, 4 spaces, or tabs). This is the spacing style that will be applied consistently throughout.
- Click Format or press
Ctrl+Enter (Cmd+Enter on Mac). The formatted output appears instantly in the right pane.
- Copy the result with the green Copy button, or edit further in the input and reformat.
💡 Pro tip: Use Cmd/Ctrl+Enter as a keyboard shortcut. When you are iterating on a query — format, tweak, format, tweak — this saves a surprising amount of time versus reaching for the mouse each time.
Supported SQL Dialects
The formatter supports 15+ SQL dialects. If you are not sure which one to pick, Standard SQL works for most cases. But if your query uses dialect-specific features — like PostgreSQL :: casting or MySQL backtick quoting — selecting the right dialect produces cleaner output.
- MySQL / MariaDB — handles backtick-quoted identifiers and
REPLACE INTO syntax
- PostgreSQL — preserves
::type casting and RETURNING clauses
- T-SQL (SQL Server) — formats
TOP, CROSS APPLY, and bracket-quoted identifiers
- PL/SQL (Oracle) — handles
BEGIN...END blocks and DECLARE sections
- BigQuery, Snowflake, Redshift — cloud data warehouse dialects
- SQLite, Spark, Hive, DB2, Trino, SingleStoreDB
Tips for Better SQL Formatting
1. Format before code review
Reading someone else's unformatted SQL is a cognitive tax. Before you drop a query into a pull request or Slack, format it. The reviewer will understand your logic faster and spot actual issues instead of getting distracted by formatting inconsistencies.
2. Use consistent indentation across your team
Pick one indentation style (4 spaces is the most common) and standardize on it. The formatter enforces this consistently every time, which eliminates the "tabs vs spaces" debate that has derailed more standups than you would believe.
3. Format ORM-generated SQL for debugging
ORMs like Prisma, SQLAlchemy, and Entity Framework produce perfectly valid SQL — but it is almost always a single unreadable line. Paste it here, format it, and suddenly you can trace the joins and see where the N+1 query problem is hiding.
💡 Quick sanity check: SQL that looks well-structured is SQL you can reason about. If a query still looks confusing after formatting, the logic itself probably needs refactoring — the formatter just helped you see it.
Frequently Asked Questions
Is this SQL formatter really free?
Yes. The formatter runs entirely in your browser using JavaScript. There is no server to maintain, so there is no cost to pass on. No ads, no signup required, no query size limits beyond your browser memory.
Does my SQL data get sent to a server?
No. All formatting happens client-side in your browser. Your SQL queries never leave your device. You can disconnect from the internet after loading the page and it will still work.
What SQL dialects are supported?
15+ dialects including Standard SQL, MySQL, PostgreSQL, SQLite, BigQuery, T-SQL, PL/SQL, MariaDB, Redshift, Snowflake, Spark, Hive, DB2, Trino, and SingleStoreDB.
Can I format large SQL files?
Yes. Since processing happens in your browser, the limit is your device memory - not an arbitrary server cap. Queries with thousands of lines format in under a second.
Does the formatter change my SQL logic?
No. It only adjusts whitespace, indentation, and keyword casing. Comments are preserved. The SQL logic - joins, conditions, subqueries - remains exactly the same as your input.
Can I use the free SQL formatter offline?
Once the page has loaded, every format action happens locally, so you can disconnect from the network and keep formatting SQL. Only a page reload needs a connection again.