hello Visakh,
You can use Microsoft's Azure Database Migration (Azure DMS) for migrating your on-prem SQL Server database to Azure SQL Database.
Some useful links below.
https://docs.microsoft.com/en-us/azure/sql-database/sql-database-migrate-your-sql-server-database
https://azure.microsoft.com/en-us/services/database-migration/?&WT.srch=1&WT.mc_id=AID631184_SEM_kZm90uWB&lnkd=Bing_Azure_Brand&msclkid=7fe9b82e568612adc09ae2485ee3ddba
Please let us know if you have any questions or run into any issues. You can submit your questions at our UserVoice below.
https://feedback.azure.com/forums/906100-azure-database-migration-service
Thanks
Raj Pochiraju
Program Manager,
Data Migration team
Microsoft