1. A method comprising: receiving a plurality of documents, the plurality of documents including a first set of documents in a first format and a second set of documents in a second format, wherein the second format is non-image text data organized by fields and respective values; determining a schema, the schema including a plurality of categories determined based on an expected structural content in the first set of documents or second set of documents; determining indices from the plurality of categories to be used for tagging the first set of documents and the second set of documents when converted into a common format based on a review of an organizing principle to which a common set of descriptors can be identified to tag and organize images of the first set of documents and the second set of documents; converting the non-image text data of the second set of documents into images in the common format based on the determined indices, wherein the second format is removed in the conversion and content included in each image is determined based on the determined indices applying to the fields and respective values; indexing images of the first documents and the images of the second documents in the common format by associating the determined indices based on the schema with content determined from the first and second documents; and storing the images of the first set of documents and the images of the second set of documents in the common format with the indices to allow searching of both the first set of documents and the second set of documents together based on a search query.