Free Online Tool

Database Schema Compare
Visual DB Diff Online, Free

Upload two database files and instantly see every schema difference — missing tables, extra columns, type mismatches — in a clear colour-coded diff. No command line, no database access required.

SQL & SQLite files Colour-coded diff No database access needed 100% free

Source Database (A)

Upload Database A

SQL or SQLite files supported

Target Database (B)

Upload Database B

SQL or SQLite files supported

What It Detects

Every Schema Difference, Clearly Highlighted

The tool compares the full structure of both databases and reports every difference in a colour-coded output.

🔴

Tables only in A

Tables that exist in the source database but are missing from the target. Shown in red.

🟢

Tables only in B

Tables that exist in the target database but are not in the source. Shown in green.

🟡

Column differences

Tables that exist in both databases but have different columns — missing or extra fields.

📋

Full table listing

All tables from both databases listed so you can see the complete picture at a glance.

⚡

Instant results

The comparison runs in seconds even for large schemas with dozens of tables.

🔒

No database access

Works entirely from uploaded files. No connection string, no credentials, no server access needed.

Why Compare Schemas?

Catch Schema Drift Before It Causes Problems

Schema drift happens when your development, staging and production databases get out of sync. One developer adds a column in development but forgets to write a migration. Another drops a table in staging that production still needs. Over time, the databases diverge and deployments start failing in unexpected ways.

The Schema Compare tool lets you upload two database files and see exactly what is different between them — before you deploy, before you migrate, before anything breaks. No command line, no database credentials, no server access required.

Common use cases

Comparing development and production schemas before a deployment
Verifying that a migration script was applied correctly
Auditing schema differences between two environments
Checking what changed between two database backups
Reviewing schema changes made by another developer

Schema Diff Output

-- Tables only in A (missing in B)
− sessions
− cache
-- Tables only in B (new in B)
+ analytics
-- Column differences in: users
− last_login (DATETIME)
+ last_seen_at (TIMESTAMP)
+ email_verified (BOOLEAN)

How It Works

Compare Two Database Schemas in Three Steps

The whole process takes under 30 seconds, even for large schemas.

📤

Upload Database A

Upload your source database file — a SQL dump or SQLite file. This is the baseline you are comparing from.

📁

Upload Database B

Upload the second database file — the one you want to compare against. Could be a different environment or a newer version.

🔍

See the Diff

Click Compare and get a colour-coded report of every table and column difference between the two schemas.

FAQ

Common Questions

Which file formats are supported?

SQL dump files (.sql) and SQLite database files (.sqlite, .db, .sqlite3) are supported. PostgreSQL dumps in .sql format also work.

Does it compare data or just the schema?

Just the schema — table names, column names and column types. It does not compare the actual data rows in the tables.

What does "schema drift" mean?

Schema drift happens when two databases that should be identical end up with different structures over time. This usually happens when migration scripts are not applied consistently across all environments.

Can I compare a development database against production?

Yes. Export a SQL dump from each environment, upload both files, and the tool will show you exactly what is different between them.

Does it show column type differences?

The current version shows missing and extra columns. Column type differences within the same column name are shown where detected.

Is my data safe?

Your files are processed on our server and deleted automatically within two hours. We never read or store the contents of your database beyond what is needed to perform the comparison.