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Paste a query to catch anti-patterns, ambiguous references, and style issues — entirely in your browser. Nothing you paste is sent anywhere.
Results will appear here as you type.
SQL Linter is a free online tool that reviews your SQL for anti-patterns and style problems — SELECT *, comma-style implicit joins, missing WHERE clauses, ambiguous references, and more. Every query is analyzed locally in your browser; nothing is uploaded.
Yes. The SQL Linter is completely free with no signup and no usage limits, like all SqlInt mini tools.
Anti-patterns like SELECT *, implicit comma joins, missing WHERE clauses, and ambiguous references — with line-by-line diagnostics.
Yes, for safe auto-fixable issues only. Click “Fix auto-fixable issues” to apply formatting, casing, and alias fixes, with undo support. SELECT *, comma joins, and ambiguous references still need manual review.
No. Every mini tool processes data locally in your browser — pasted text and uploaded files never leave your device.
Beautify SQL live with instant preview across 7 dialects.
Turn CSV into CREATE TABLE + INSERTs with auto-detected types.
Convert JSON arrays to SQL — and INSERTs back to JSON — live.
Visualize INNER, LEFT, RIGHT, FULL & CROSS joins across up to 3 chained tables.