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Tools / Test SQL Queries Online

Test SQL Queries Online

Test and run SQL queries against a real PostgreSQL database right in your browser. Powered by PGlite (Postgres compiled to WebAssembly). No setup, no server, no signup — your data stays on your device.

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Run a query to see results...

Features

Real PostgreSQL in Your Browser

Powered by PGlite — a full PostgreSQL instance compiled to WebAssembly. Not a simulator or subset.

No Setup Required

No database server, no Docker, no installation. Open the page and start writing SQL instantly.

Persistent Storage

Your database persists in your browser's IndexedDB. Tables and data survive page reloads.

Complete Privacy

Everything runs locally. Your queries and data never leave your device — zero server communication.

Full SQL Support

CTEs, window functions, JOINs, subqueries, JSON operators, aggregates — the full PostgreSQL dialect.

No Signup

Unlimited use with no account. Practice SQL, prototype schemas, or test queries with no limits.

FAQ

Frequently Asked Questions

How do I test a SQL query online?

Paste or type your SQL into the editor above and click Run (or press ⌘Enter). The playground runs a real PostgreSQL database in your browser via WebAssembly, so you can test queries with full Postgres compatibility — CTEs, window functions, JOINs, JSON operators, and more — without installing anything.

Is my data safe in the SQL playground?

Yes. Everything runs locally in your browser. Your queries and data are never sent to any server. The database is stored in your browser's IndexedDB, so your tables and data persist across page reloads but never leave your device.

Can I import my own data into the playground?

Yes. You can upload CSV or TSV files from the Edit DB tab. Each file becomes a table named after the file. The tool supports comma-separated, tab-separated, and semicolon-separated formats, as well as UTF-8 and UTF-16 encoded files.

What SQL features does the playground support?

The playground runs full PostgreSQL, so it supports SELECT, INSERT, UPDATE, DELETE, CREATE TABLE, CTEs (WITH clauses), window functions, JOINs, subqueries, JSON/JSONB operators, aggregates, and more. The only limitation is features that require server-level access like COPY or extensions.

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