I have been working with Microsoft access and have made an immense database now need to store it online to give access to other people as well. Is there any way to convert access to web application?
To convert access to a web application, you can use share point. All you have to do is to download share point from the official Microsoft site that matches with your version of access. You then need to buy a domain name. Using that domain name you can publish your site with share point which will host all the data you have entered in access. The publication will be done automatically to the website as soon as you provide all the authentication details.
You can continue adding more data, and it will reflect online automatically.  
