Tools, libraries and web sites for Resizing Images [C#, Python, JavaScript and online tools]

Resizing images can be a chore, and even in the 2020's we still need to make smaller image files for use on websites. This post presents some options for either programmatically resizing images, or else using online resizing tools.

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Resizing programmatically

Command line [ImageMagick]

magick mogrify -resize 1600 *.jpg

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C# image resizing [stackoverflow]

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Python via the PILLOW library (replaces PIL)

python3 -m pip install Pillow

from PIL import Image

basewidth = 600

img = Image.open('fullsized_image.jpg')

wpercent = (basewidth / float(img.size[0]))

hsize = int((float(img.size[1]) * float(wpercent)))

img = img.resize((basewidth, hsize), Image.ANTIALIAS)

img.save('resized_image.jpg')

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JavaScript (TypeScript) on Node.js - Use the sharp npm package.

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Resizing via online tools

If you are not too worried about the IP or privacy of your images, then there are some free online tools that provide an image resizing service.

zamzar.com is a file conversion service, but can also be used to reduce large images to a more reasonable size.

websiteplanet.com has an online image compressor tool. This tools allows you to compress both jpeg and png files and each picture can be up to 50 MB in size.

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note: the author has no affiliation to the above tools and websites - am simply sharing, in case it is of use...