SQL Schema Diff & Compare
Paste two SQL schemas (DDL) to see highlighted line-by-line differences, a change summary, and a similarity percentage. Everything is processed on your device.
Everything runs in your browser. Your data is never sent to our servers.
Example
Example Input
two CREATE TABLE scripts
Example Output
changed columns/types
How to Use
- 1Paste the first SQL schemas (DDL) (A) in the left box and the second (B) in the right box.
- 2Adjust the options if needed (ignore case, whitespace, or empty lines).
- 3Click Compare (or press Ctrl+Enter).
- 4See the highlighted differences, a summary of how many changes there are, and the similarity percentage. Switch between side-by-side / unified / inline views.
About SQL Schema Diff & Compare
SQL Schema Diff & Compare compares two schema definitions (CREATE TABLE statements and other DDL) to reveal changes to tables, columns, types, or constraints.
The line-by-line view highlights added columns, type changes, or removals, making migration reviews easy.
FAQ
What is the difference between "diff" and "compare"?
Both are done by the same tool. "Diff" highlights the lines/parts that changed (added/removed), while "compare" shows how similar the two inputs are (similarity percentage + summary). You get both at once here.
Is my data sent to a server?
No. The entire comparison is computed in your browser with JavaScript. Nothing is uploaded, logged, or stored on our servers — safe for sensitive data.