Extract text from compressed NumPy array archives (NPZ)
To convert NPZ NumPy archives to another format, you need NumPy or other Data software.
To convert other file formats to the "NumPy Array Archive" file type, you need software like NumPy or a similar tool.
The .NPZ file format is a compressed archive containing multiple NPY files, which store multi-dimensional arrays for the NumPy library in Python. These files are extensively used in data science, machine learning, and scientific computing to save and load complex numerical datasets efficiently. The primary tool to open and manipulate these files is the NumPy package, exclusively within a Python environment.
The main disadvantage of the .NPZ format is its opaque binary nature. You cannot open it natively in standard spreadsheet software like Microsoft Excel or view it in a text editor. Accessing the data requires writing Python code. Furthermore, if the arrays are multi-dimensional (3D tensors or higher), interpreting the data outside of specialized scientific software becomes extremely difficult.
To make the data accessible to non-developers, you must convert .NPZ files to standard formats. CSV is the ideal target for 2D tabular data, while JSON works well for lightweight nested structures. For massive datasets, HDF5 is a far superior, robust alternative. Keep in mind that converting high-dimensional arrays to flat formats like CSV will result in structural data loss.
This format is notoriously difficult to convert online because it is deeply tied to Python's internal memory representation of matrices. Standard online converters typically fail to process it. However, because an .NPZ file is fundamentally a standard ZIP archive containing underlying NPY files, convert.guru can still identify the file format, inspect the ZIP structure, and show the internal content. Just drag and drop your file to identify the format, view it, and convert it when possible.
Convert.Guru analyzes your NPZ file, detects the exact format, and lets you read the text inside.
Users also converted NPY, ZIP, DLT, UNL, TSX, ZI_, NZB, DOCX, MAT, SPC, F3D, GRAPHML and HIF files.
If you want to convert NPZ file to CSV, NPY, IMAGE, MAT, DICT, TXT, PKL or HDF5, you can use NumPy or similar software from the "Multi-dimensional array storage" category. In the File menu, look for Save As… or Export….
To convert files to NPZ, try NumPy or another comparable tool in the "Multi-dimensional array storage" 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 NPZ converter.