Bahrain provides online for submitting visa extension applications:

Online Application
Access the NPRA Portal: Visit the official NPRA website and navigate to the visa extension section.
Complete the Application Form: Enter all required personal and travel details accurately.
Upload Necessary Documents: Attach scanned copies of the required documents.
Pay the Applicable Fees: Use the secure online payment system to pay the extension fees.
Submit the Application: Review all information for accuracy before submission.
Applicants will receive a confirmation email upon successful submission, and the processing time typically spans a few working days.

Read also: status check