Regardless of whether you are dealing with an online or an email application, you should always have important documents at hand and keep them as a scanned copy. This includes either work, university, or school certificates, as well as other files which you consider an essential element of your application. Online applications often require you to limit the total size of your files to a max. of 10 MB. The internet provides free tools which allow you to reduce the size of your documents. It is also possible to merge multiple PDF files, with the result that you only send a single document and thus save time.