Click the "Select File" button above, and choose your ZFO file.
You’ll see a preview, if available.
Click the "Convert file to..." button to extract text information.
Convert ZFO to another file type
To convert your ZFO file to another format, you need Software602 Form Filler or other Page Layout software.
Convert a file to ZFO
To convert other file formats to the "Electronic Form Container" file type, you need software like Software602 Form Filler or a similar tool.
About ZFO files
A .ZFO file is a specialized encrypted container used primarily for official communication with the Czech Government via the Data Box System (Datová schránka). These files function as secure envelopes that hold electronic forms, signed messages, and attachments. Internally, a .ZFO is often a ZIP-compressed archive containing XML data and XSL-FO (Extensible Stylesheet Language Formatting Objects) definitions, which dictate how the form renders visually.
Users typically encounter these files when dealing with tax returns, legal notices, or official correspondence in the Czech Republic. The primary challenge is that .ZFO files are proprietary and cannot be opened by standard PDF readers like Adobe Acrobat or web browsers. To view them, users must install the specific Software602 Form Filler or log into the government portal. Furthermore, Data Box messages are often automatically deleted from the server after 90 days, making local archiving essential.
For Archiving and Printing, the best solution is converting the .ZFO to PDF/A, which preserves the visual layout and signature validity permanently. For Data Processing, converting to XML allows you to extract the raw form data. If you simply need to access enclosed files, the archive can often be treated as a ZIP file to extract attachments.
Convert.Guru analyzes your ZFO file, detects the exact format, and lets you read the text inside.
If you want to convert ZFO file to PDF, HTML, HTM, CSS, JS, PHP, ASP, ASPX, JSP, JSPX, PY or RB, you can use Software602 Form Filler or similar software from the "Czech Government Communication" category. In the File menu, look for Save As… or Export….
To convert RSS, CSS, CGI, SITEMAP, PL, WEBMANIFEST, JSON, JS, XML, HTML, ICO or HTM files to ZFO, try Software602 Form Filler or another comparable tool in the "Czech Government Communication" category.
The ZFO Converter Story
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 ZFO converter.