1. A method comprising: receiving, by a server computer, an image file captured by a client device, the image file comprising an associated audio component, the audio component spoken by a user of the client device as a tag of the image file; determining, by the server computer, metadata associated with the image file; identifying, by the server computer, a dictionary of potential textual tags from the metadata; determining, by the server computer, a textual tag from the audio component using the dictionary of potential textual tags in conjunction with speech-to-text technology; and associating, by the server computer, the textual tag with the image file as additional metadata.