Convert DDOC files online for free
The converter easily converts your DDOC file to various formats - free and online. No WinRAR or extra software needed.
The converter also works in reverse, so you can convert other Data formats to DDOC with high quality output.
A .DDOC file is a legacy digitally signed document container used primarily within the Estonian ID infrastructure. Historically generated by the DigiDoc Client, this format acts as a secure envelope that wraps source files (like PDF, DOCX, or TXT) alongside their digital signatures and validity certificates in an XML structure.
While secure, the .DDOC format is a common problem for modern users. It is an outdated standard (DigiDoc 2.x generation) that has been largely superseded by the BDOC and ASICE formats. Without the specific, regional ID-software installed on your machine, these files are essentially "black boxes" - you cannot view the contract or document inside. Furthermore, sending a .DDOC file to an international partner often results in confusion, as standard PDF readers and operating systems cannot process the proprietary XML wrapper.
For immediate viewing and sharing, the most practical workflow is to convert the .DDOC by extracting the internal document to a standard PDF. This removes the cryptographic wrapper, making the content accessible on any device. For long-term archiving or to maintain the legal validity of the signature in a modern system, you should convert the legacy .DDOC container to the current European standard ASICE format.
Use Convert.Guru to open and convert your DDOC file.
Users also converted DOCX, PDF, ASICE, CDOC, OXPS and TX files.
If you want to convert DDOC file to BASE64, HEX, BIN, ENC, CRYPT, AES, DES, RSA, PGP, GPG, ASC or KEY, you can use DigiDoc4 Client or similar software from the "Digital Signature Container" category. In the File menu, look for Save As… or Export….
To convert CER, BIN, PEM, DER, KEY, P7S, PFX, ENC, P12, BASE64, P7B or HEX files to DDOC, try DigiDoc4 Client or another comparable tool in the "Digital Signature Container" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our DDOC converter.