Skip to main content
Join the official 2019 Python Developers SurveyStart the survey!

Python bindings for WebP

Project description

WebP Python bindings

CircleCI license GitHub


pip install webp


  • libwebp (tested with v1.0.3)
    • Install libwebpmux and libwebpdemux components as well.
    • Check out the Dockerfile for steps to build from source on Ubuntu.
  • Python 3 (tested with v3.6)
  • cffi (tested with 1.10.0)
  • Pillow (tested with v4.1.1)
  • numpy (tested with v1.12.1)


import webp

Simple API

# Save an image
webp.save_image(img, 'image.webp', quality=80)

# Load an image
img = webp.load_image('image.webp', 'RGBA')

# Save an animation
webp.save_images(imgs, 'anim.webp', fps=10, lossless=True)

# Load an animation
imgs = webp.load_images('anim.webp', 'RGB', fps=10)

If you prefer working with numpy arrays, use the functions imwrite, imread, mimwrite, and mimread instead.

Advanced API

# Encode a PIL image to WebP in memory, with encoder hints
pic = webp.WebPPicture.from_pil(img)
config =, quality=70)
buf = pic.encode(config).buffer()

# Read a WebP file and decode to a BGR numpy array
with open('image.webp', 'rb') as f:
  webp_data = webp.WebPData.from_buffer(
  arr = webp_data.decode(color_mode=WebPColorMode.BGR)

# Save an animation
enc =, height)
timestamp_ms = 0
for img in imgs:
  pic = webp.WebPPicture.from_pil(img)
  enc.encode_frame(pic, timestamp_ms)
  timestamp_ms += 250
anim_data = enc.assemble(timestamp_ms)
with open('anim.webp', 'wb') as f:

# Load an animation
with open('anim.webp', 'rb') as f:
  webp_data = webp.WebPData.from_buffer(
  dec =
  for arr, timestamp_ms in dec.frames():
    # `arr` contains decoded pixels for the frame
    # `timestamp_ms` contains the _end_ time of the frame


  • Picture encoding/decoding
  • Animation encoding/decoding
  • Automatic memory management
  • Simple API for working with PIL.Image objects

Not implemented

  • Encoding/decoding still images in YUV color mode
  • Advanced muxing/demuxing (color profiles, etc.)
  • Expose all useful fields

Developer notes

Running tests

The CircleCI local CLI should be used to run tests in an isolated environment:

$ circleci local execute

Known issues

  • An animation where all frames are identical will "collapse" in on itself, resulting in a single frame. Unfortunately, WebP seems to discard timestamp information in this case, which breaks webp.load_images when the FPS is specified.

Project details

Download files

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

Files for webp, version 0.1.0a15
Filename, size File type Python version Upload date Hashes
Filename, size webp-0.1.0a15.tar.gz (9.5 kB) File type Source Python version None Upload date Hashes View hashes

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging AWS AWS Cloud computing DataDog DataDog Monitoring Fastly Fastly CDN SignalFx SignalFx Supporter DigiCert DigiCert EV certificate StatusPage StatusPage Status page