Open the Twitter post containing the GIF
Copy the tweet link
Paste the link into a Twitter GIF downloader website or app
Download the GIF as a video file if prompted
Save the file to your device
On mobile, use the share menu and choose a download option if available
On desktop, right-click the GIF or video and select save if the option appears
If needed, use screen recording to capture the GIF
Convert the downloaded video to GIF if you need a GIF file format