Is there any means to resize bulk images?

Question

I have a load of image which has different sizes and dimentions, i have to resize every image within 500kb without loosing the aspect ratio of the each original image, resolution is not an issue. Could you suggest me a medium to do this task. Thank you.

P.S: I have to resize with respect to size of the image (within 500kb), not by dimentions or pixels

Answer 1

If your output images can be JPEG, you can use ImageMagick just in your Terminal. First, make an output directory, then recompress all your JPEGs, PNGs and BMPs like this:

mkdir output
magick mogrify -path output -format JPEG -define jpeg:extent=500kb *.jpg *.png *.bmp

---

If you are still using v6 ImageMagick, omit the word magick in the command above.

---

If, by "load of images", you mean thousands, use GNU Parallel:

parallel -X magick mogrify -path output -format JPEG -define jpeg:extent=500kb ::: *.jpg *.bmp *.png

---

If, by "load of images", you mean millions, use GNU Parallel:

find . -name "*.png" -print0 | parallel -0 -X magick mogrify -path output -format JPEG -define jpeg:extent=500kb