Ability to resize by setting a maximum resolution or width/height

[nekohayo]

To be an alternative to GIMP or squoosh.app for web assets preparation (which are painful because both of those tools do not do batch encoding, and managing files one by one is a huge pain), I would need the ability to resize down the images' resolution at the same time as we are compressing them, in batch. Essentially tell the app "this is the maximum dimension I want in width or height, figure it out while preserving aspect ratio"

[MoonlightWave-12]

When i want to share/upload/send some photos (in JPG-format), they usually have a very high resolution (>3840x2160).
So i usually resize them to a smaller resolution (with linear interpolation), to make the filesize much smaller.
It would be nice if Curtail could do both in one step, so i don't need 2 apps to make the filesize of my images small enough.

An example:
The difference in filesize between an image with original resolution (about 4600 x 3450) and a resized image (2880 x 2160), after using Curtail to compress both images (lossy) as JPG with quality set to 90:
2.0 MB and 820 KB.
The image-quality was almost identical when displayed at the same display-size (that is not larger than the smaller image).

---

I think an option to reduce (but never increase) image-resolution to a chosen maximum resolution for the shortest side of the image, would be a good and simple setting.
Using the shortest side basically lets one choose the amount of detail to keep.
The aspect-ratio should always be the original aspect-ratio.

I think an on/off-toggle and a number-input-box with a preset-menu would be ideal:

[Reduce image resolution: (on/off)]
[Maximum Resolution of shortest side: (12345 | v )]

• 720 (mobile-phone)
• 1080 (monitor)
• 1440
• 2160
• 4320 (8K-TV)

"12345" being a number-input, "v" opening some preset menu; not sure what kind of menu, though.
On a desktop-system i'd use a dropdown-list, but for mobile-phones a pop-up-menu seems to be better, i guess.
The preset-values i suggested here are common on many modern displays.
The input-box should open a numbers-only-keyboard on mobile devices.

Though a simple [12345 | - | + ] setting would be good enough; but it's nice to recommend some values; especially for people who just need their images to fit into an E-Mail and don't (want to) know about technical stuff.