Systems and methods for extracting audiovisual features from online document elements are described herein. A computing device can identify a first audiovisual content element on an online document and can retrieve a second audiovisual content element from a content provider database. The computing device can extract an image, video, or audio feature from the first and the second audiovisual content elements by applying image feature, video frame feature, or audio fingerprint detection. The computing device can determine a match between the features extracted from the first and the second audiovisual content elements. The computing device can select the second audiovisual content element for display on the online document based on the match. The computing device can transmit the second audiovisual content element for insertion in a content slot of the online document.