The following operations are for use only in rare, specific situations and should not be used for general troubleshooting. In many cases, resetting will cause additional problems. Before using any of these options, please ask for help on the Zotero forums.

By default, the Zotero sync process merges data between the Zotero desktop client and the Zotero server. In certain rare situations, Zotero's record of previous syncing may become corrupted, leading to sync errors or changes to items not being detected. These errors can be corrected by resetting your Zotero sync history, which force Zotero to check each of items or files for changes and sync them.

If the Zotero sync icon is spinning and you're trying to fix it, do not use the reset options. Instead, wait for the sync to finish or report the problem on the Zotero forums.

Before using any options on this page, make sure to first back up your Zotero library.

If changes made to an item are not being detected and synced on your computer, this option will reset the item data syncing history between your local Zotero database and the Zotero servers. This will merge your local data with the remote data on the Zotero servers, ignoring any existing sync history (i.e., the data in both locations will be merged).

If changes made to attachment files are not being synced (e.g., edits, annotations, deleting an attachment, adding a new attachment), this option will reset the file syncing history between your local Zotero database and your storage service (either the Zotero servers or your WebDAV provider). This will cause Zotero to compare all attachment files on your local computer with the ones on your storage service, making the most recent changes to files.

If you have made changes to your local Zotero database that you wish to undo, and these changes have not yet synced with the Zotero servers, see Restoring from Backup. Note that this is unlikely if you have automatic sync enabled and an active internet connection.

If you have made changes that have already synced with the Zotero servers (or you made them on zotero.org), disable automatic syncing and ask for help on the Zotero forums.

Before using any options on this page, make sure to first back up your Zotero library.