Idchecker

Idchecker is an ID verification tool specifically designed for mainland Chinese ID numbers. It provides the following features:
1.Legitimacy Verification: Checks the length, format, and characters of the ID number to ensure it complies with national standards.
2.Region Code Identification: Based on mainland China administrative division codes, it identifies the first six digits to provide detailed province, city, and district information.
3.Checksum Calculation: Automatically calculates the check digit for the 17-digit prefix and compares it with the 18th digit to determine validity.
4.Error Handling: Provides detailed error messages for common input issues, such as illegal characters, checksum mismatches, or invalid region codes.
5.Privacy Protection: The app operates entirely offline. All processing is done locally on your device; no personal information is collected, stored, or shared, ensuring data security.

Use Cases:
Verify the validity of an ID number to ensure accuracy.
Identify the geographic region and view detailed provincial and local information.
Check ID number formats and checksums to ensure legal compliance.