Click the "Select File" button above, and choose your DEC file.
You’ll see a preview, if available.
Click the "Convert file to..." button to extract text information.
Convert DEC to another file type
To convert DEC Declarations or games to another format, you need Agencia Tributaria or other Data software.
Convert a file to DEC
To convert other file formats to the "Tax Declaration File" file type, you need software like Agencia Tributaria or a similar tool.
About DEC files
The .DEC file extension is highly fragmented, most commonly functioning as tax declaration files for government agencies in Brazil (Receita Federal), Spain (Agencia Tributaria), and Mexico (SAT). It is also utilized for decrypted Nintendo Wii game images by the Dolphin Emulator, and occasionally as compressed data or serialized .NET objects. These government tax files are heavily restricted. They usually contain structured financial data compressed via zlib or ZIP, or protected with certificates. You cannot open these files in a standard text editor or web browser. Because they are proprietary and sometimes encrypted, you must use the official government software to view or print them as PDF. Standard online converters fail to process .DEC files because they lack the specific parsing logic or decryption keys required by the issuing authority. Converting a Spanish or Brazilian tax return directly without the official software usually results in unreadable garbage data. Our system analyzes the binary signature. If the .DEC file is a standard BZ2 or ZIP archive under the hood, we can often extract the internal XML or text data. If it is a decrypted Wii image, we will identify it so you know to use specialized emulator tools.
Convert.Guru analyzes your DEC file, detects the exact format, and lets you read the text inside.
If you want to convert DEC file to JS, TS, PY, JAVA, CPP, C, CS, PHP, RB, GO, RS or SWIFT, you can use Agencia Tributaria or similar software from the "Tax Declaration Data Storage" category. In the File menu, look for Save As… or Export….
To convert SH, PY, KT, PS1, SWIFT, LUA, PL, JAVA, SCALA, JS, VBS or TS files to DEC, try Agencia Tributaria or another comparable tool in the "Tax Declaration Data Storage" category.
The DEC 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 DEC converter.