SQL Diff Online
Compare SQL schemas, migrations, or queries and find differences instantly.
What Is SQL Diff?
SQL Diff is a free online tool that compares two SQL files or queries line by line and highlights every addition, deletion, and modification. It is ideal for reviewing database migration changes, comparing schema versions, tracking ALTER TABLE statements, and auditing stored procedure updates across any SQL dialect including MySQL, PostgreSQL, SQLite, and MSSQL.
How to Use SQL Diff
- Paste your original SQL into the left panel.
- Paste the modified SQL into the right panel.
- Click Compare to see the highlighted differences.
- Use Split or Unified view to review changes.
Features
- Line-by-line SQL comparison
- Works with MySQL, PostgreSQL, SQLite, MSSQL and more
- Split and unified diff views
- Ideal for schema migrations and query reviews
- Added / removed line counters
- Copy diff result to clipboard
FAQ
Can SQL Diff compare database migration files?
Yes. Paste any SQL migration file — CREATE TABLE, ALTER TABLE, indexes, stored procedures — and SQL Diff will highlight every changed line.
Does SQL Diff validate SQL syntax?
SQL Diff compares SQL as plain text, so it works with any SQL dialect including MySQL, PostgreSQL, SQLite, and MSSQL.
Is my SQL data private?
Yes. All comparison runs entirely in your browser. Your SQL is never sent to any server.