eDoc DigiSign digitally signed document
File type: Document file
An ocs file is a secured document prepared or sent with eDoc DigiSign from Fujitsu.
The format is intended for documents handled by the eDoc DigiSign platform rather than for general-purpose document viewing.
File type category:
Document file
Date updated: October 12, 2026
eDoc DigiSign is Fujitsu software for preparing and sending digitally signed documents. The ocs file extension identifies one of its native document file types.
An ocs file stores a secured document for use with eDoc DigiSign, including the document data and its associated digital-signature information. The format is proprietary to that software. Its MIME type is application/x-edocdigisign.
Because the format is closely tied to eDoc DigiSign, it is not a general-purpose document format. The file should be handled using a version of eDoc DigiSign that supports this file type.
Open the ocs file in eDoc DigiSign from Fujitsu. Use the program's open command or associate the file with the application if the operating system does not open it automatically.
General document viewers are not expected to support this proprietary digitally signed format. If eDoc DigiSign is unavailable, the sender may need to provide an exported copy in a standard document format.
If eDoc DigiSign provides an export function, use it to create a standard document copy.
Exporting or editing the document can remove or invalidate its digital signature. Keep the original ocs file when the signed document must remain verifiable.
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