It was never my intention to pit GiF Resizer against any alternative app -- I was only shining a light on an easy to miss yet relevant factor... :)

@midas
One point granted: Gif Resizer is indeed packed with UPX...checked.
Second point: PhotoScape itself is packed with NSIS - Nullsoft Scriptable Install System,

further relevant discussion continued in the forum:
https://www.portablefreeware.com/forums/viewtopic.php?f=2&t=23348

@__philippe: that wondrous tiny footprint is achieved via UPX packing -- GiF Resizer unpacked is 2,014,720 Bytes. And BTW, unpacking and repacking with a current version of UPX might decrease its size further to 586KB (KiloBytes, not Kilobits;).

Staircase wit, years late, penny short... :

@Kenny2421: Seconding your observations, wildly applauding...;-)
GifResizer does a remarkable job at swiftly reducing *reasonably-sized* animated GIFs,
with a noteworthy crisp output, provided the "Good Quality" option box is ticked.

@webfork
Admittedly more powerful, yet please consider :
PhotoScape does weigh in at a hefty 23Mb vs GifResizer mere 627Kb...;-)

@abc
14Mb animated GIF indeed...! Heed Kenny2421 wise words.

14mb at 400x300 is a heck of a lot of images in one file, so yes it will seem to freeze. chances the previous user did not watch his image closely as it wass still likely converting tbe better of a few hundred frames. dont forget that an animated gif is as much a video as a video is an animated set of stills. I am happy with the speed and stability of this tool as well as the tiny memory footprint it has. My avatars are looking much better at 1080p rather than 16p or 32p and they take for the most part a few seconds as they consist of only a handful of images. I can verify the tool works.

Thanks for testing. In my tests, PhotoScape (http://www.portablefreeware.com/index.php?id=1339) resizes GIFs reliably.

I tried a hefty 14MB 400x300 file (I converted from a video file) and it seemed to freeze up after 3 minutes had passed so I killed it with task manager. Suffice to say I'm not happy with the results.