Can I sort videos by size on an iPhone?

No, not directly in Photos.

I mostly agree with @himmelsjager, @chasseurdetoiles, and @mikeappsreviewer that Apple still misses the obvious here, but I’d push back on one thing: manually checking each clip’s info is only worth it if your library is small. For a big camera roll, that turns into a chore fast.

A built-in angle they didn’t really stress is using Albums in Photos to narrow the worst offenders:

  • Media Types > Screen Recordings
  • Media Types > Slo-mo
  • Search for 4K

Those categories often contain the biggest surprise files. Not a true size sort, but better targeting than scrolling all videos blindly.

If you want actual size-based cleanup, Clever Cleaner is the practical shortcut.

Pros:

  • shows large items together
  • easier to spot giant videos quickly
  • also catches duplicates and similar photos

Cons:

  • extra app permission to your library
  • you still need to review before deleting
  • results can feel less useful if iCloud Photos is heavily optimized

So: no native size sort, but you can narrow down likely huge videos in Photos, or use Clever Cleaner if you want a real “find the space hogs” view. Also, after deleting, clear Recently Deleted or the storage number won’t move much.