Choose a few seconds of video, pick a size and frame rate, and get a looping GIF — handy for previews, DMs and docs.
GIF is an old format with no modern compression. Shorter clips, a smaller width and a lower frame rate make much smaller files. For anything longer than a few seconds, an MP4 is usually the better choice.
No — the GIF format doesn't support audio.
No. Frames are captured and encoded on your device.