SQL Escape Tool
Escape or unescape SQL string literals. Prevent SQL injection by properly escaping quotes and special characters.
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What is SQL Escaping?
SQL escaping is the process of converting special characters in string literals to their SQL-safe representations. The most critical character to escape in SQL is the single quote ('), which is used to delimit string values. A single quote inside a string is typically escaped by doubling it ('') in standard SQL, or by using a backslash (\') in MySQL with NO_BACKSLASH_ESCAPES disabled.
For example, the name John O'Brien becomes 'John O''Brien' when properly escaped as a SQL string literal.
SQL Escape Methods by Database
| Database | Quote Escape | Backslash Escape | Notes |
|---|---|---|---|
| PostgreSQL | '' | N/A (standard) | Uses standard SQL escaping |
| MySQL | '' or \' | \\ | Backslash escaping by default |
| SQLite | '' | N/A (standard) | Follows standard SQL |
| SQL Server | '' | N/A | Standard SQL only |
| Oracle | '' | N/A | Standard SQL only |
How to Use This SQL Escape Tool
- Escape — Type or paste SQL string content into the left panel, then click Escape to convert special characters to SQL-safe sequences.
- Unescape — Type or paste escaped SQL content into the right panel, then click Unescape to revert escape sequences to their actual characters.
- Options — Toggle Escape backslashes for MySQL mode, or Wrap in single quotes to surround the output with quotes.
- Swap & Clear — Click Swap to exchange escape/unescape values, Clear All to reset everything.
Common Use Cases
- SQL injection prevention — Always escape string values containing user input before building SQL queries to prevent SQL injection attacks.
- Dynamic query building — Properly escape strings when constructing dynamic SQL queries in application code.
- Database migration scripts — Ensure string data with special characters is correctly escaped in SQL migration files.
- Debugging SQL logs — Unescape escaped SQL strings in database logs to read the actual query content.
- Data import/export — Escape strings containing quotes, backslashes, and control characters when preparing SQL dump files.
Frequently Asked Questions
What characters need escaping in SQL strings?
The single quote (') must always be escaped in SQL string literals by doubling it (''). In MySQL (with default settings), the backslash (\\), double quote ("), and control characters like newline (\n) and tab (\t) are also escaped with a backslash prefix.
Should I use parameterized queries instead of escaping?
Yes! Parameterized queries (prepared statements) are the recommended way to prevent SQL injection. Escaping is a fallback for cases where parameterized queries aren't possible, such as dynamic SQL or when building queries in code that doesn't support prepared statements.
What is the difference between standard SQL and MySQL escaping?
Standard SQL (used by PostgreSQL, SQLite, SQL Server, Oracle) only escapes single quotes by doubling them (''). MySQL, by default, also treats backslash as an escape character, so \', \\, \n, etc. are recognized. This tool's Escape backslashes option enables MySQL-compatible escaping.
Does escaping prevent all SQL injection?
No. Escaping string values only protects string literals. SQL injection can also occur through other query parts (identifiers, numbers, keywords). Always validate and sanitize all user input, use parameterized queries, and follow the principle of least privilege for database accounts.
What about double quotes in SQL?
In standard SQL, double quotes are used to delimit identifiers (column names, table names), not string values. MySQL can use double quotes for strings when ANSI_QUOTES mode is disabled. This tool focuses on single-quoted string literals, the most common case.
