You can search images in your Dropbox account based on the content in them. For example, you can search for “clothing” to see all images of clothing (and images related to clothing) in your Dropbox account—even if “clothing” isn’t in the file name.
To search images on dropbox.com or the Dropbox desktop app:
You can search the following image file types:
Your Dropbox account must be set to the language you’re searching in, except for English searches, which work with any language setting.
Images can be searched in the following languages:
Similar to text content search, when you upload a supported image filetype, content is identified in the image. When you search a keyword, results are displayed that contain content matching that keyword, or related to that keyword. This information is only used to improve retrieval of files in your account.