Does this validate that my SQL is correct?

No — it's a formatter, not a linter or validator. It reflows whitespace, casing, and line breaks; it doesn't check joins, logic, or whether the query would actually run.

Can it expand SELECT * into explicit column names?

No — that requires knowing the actual table schema (real column names), which means a live database connection. This tool never connects to a database or asks for credentials; it only reformats the SQL text you paste in.

Can I choose leading or trailing commas?

Not independently — the underlying formatting engine doesn't expose that as a separate option in its current version. Indent style, keyword case, identifier case, comment handling, dialect, and tab width are all configurable.

Does removing comments ever touch my actual query text?

It's built to avoid that specifically — comment removal uses a character-by-character scanner that tracks whether it's inside a quoted string before treating -- or /* as a comment, so a string that happens to contain those characters is left alone. It only strips genuine -- and /* */ comments.

Is my SQL sent to a server?

No — formatting runs entirely client-side in your browser using an open-source formatting library. Nothing you paste in leaves your machine.

SQL Formatter: Beautify & Standardize SQL Online

Paste unformatted SQL and get it reformatted with consistent indentation, keyword casing, and line breaks — pick a dialect (Snowflake, PostgreSQL, MySQL, BigQuery, Redshift, SQL Server, SQLite, Spark, or generic SQL) so keywords specific to that engine are recognized correctly. Optionally case identifiers/functions/data types the same way as keywords, and keep or strip comments.

This is a formatter, not a validator: it reflows whitespace and casing, it doesn't check whether the query is logically correct, and it runs entirely in your browser — nothing you paste in is sent anywhere.