ERROR_INVALID_FORM_SIZE - 1903 (0x76F)
The specified form size is invalid.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_INVALID_FORM_SIZE error code indicates that a specified form size is invalid. This typically occurs when an application or system function receives a parameter that does not meet the expected criteria for form size.
Error Details
This error is returned by various Windows API functions, particularly those related to form handling and input validation. The specific context in which this error appears can vary depending on the function being called. For example, it might be encountered when setting a form size in a graphical user interface (GUI) application or during certain window management operations.
Usage Context
This error is commonly used by Windows API functions that require precise control over form sizes and dimensions. It serves as a mechanism to ensure that the parameters passed are within acceptable ranges, thereby preventing potential runtime errors or system instability.
Developer Interpretation
When encountering ERROR_INVALID_FORM_SIZE, developers should review the parameter values being passed to the relevant function. The error suggests that the size specified for a form does not comply with the expected constraints defined by the API. This could be due to an incorrect value, an out-of-range dimension, or a mismatch between the intended use and the actual implementation.
Related Errors
ERROR_INVALID_PARAMETER(1208): A more general error indicating that one of the supplied parameters is invalid.ERROR_BAD_LENGTH(1069): An error related to incorrect length specifications in certain API functions.
FAQ
Q: What does ERROR_INVALID_FORM_SIZE mean?
A: It indicates an invalid form size parameter was passed to a Windows API function. This typically means the specified dimensions are out of acceptable range or do not match expected constraints.
Q: How can I resolve this error?
A: Ensure that the parameters passed to the relevant function, particularly those related to form sizes, are within the valid range as defined by the API documentation.
Summary
ERROR_INVALID_FORM_SIZE is a specific parameter validation error in Windows APIs. It highlights issues with form size specifications and helps prevent runtime errors by ensuring that all parameters meet expected criteria.