CloudConvert is a free app to convert files on your iPhone or iPad.
The app supports more than 180 different file formats, and allows you to convert images, video, audio, documents, and more. You can convert files by selecting them from your camera roll or importing them from Dropbox or Google Drive.
ClourdConvert supports the 'Open in...' function in iOS, meaning you can quickly convert files that you receive as email attachments.
CloudConvert makes it simple to convert files on your iOS device.