Resize Photos Without Photoshop
Your Mac has a built-in tool called sips that can resize images from Terminal.
Resize a Single Image
1
Resize to max width of 1200px (keeps aspect ratio):
sips --resampleWidth 1200 photo.jpg
Resize All Images in a Folder
1
Resize all JPGs to max 1200px wide:
sips --resampleWidth 1200 *.jpg
That's it. 100 photos resized in seconds.
Key Takeaway
sips is Mac's built-in image tool. Use --resampleWidth to resize images instantly.