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Open a .ddoc file online

DDOC was Estonia's first digital signature format. New .ddoc files are no longer created, but old contracts and decisions will need to be opened for years. Drop the file here.

Your file never leaves your deviceFree, no account

What is a .ddoc file?

DDOC, or DIGIDOC-XML, is the Estonian digital signature format introduced in the early 2000s. Unlike newer formats, a .ddoc is not a ZIP archive but a single XML file: the documents are embedded in Base64 inside DataFile elements and the signatures sit in Signature elements.

Because DDOC relies on the outdated SHA-1 hash algorithm, new signatures can no longer be created in this format. Existing files can still be opened. ASiCE Viewer reads the DDOC file right in the browser, shows the signers and lets you download the documents.

DDOC (.ddoc)
File extension.ddoc
SpecificationDIGIDOC-XML 1.3
StructureXML file with Base64-embedded documents
Hash algorithmSHA-1
Used inEstonia
StatusNo longer created; existing files can be opened

How to open a .ddoc file

  1. Choose the file

    Drop the file into the box on this page, or press the box and pick a file from your computer, phone or tablet.

  2. Read the documents

    The container is unpacked in your browser. PDF, Word, Excel, image and text files open in the preview straight away.

  3. Check signatures and download

    See each signer's name and signing time, and download the files one by one or all at once.

Opening the file on a computer and on a phone

Windows, macOS and Linux: open asiceviewer.com in a browser and drop the file onto the page. If you need an official validity confirmation, open the same file in the DigiDoc4 client too.

Android: open the page in Chrome and pick the file from Downloads, or install the ASiC-E Viewer app, which also opens files offline.

iPhone and iPad: save the attachment to the Files app, open asiceviewer.com in Safari and choose the file from there.

ASiC-E Viewer app icon

ASiC-E Viewer for Android

Open signed containers on your phone, even offline. See the signature details and export documents to PDF or Word.

  • Works offline
  • .asice · .bdoc · .edoc · .adoc · .p7s
  • Export to PDF and DOCX
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Questions about .ddoc files

Can .ddoc files still be opened?

Yes. Drop the file onto this page or open it in the DigiDoc4 client. Either way you see the documents and the signers.

Why can't .ddoc files be created any more?

DDOC uses the SHA-1 hash algorithm, which is no longer considered secure enough. New signatures are created in the .asice format.

How do I get the document out of a .ddoc file?

Open the file here, choose the document on the left and press the download button. The file is decoded in your browser exactly as it was.

Why is my .ddoc inside an .asics container?

Old DDOC files are re-time-stamped to preserve their evidential value. The DDOC is placed in an ASiC-S container together with a time stamp. ASiCE Viewer opens both.

Other supported formats