How to open an .adoc file
An .adoc file is a signed document from Lithuania. Here is how to open it, and what the OkoSign checker can and cannot read.
Updated 8 November 2026
What an .adoc file is
An .adoc file is a format for signed documents used in Lithuania, made by the Lithuanian e-signature tools.
How to open it
Open it with the Lithuanian e-signature tools, which are free. They show the documents inside and who signed. Other signed packages, such as .asice files, open in DigiDoc4.
Can OkoSign check it?
The checker reads .pdf, .asice and .edoc files today. Try your .adoc: if it holds a standard signed package, you will see the signatures. If not, the checker says so, and nothing is kept.