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Caire

Resizes photos by removing or adding the least important parts, so key details like faces stay intact.

What it does

Caire changes the size of an image without simply squashing or cropping it. It looks for the least important strips of pixels, such as plain sky or empty background, and removes or duplicates them. This technique is called seam carving and comes from a research paper.

It can shrink or enlarge pictures in width and height, make an image square, or scale it by a percentage. An optional face detection feature spots human faces and avoids changing them. You can also give it a mask image to protect certain areas or to mark areas you want removed.

It is a command-line tool, a program you run by typing commands. It can show a preview window while it works, and it can process a whole folder of images at once. It saves to jpg, png and bmp.

Who it's for

People who want to resize photos while keeping the important content looking natural, and developers who want to add this to their own tools.

Can I use it without coding?

With some setup. You install it with Homebrew, Snap or Go and run it by typing commands, but no programming is needed. New to this? Start here.

Can I run it?

Cost
FreeNothing to pay or sign up for.
Runs on
Mac, Linux
Privacy
Runs on your own device: your data stays with you
API key
Not needed

Try it

  1. On a Mac, install it with the Homebrew package manager, or on Linux install it from the Snap store.
  2. Run it on a picture, telling it the input file, the output file and the new width or height.
  3. Add the face detection option if your photo has people in it, so faces are not distorted.
Official download page

Before you download

Plain-AyI is an independent guide: we link to each project's official pages, but we don't host, review or endorse the software, and we can't accept responsibility for how it works on your device. Please download and install at your own discretion.

Using Claude Code, Cursor or another AI coding assistant? Paste the prompt and it will walk you through the setup.New to this?

Before you install

  • Only download from the official GitHub page or the official download page above. Copies with similar names exist for many popular projects.
  • Plain-AyI is an independent guide and doesn't host or review the software it lists. Please check each project's official page before installing.
  • License (MIT): Very permissive: free to use, change and share, including for business.
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