Compare2Lists.online

Private browser-based SQL diff

Compare SQL Online

Paste two SQL queries or scripts, then review the meaningful changes in a clean side-by-side diff. SQL stays in your browser and is never executed.

SQL stays in this browser. Paste any size of SQL; very large comparisons use a faster local fallback to keep the page responsive. Local file selection remains limited to 2 MB.
Comparison mode
More options: dialect, formatting, and privacy

Dialect and formatting

Dialect selection improves local formatting and token recognition. It does not validate table names, database objects or runtime behavior.

Comparison rules

Results and privacy

Identifier case can differ by dialect, especially for quoted names. Comments can contain hints or operational instructions. Both ignore options are off by default where this matters.

Original SQL

Original SQL

0 characters - 0 lines - 0 statements

Paste SQL or choose a local file. It is never executed.

Changed SQL

Changed SQL

0 characters - 0 lines - 0 statements

Paste SQL or choose a local file. It is never executed.

What SQL comparison checks

SQL Compare Online reviews SQL source locally. Exact mode preserves every character-level difference, while formatted, token and statement modes reduce selected presentation noise to make query and script reviews easier to read.

Exact SQL diff versus formatted comparison

Use Exact Text when line endings, comments, indentation, semicolons and capitalization matter. Use Formatted SQL to compare a local preview with consistent keyword case and wrapping. Formatting can reduce visual noise, but it does not prove that two queries have the same result.

How SQL token comparison reduces formatting noise

Token mode separates keywords, identifiers, literals, operators, punctuation, placeholders and comments. This makes a changed status literal or comparison operator easier to find without splitting content inside quoted strings or comments.

Comparing queries, files and migration scripts

Paste two queries, choose two local SQL files, compare stored procedure source or review old and new migration scripts. Statement mode uses best-effort separators for common dialects and reports additions, removals, modifications and likely moves.

How SQL dialects affect comparison

PostgreSQL, MySQL, SQL Server, SQLite, Oracle, BigQuery and Snowflake use different quoting, comments and separators. The selected dialect guides local lexical handling; it does not validate database objects or runtime behavior.

Reviewing potentially destructive SQL changes

Migration review flags call attention to patterns such as DROP, TRUNCATE, GRANT, REVOKE, or DELETE and UPDATE statements without a detected WHERE clause. They are static review aids, not safety approvals.

Privacy and limitations

The tool does not execute SQL, connect to a database, compare live data, measure query performance or guarantee migration safety. Sensitive-looking literals are masked in results and exports by default, but production SQL should still be handled carefully.

SQL Compare FAQ

How do I compare two SQL queries online?

Paste the original and changed SQL, choose a comparison mode and dialect, then select Compare SQL. The comparison runs in your browser.

Is my SQL uploaded or stored?

No. Pasted SQL and selected local files stay in the current browser page. The tool does not upload, store or add SQL to a URL.

Can I compare two local SQL files?

Yes. Choose local .sql, .ddl, .dml or text files. They are read with browser file APIs only.

What is the difference between exact and formatted SQL comparison?

Exact Text compares source characters and layout. Formatted SQL compares local formatting previews to reduce indentation and keyword-case noise without changing your inputs.

Can this determine whether two queries return the same result?

No. It compares source, tokens and statements. It does not execute SQL, inspect database objects, measure performance or prove identical results.

Which SQL dialects are supported?

The local lexical comparison supports Standard SQL, PostgreSQL, MySQL or MariaDB, SQL Server, SQLite, Oracle, BigQuery and Snowflake quoting, comments and common separators. It is not a full dialect validator.

Can I compare database migration scripts?

Yes. Statement mode and Review flags help identify source changes such as DROP, TRUNCATE, GRANT, or UPDATE and DELETE statements without a detected WHERE clause.

Does the tool execute SQL or connect to a database?

No. There is no Run button, database connection, credential request, query execution or live database comparison.

What do migration review flags mean?

They are static review prompts based on SQL tokens. They can have false positives or miss context, and never determine whether a migration is safe or correct.

Are sensitive SQL values protected?

Sensitive-looking literals are masked in results and exports by default. Masking is a review aid, not a guarantee that every secret will be detected.

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