Skip to main content

PDF417 2D barcode generator for Python

Project description

PDF417 barcode generator for Python

.. image::
.. image::
.. image::
.. image::

Easily encode your data into a 2D barcode using the PDF417 format.

.. image::

Licensed under the MIT License, see `LICENSE <LICENSE>`_.


Install using pip:

.. code-block::

pip install pdf417gen


The ``pdf417gen`` command can be used to generate a barcode from commandline. It
takes the input either as an argument or from stdin.

.. code-block:: bash

# Show help
pdf417gen encode --help

# Encode given text and display the barcode
pdf417gen encode "Beautiful is better than ugly"

# Encode given text and save barcode to a file (extension determines format)
pdf417gen encode -o barcode.png "Explicit is better than implicit"

# Input from a file
pdf417gen encode < input.txt

# Piped input
python -c "import this" | pdf417gen encode


Creating bar codes is done in two steps:

* Encode a string to a list of code words using ``encode()``
* Render the barcode using one of the rendering functions: ``render_image()``,

Usage overview:

.. code-block:: python

from pdf417gen import encode, render_image, render_svg

# Some data to encode
text = """Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated."""

# Convert to code words
codes = encode(text)

# Generate barcode as image
image = render_image(codes) # Pillow Image object'barcode.jpg')

# Generate barcode as SVG
svg = render_svg(codes) # ElementTree object

Supports strings (unicode in py2) and byte arrays (str in py2):

.. code-block:: python

# These two inputs encode to the same code words
encode(u"love 💔")
encode(b"love \xf0\x9f\x92\x94")

# Default encoding is UTF-8, but you can specify your own
encode(u"love 💔", encoding="utf-8")

Encoding data

The first step is to encode your data to a list of code words.

.. code-block:: python

encode(data, columns=6, security_level=2)


The bar code size can be customized by defining the number of columns used to
render the data, between 1 and 30, the default value is 6. A bar code can have a
maximum of 90 rows, so for larger data sets you may need to increase the number
of columns to decrease the rows count.

.. code-block:: python

codes = encode(text, columns=12)
image = render_image(codes)

.. image::

Security level

Increasing the security level will produce stronger (and more numerous) error
correction codes, making the bar code larger, but less prone to corruption. The
security level can range from 0 to 8, and procuces ``2^(level+1)`` error
correction code words, meaning level 0 produces 2 code words and level 8
produces 512. The default security level is 2.

.. code-block:: python

codes = encode(text, columns=12, security_level=6)
image = render_image(codes)

.. image::

Auto Numeric Compaction Mode

This mode can pack almost 3 digits (2.93) info a symbol character.
The words with length less 13 symbols will be invoked as Text

.. code-block:: python

codes = encode(text, numeric_compaction=True)

Render image

The ``render_image`` function takes the following options:

* ``scale`` - module width, in pixels (default: 3)
* ``ratio`` - module height to width ratio (default: 3)
* ``padding`` - image padding, in pixels (default: 20)
* ``fg_color`` - foreground color (default: ``#000000``)
* ``bg_color`` - background color (default: ``#FFFFFF``)

.. note::

A module is the smallest element of a barcode, analogous to a pixel. Modules
in a PDF417 bar code are tall and narrow.

The function returns a Pillow Image_ object containing the barcode.

Colors can be specified as hex codes or using HTML color names.

.. code-block:: python

codes = encode(text, columns=3)
image = render_image(codes, scale=5, ratio=2, padding=5, fg_color="Indigo", bg_color="#ddd")

.. image::

Render SVG

The ``render_svg`` function takes the following options:

* ``scale`` - module width, in pixels (default: 3)
* ``ratio`` - module height to width ratio (default: 3)
* ``padding`` - image padding, in pixels (default: 20)
* ``color`` - foreground color (default: `#000000`)

The function returns a ElementTree_ object containing the barcode in SVG format.

Unlike ``render_image``, this function does not take a background color option.
The background is left transparent.

.. code-block:: python

codes = encode(text, columns=3)
svg = render_svg(codes, scale=5, ratio=2, color="Seaweed")

## See also

* pdf417-php_ - a PHP implementation
* golang-pdf417_ - a Go implementation
* Specifications_ - USS-PDF-417

.. _pdf417-php:
.. _golang-pdf417:
.. _ElementTree:
.. _Image:
.. _Specifications:

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

pdf417-0.7.0.tar.gz (23.1 kB view hashes)

Uploaded source

Supported by

AWS AWS Cloud computing Datadog Datadog Monitoring Facebook / Instagram Facebook / Instagram PSF Sponsor Fastly Fastly CDN Google Google Object Storage and Download Analytics Huawei Huawei PSF Sponsor Microsoft Microsoft PSF Sponsor NVIDIA NVIDIA PSF Sponsor Pingdom Pingdom Monitoring Salesforce Salesforce PSF Sponsor Sentry Sentry Error logging StatusPage StatusPage Status page