# How to open an .adoc file

> You are reading the Markdown version of https://okosign.com/en/guides/open-adoc-file, at https://okosign.com/en/guides/open-adoc-file.md. Every page of okosign.com has one: its address plus .md (the home’s is /index.md).

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.

## Check your file

[Check a file now](https://app.okosign.com/check)

## More guides

- [How to open an .edoc file](https://okosign.com/en/guides/open-edoc-file)
- [How to open an .asice file](https://okosign.com/en/guides/open-asice-file)
- [How to sign a document with Smart-ID](https://okosign.com/en/guides/sign-with-smart-id)
- [Is a Smart-ID signature legally valid?](https://okosign.com/en/guides/is-smart-id-signature-valid)
- [How to check a signed file](https://okosign.com/en/guides/check-signed-file)
- [What is a qualified electronic signature?](https://okosign.com/en/guides/qualified-electronic-signature)
- [How to send a document for signing](https://okosign.com/en/guides/send-document-for-signing)
- [How to sign with an ID card](https://okosign.com/en/guides/sign-with-id-card)
- [Smart-ID or eParaksts: which to use](https://okosign.com/en/compare/smart-id-or-eparaksts)

---

The page for people: https://okosign.com/en/guides/open-adoc-file