A growing collection of free, browser-based utilities for SQL developers — format, convert, validate, visualize, and generate data without installing anything. Supports PostgreSQL, MySQL, SQLite, and more.
Tool Topics
The tools section now has dedicated topic hubs. If you already know the kind of job you are doing, start from one of these workflow pages instead of scanning the full catalog.
These pages group tools that tend to be used together. They give both users and crawlers a clearer picture of the workflows behind the catalog.
Formatting
Start here when the immediate goal is to clean, compress, and validate SQL before it reaches reviews, migrations, or production code.
View topic pageConversion
Useful when JSON, CSV, spreadsheets, or SQL seed files need to move quickly between application payloads and relational tables.
View topic pageSchema
Use this cluster when the challenge is understanding table structure, relationships, migration impact, or how to generate realistic data from a schema.
View topic pageAnalysis
Best when a query already exists and you need to explain it, spot performance risks, or translate search logic into SQL-friendly patterns.
View topic pageClean, validate and compress SQL
Format and beautify SQL queries with multi-dialect support and custom styling.
Open toolCompress SQL queries for production by removing whitespace and comments.
Open toolCheck SQL queries for syntax errors before running them against a real database.
Open toolTransform data between formats
Transform JSON objects or arrays into SQL INSERT statements and CREATE TABLE schemas.
Open toolConvert CSV spreadsheet data into SQL INSERT statements ready for import.
Open toolExport SQL query results and table data as structured JSON.
Open toolConvert regular expressions into SQL LIKE, SIMILAR TO, or REGEXP patterns for MySQL, PostgreSQL, and SQLite.
Open toolPaste Excel or Google Sheets data to generate SQL INSERT statements instantly.
Open toolConvert SQL between MySQL, PostgreSQL, and SQLite — data types, functions, and syntax.
Visualize schemas and queries
Generate SQL from data or specs
Many developers do not need a random SQL tool. They need a repeatable workflow. These starting paths group the tools by real jobs you might need to finish this week.
Start with formatting, then compress for shipping, and finally validate the syntax before you paste into a migration or app codebase.
When spreadsheet or API payloads need to become SQL fast, use the converters instead of hand-editing inserts.
Use the visual and analysis tools when you need to understand structure, explain complex SQL, or catch performance risks before deployment.
A tool often solves one step of the job. These recommendation paths connect the relevant tool workflow with the article cluster that explains the underlying SQL ideas.
Performance
Best when the query already exists and you need to understand why it is slow, what the planner is doing, and which anti-patterns to remove first.
Data Conversion
Use this path when payloads, spreadsheets, or seed files need to become relational inserts quickly without writing one-off scripts.
Schema Design
Useful when the hard part is table structure, relationships, migration impact, or how to explain a schema clearly before implementation.
Advanced SQL
A good path when the challenge is less about syntax and more about understanding multi-step logic, CTEs, window functions, and interview-style problem solving.
Every SQL Boy tool runs entirely in your browser using WebAssembly. Nothing is uploaded to a server, which matters when your SQL contains sensitive schema or production data.
Your SQL never leaves your machine. All parsing, formatting, and generation happens locally — even while offline.
No round-trip to a server means results appear as you type. Format, validate, or convert thousands of rows without waiting.
No account, no OAuth, no CLI to install. Open a tool, paste your SQL, get the output. Bookmark what you use most.
Good tools speed up execution, but they do not replace judgment. These guides explain the SQL ideas that make the tools useful in the first place.
Learn why a query planner chooses scans or seeks before using the Query Analyzer.
Read guidePair this with the Query Explainer when you need to understand why a query feels slow.
Read guideUseful context when your SQL works but still performs badly in production.
Read guideHelpful when generating or transforming SQL programmatically with the converter tools.
Read guideUseful when ER diagrams, schema diffing, and mock data generation all point back to table design choices.
Read guideRelevant when JSON conversion tools are part of a broader schema or semi-structured data workflow.
Read guideA practical bridge from playground experimentation into grouped reporting and query-review workflows.
Read guideImportant context when validators, regex conversion, or dynamic SQL tooling are used around user input.
Read guideYes — every tool on this page is permanently free. There is no freemium tier, no usage cap, and no account required. SQL Boy is funded by ads, not subscriptions.
All processing happens entirely in your browser using WebAssembly and JavaScript. Once the page has loaded, the tools work offline — your SQL never leaves your machine.
Most tools support PostgreSQL, MySQL, and SQLite. The SQL Formatter also supports MariaDB, Microsoft SQL Server (T-SQL), BigQuery, and several others. Each tool page lists its dialect support explicitly.
Open the SQL Formatter, paste your query, pick a dialect and indent style, and click Format. You can copy the result or use the built-in SQL editor. Nothing to install.
Yes. The Mock Data Generator accepts a CREATE TABLE statement, detects each column type, and produces a ready-to-run INSERT statement with realistic fake data. Supports up to 1 000 rows in the browser.
All computation runs locally in your browser — no SQL or schema data is sent to any server. You can verify this by using the tools while offline.