Opening CDOC Files

The CDOC file type is primarily associated with DigiDoc Client.

CDOC	File extension: CDOC
	File type:	encrypted digital document file

What is a CDOC file?

CDOC files mostly belong to DigiDoc Client. CDOC files come in two main types. The first type is an XML-based encrypted file used in Estonia for secure digital documents. This file uses an internal XML structure and is managed by DigiDoc Client. It supports digital signatures and encryption to ensure the document's integrity and authenticity. You can visit the official website at id.ee for more technical details and to download the compatible software.
The second type is known as a Clicker document. These files, sometimes labeled as Clicker 5 or Clicker 8 documents, are associated with Clicker software. They serve as proprietary documents that may support interactive or editable content. More information on this variant is available at us.cricksoft.com.
Tips for handling CDOC files:

If the file content starts with an XML declaration (like <?xml ...>), it is likely an encrypted document used with DigiDoc Client.

Use the corresponding software (DigiDoc Client for encrypted files or Clicker for Clicker documents) to open and verify the file.

You can also open these files in a text editor to inspect their structure if you are unsure of the format.

How to open CDOC files

You need a suitable software like DigiDoc Client to open a CDOC file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your CDOC file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a CDOC file directly in the browser:. Just drag the file onto this browser window and drop it.

Online CDOC Text Viewer

Choose your .cdoc file to analyze

or drag and drop it here

Online File Viewer

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Programs that open and convert CDOC files:

DigiDoc Client
See the previous paragraphs to learn more about the main application. CDOC files are often referred to as DigiDoc Client encodeds because this type of file is primarily created or used by this software.
DigiDoc Client / Clicker 7
The *.CDOC file extension is primarily associated with two distinct file formats. The most prevalent format, comprising 69% of observed *.CDOC files, is used by the DigiDoc Client software for Estonian encrypted documents. These files employ XML for their internal structure. Less commonly, representing 26% of instances, *.CDOC refers to Clicker 5 documents, utilized by the Clicker 7 and Clicker 8 software. This file format is classified as Encrypted Document / Assistive Technology Document.

CDOC format details:

The file format determines how the data is stored in the file. A file format is determined by the file extension and signature, so JPEG images have the extension .jpg and the first bytes in the file are ÿØÿ. If the file extension does not match the file format, double-clicking on the file will cause an error upon opening. When there is a problem with a file, the first step to solving it is to determine the file format. Our evaluation of the CDOC files looks like this:

The CDOC file extension is rarely used and mainly uses a special format. However, the following two file formats are common:

80% of all CDOC files use the popular XML file format. The Extensible Markup Language (XML) is a simple text-based format for representing structured information: documents, webpages, data, configuration, books, transactions, invoices, and much more. XML defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. The contents of these files are easily readable with a text editor. The average file size is 280 KB with most files being between 58 KB and 1 MB in size. The file type is relatively new. Certain words are almost always found in the files, such as <denc:EncryptedData xmlns:denc="http://www.w3.org/2001/04/xmlenc#" MimeType="application/octet-stream">, <denc:EncryptionMethod Algorithm="http://www.w3.org/2 and <?xml version="1.0" encoding="UTF-8"?>. Files like these are about teade, kauba, avamisest, document, patient, nnit and pola, and often consist of personal data.
15% of all CDOC files have the same signature ------=_Part_. These files are text files and can therefore be read using a text editor. CDOC files are between 3 KB and 660 KB in size. The following keywords are characteristic: ------, Part, <head>, <html>, Content-Type: text/html, <style type=3D"text/css">, Content-Transfer-Encoding: quoted-printable and body { font-family. Files like these are about mars, sentences and mission.

All the rest of the CDOC files (5%) have different formats. Just click the "Choose your .cdoc file to analyze" button on this page to find out what your CDOC file is.

Technical Data for CDOC File Extension

File classification:

Encoded

Related files:

bdoc, asic, p7m, xades, ddoc, clkx, cll, pdf, doc, docx, xml

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: CDOC
EXEFile: %ProgramFiles%\DigiDoc\digidoc.exe

a cdoc encrypted digital document file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with CDOC files

Associate the CDOC file extension with the correct application.
Update your software that should actually open encrypted digital document files. Because only the current version supports the latest CDOC file format. Search, therefore, e.g. on the manufacturer website after an available DigiDoc Client update.
To make sure that your CDOC file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .CDOC file online - secure, fast, and no downloads needed.