Jam SQL Studio Free SQL Developer Tools
Small, fast tools for everyday SQL work — built by the team behind Jam SQL Studio. Everything runs locally in your browser: no signup, no upload.
SQLite Playground
Run SQL in your browser against a preloaded Chinook sample database — a full SQL IDE on SQLite compiled to WebAssembly, no signup.
Execution Plan Viewer
Open a .sqlplan, PostgreSQL EXPLAIN JSON, or MySQL EXPLAIN and see the operator graph with costs, estimated vs actual rows, warnings, and a two-plan compare.
SQL Formatter
Format and beautify SQL with dialect-aware rules for T-SQL, PostgreSQL, MySQL, PL/SQL, and SQLite.
CSV to SQL Converter
Paste CSV or spreadsheet data and get INSERT statements or a CREATE TABLE script with inferred column types.
Excel to SQL Converter
Upload an .xlsx workbook and get INSERT statements or a CREATE TABLE script with inferred column types — sheet picker included.
JSON to SQL Converter
Paste a JSON array, NDJSON, or mongoexport output and get CREATE TABLE and INSERT statements for five engines, typed by the desktop app's import inference.
CSV to JSON Converter
Paste or upload CSV and get a pretty-printed JSON array or NDJSON, with numbers and booleans inferred per column.
SQL JSON Query Builder
Paste a JSON column value, click a field, and get the SELECT or WHERE clause for SQL Server, PostgreSQL, MySQL, Oracle, and SQLite side by side.
Connection String Converter
Parse ADO.NET, JDBC, URL-style, and libpq connection strings — and convert between the formats.
SQL IN Clause Generator
Turn a pasted list into a quoted, escaped, deduplicated IN (...) list — with Oracle's 1,000-item limit handled.
SQL Data Type Converter
Map data types across SQL Server, PostgreSQL, MySQL, Oracle, and SQLite — with precision and pitfall notes.
WKT Viewer: Draw WKT, GeoJSON, WKB & SQL Hex
Paste WKT, GeoJSON, WKB/EWKB, or a spatial hex value from SQL Server, PostGIS, MySQL, SpatiaLite or GeoPackage and see it drawn on a canvas — with bounding box, centroid, and WKT↔GeoJSON conversion. Runs entirely in your browser.
SQL Server Deadlock XML Viewer
Open an .xdl or Extended Events deadlock report in your browser and see the victim, processes, locks and owner/waiter graph. Nothing is uploaded.
Why are these free?
We build Jam SQL Studio, a desktop SQL client for SQL Server, PostgreSQL, MySQL, Oracle, and SQLite. These tools solve small versions of problems the app solves in full — the same engine-specific knowledge (quoting rules, type mappings, connection string formats) that powers the app powers these pages. If a tool saves you a few minutes, the full app probably saves you more.
Each tool runs entirely client-side. Your SQL, data, and connection strings never leave your machine — the same privacy stance the desktop app takes.
Need more than a one-off tool?
Jam SQL Studio brings IntelliSense, Table Explorer, schema compare, execution plans, and an AI-ready MCP server to all five engines — in one free desktop app.
Free for personal use • No account required • Mac, Windows, Linux