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Writing large ZIP archives without memory inflation
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Buzon - ZipFly

ZipFly is a zip archive generator based on It was created by to generate very large ZIP archives for immediate sending out to clients, or for writing large ZIP archives without memory inflation.


Python 3.6+


pip3 install zipfly

Basic usage, compress on-the-fly during writes

Basic use case is compressing on the fly. Some data will be buffered by the zipfile deflater, but memory inflation is going to be very constrained. Data will be written to destination at fairly regular intervals.

ZipFly defaults arguments:

  • paths: [ ]
  • mode: (write) w
  • chunksize: (bytes) 16384
  • compression: Stored
  • allowZip64: True
  • compresslevel: None
  • storesize: (bytes) 0

paths list of dictionaries:

fs Should be the path to a file on the filesystem
n (Optional) Is the name which it will have within the archive
(by default, this will be the same as fs)

    import zipfly

    paths = [
            'fs': '/path/to/large/file'

    zfly = zipfly.ZipFly( paths = paths )

    generator = zfly.generator()
    print (generator)
    # <generator object ZipFly.generator at 0x7f74d52bcc50>

    with open("", "wb") as f:
        for i in generator:


Streaming multiple files in a zip with Django or Flask Send forth large files to clients with the most popular frameworks

Create paths Easy way to create the array paths from a parent folder.

Predict the size of the zip file before creating it Use the BufferPredictionSize to compute the correct size of the resulting archive before creating it.

Streaming a large file Efficient way to read a single very large binary file in python

Set a comment Your own comment in the zip file


Santiago Debus (

Santiago's open-source projects are supported by his Patreon. If you found this project helpful, any monetary contributions to the Patreon are appreciated and will be put to good creative use.


This library was created by and is released under the MIT. Copyright 2020 Grow HQ, Inc.

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