How do you change the length of a photo?

Photos User Guide

• Welcome
• Get started
• • Overview of importing
  • From iCloud Photos
  • From a camera or phone
  • From storage devices, DVDs, and more
  • From Mail, Safari, and other apps
  • Import photos from another library
  • Where are the photos I imported?
• • Browse your photos
  • View individual photos
  • Add titles, captions, and more
  • Interact with text in a photo using Live Text
  • Use Visual Look Up to learn about a photo
  • View photos others have shared with you
  • Delete photos or recover deleted ones
  • Remove duplicates
  • Hide photos from view
  • View photo bursts
  • Play video clips
  • View Live Photos
  • • View memories
    • Personalize memories
• • Show specific types of items
  • Find photos by text, content, or date
  • Find photos by keyword
  • Find photos of a person
  • Find photos by location
• • What are albums?
  • Organize photos in albums
  • Delete albums
  • Create Smart Albums
  • Group albums in folders
• • Editing basics
  • Crop and straighten photos
  • Use a filter to change a photo
  • • Adjust a photo’s light, exposure, and more
    • Retouch photos
    • Remove red-eye
    • Adjust a photo’s white balance
    • Apply curves adjustments
    • Apply levels adjustments
    • Adjust definition
    • Apply changes to specific colors
    • Reduce noise
    • Sharpen a photo
    • Change the lighting of a Portrait mode photo
    • Apply a vignette
  • Write or draw on a photo
  • Use other apps when editing in Photos
  • Change a Live Photo
  • Change a video
  • Edit a Cinematic mode video
• • • What is iCloud Shared Photo Library?
    • Create or join a Shared Library
    • View a Shared Library
    • Add photos to a Shared Library
    • Remove photos from a Shared Library
    • Add or remove Shared Library participants
  • • What are shared albums?
    • Turn on Shared Albums
    • Create a shared album
    • Add, remove, and edit photos in a shared album
    • Add or remove subscribers
    • Subscribe to shared albums
  • Use Messages and Mail to share photos
  • Use AirDrop to share photos
  • Share photos using other apps and websites
  • Export photos, videos, slideshows, and memories
  • Export a Live Photo as an animated GIF
  • Export a video frame as a photo
• • Create slideshows
  • Create projects using third-party apps
• • Order professional prints
  • Print your own photos
• • System Photo Library overview
  • Create additional libraries
  • Back up the Photos library
  • Restore from Time Machine
  • Repair the library
  • Change where photos and videos are stored
• Change Photos settings
• Keyboard shortcuts and gestures
• Copyright

Edits you make to a Live Photo apply to both the still image and the video in the Live Photo (except for changes you make with the retouch tool, red-eye tool, and markup tools—these affect only the still image). You can trim the length of the video, turn the audio on or off, change the still image (or ) you see for the Live Photo, and make the photo loop, bounce, and simulate a long exposure.

You can also apply a filter, crop and straighten, and apply adjustments to a Live Photo, and the changes apply to the entire video.

Open Photos for me

After editing a Live Photo, you can restore it to the original by clicking Revert to Original.

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