Enter all the desired criteria: the apps that satisfy them all will be searched; if a criterion is specified multiple times, only the last occurrence will be considered.
Then the app will ask you to upload the file you want to modify. Once this operation is completed, the following screen will appear. At this point you will need to decide what kind of operation to do among those provided by KeepVid. For example to convert a video it is necessary indicate the output format and the resolution, then click on "start now". Once the conversion is done, it is possible to download the final file, ready to be used on the target device or share it on YouTube or Vimeo. 
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