Database work splits into two halves. One half is designing and running a database: GUI clients, hosted Postgres and MySQL, schema designers and ORMs. Those are the listings above, and they are what you install when you need a persistent connection.

The other half is reading the SQL itself. When a query arrives as one unreadable line, when a migration has to be reviewed before it runs, or when you need to compare today's query against last week's, a formatter and a diff tool do the job with no database connection at all. Everything below runs client-side, so a production query can be pasted without shipping it anywhere.

🧰 Free DevToolBox Tools

Client-side and free — nothing you paste leaves your browser:

SQL Formatter Online — Format and beautify SQL in 15+ dialects, with a minifier and validator.
JSON Formatter — Inspect the JSON columns and API payloads your queries return.
Diff Checker — Compare two queries, or two migration files, line by line.
Timestamp Converter — Turn the Unix timestamps stored in your tables into readable dates.
Base64 Encoder/Decoder — Decode Base64 values held in database columns.
Base64 Decoder — Decode Base64 back to readable text or binary.
Hash Generator — Generate checksums for data-verification queries and fixtures.

❓ Frequently Asked Questions

Which SQL dialects does the formatter support?

MySQL, MariaDB, PostgreSQL, T-SQL (SQL Server), PL/SQL (Oracle), SQLite, Redshift, BigQuery, Spark, DB2, Hive and Snowflake, plus a standard ANSI mode. The dialect selector at the top of the tool switches between them.

Is it safe to paste a production query?

Yes. The formatter is client-side JavaScript and the query is never sent to a server. Remove literal credentials and customer data anyway — that is ordinary hygiene, not a limitation of the tool.

Do I still need a linter if I use a formatter?

Yes. A formatter changes how a query looks; a linter flags what it does — missing indexes, implicit casts, SELECT * in production code. Use the formatter to read the query and the linter to judge it.

Can the formatter handle stored procedures and PL/SQL blocks?

Select the matching dialect (PL/SQL for Oracle, T-SQL for SQL Server) and the formatter will indent procedure bodies, BEGIN/END blocks and control-flow statements rather than treating them as flat text.