A user can proof (e.g., view, review) an electronic publication on a portable device. When the user finds errors in the electronic publication on the portable device, the user can edit the electronic publication on the editing device. The changes can be automatically synchronized with the portable device and displayed so that the user can review the changes and continue proofing the electronic publication on the portable device. In some implementations, an editing device can monitor files associated with an electronic publication for changes to the files and, when changes are detected, the files can be automatically synchronized to a portable device coupled to the editing device.