Browse categories

Developer Tools

SQL Formatter

Make SQL with joins, subqueries and CASE expressions easier to inspect without executing it.

Your data is processed locally in your browser and is never uploaded.Maximum: 4 MB per file. Input is not saved in browser storage or placed in the URL.
Output

Limitation: This formats tokens only. It does not execute SQL or verify tables, columns, permissions, procedures, dialect semantics or runtime behaviour.

How to use this tool

  1. Load a .sql file or paste SQL and format it, then compare the output with the source.
  2. Review the live result and use Copy result when you need to share it.

How the transformation works

A token-aware formatter preserves quoted strings and comments while adding line breaks. It does not connect to a database. Processing runs entirely in this browser. The page does not upload, persist, execute or remotely inspect the supplied content.

Processing rules

A token-aware formatter preserves quoted strings and comments while adding line breaks. It does not connect to a database. Processing runs entirely in this browser. The page does not upload, persist, execute or remotely inspect the supplied content.

Step-by-step transformation

  1. Load a .sql file or paste SQL and format it, then compare the output with the source.
  2. A token-aware formatter preserves quoted strings and comments while adding line breaks. It does not connect to a database. Processing runs entirely in this browser. The page does not upload, persist, execute or remotely inspect the supplied content.
  3. Check the displayed result, then copy it if needed.

Worked example

A SELECT containing a LEFT JOIN, derived table, CASE and EXISTS subquery becomes an indented review copy.

Methodology and review

Who this is for

Developers making complex SQL easier to review.

Inputs and units

  • SQL text or local file
  • Formatting options

Method

A token-based formatter identifies SQL keywords, comments, quoted values, parentheses, clauses, joins, CASE expressions, and subqueries without executing the statement.

Worked example

A query with JOIN, CASE, and a nested SELECT is laid out by clause while quoted strings remain intact.

Assumptions

  • Input is a readable SQL dialect supported by the formatter's token rules.
  • Formatting should not change tokens or query semantics.

Common mistakes

  • Expecting execution or database validation
  • Assuming every vendor extension is parsed

Limitations

  • The tool does not connect to a database, prove correctness, or fully parse every vendor extension.
  • Review generated layout before committing production SQL.

How this tool was checked

Fixtures compare joins, subqueries, CASE expressions, comments, strings, and nested clauses before and after formatting.

Related tools

Calculation review: 21 August 2026. Published by Goldwave Dynamics Limited. This is an internal product review, not an independent certification.

Risk guidance

Frequently asked questions

Does this tool send my inputs anywhere?

No. The interactive calculation runs in your browser and this site does not submit tool inputs to a backend.

How should I use the result?

Check that the entered units and values match your situation, especially around dates, breaks, and rounding.

Related tools