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I've been working on images for a website and find out that .webp format is much more compact than .jpeg or .png find more on Docs.

Now I have a folder with almost 25 images & I want to convert all into .webp format. Can anyone suggest me how to convert all by using just a python script without using online tools.

Pankaj Kumar Gautam
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1 Answers1

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Well first of all you have to download the cwebp compressor tool according to your machine(Windows|Linux) from here.

Now after extracting the folder in C:\Program Files\ you have to set path to cwebp.exe, below is my path Path:: C:\Program Files\libwebp\bin

Open cmd to check if you have done right till now.

  • cmd> cwebp -version

cwebp- version

  • cmd> python --version

python --version

Now it's super easy just run the below script and you have your desired output or you can download my repo on github from here

# --cwebp_compressor.py--

# cmd> python cwebp_compressor.py folder-name 80

import sys
from subprocess import call
from glob import glob

#folder-name
path = sys.argv[1]
#quality of produced .webp images [0-100]
quality = sys.argv[2]

if int(quality) < 0 or int(quality) > 100:
    print("image quality out of range[0-100] ;/:/")
    sys.exit(0)

img_list = []
for img_name in glob(path+'/*'):
    # one can use more image types(bmp,tiff,gif)
    if img_name.endswith(".jpg") or img_name.endswith(".png") or img_name.endswith(".jpeg"):
        # extract images name(image_name.[jpg|png]) from the full path
        img_list.append(img_name.split('\\')[-1])


# print(img_list)   # for debug
for img_name in img_list:
    # though the chances are very less but be very careful when modifying the below code
    cmd='cwebp \"'+path+'/'+img_name+'\" -q '+quality+' -o \"'+path+'/'+(img_name.split('.')[0])+'.webp\"'
    # running the above command
    call(cmd, shell=False)  
    # print(cmd)    # for debug
Pankaj Kumar Gautam
  • 303
  • 2
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  • Why not run it with both -near_lossless 80 and the lossy, and then take the smaller? – Jyrki Alakuijala Apr 03 '19 at 19:48
  • @JyrkiAlakuijala well when I started with webp conversion I found it tidious to convert all 25 images one-by-one one.....the above code is more on conversion for batch images....well you can do this in your code...nice idea – Pankaj Kumar Gautam Apr 03 '19 at 20:01
  • I had to change `call(cmd, shell=False)` to `call(cmd, shell=True)` because we are passing a shell command. [reference](https://stackoverflow.com/a/18962815/3578289). – eMad Mar 18 '21 at 22:06
  • Thanks! I modified it to my needs (use with shell, save files in separate folder). Works well! My version: https://gist.github.com/apiwonska/d2a0938fc68909e14f83876e72a55325 – ann.piv Dec 15 '21 at 19:20