How to Slow Down a Video for YouTube
The reliable way to slow down a video for YouTube is to record more frames than you intend to show. Slow motion is a capture decision; slowing a normally-shot clip afterwards spreads existing frames across more time, and that's where the judder comes from.
Slow down a video for YouTube with the Shorts camera
Speed in the Shorts creation tools is described as speeding up or slowing down recording — it's applied at capture, not to a clip you finished last week. Timer is its natural partner: it sets a countdown so you can put the phone down, get into frame, and start the shot without reaching for the screen.
For footage you've already got, the change has to happen in an editor before upload. Studio's Editor covers Trim & cut, Blur, Audio and end screens, and doesn't touch playback speed.
Frame rate is the whole story
YouTube's recommended upload settings are unusually direct about this: content should be encoded and uploaded in the same frame rate it was recorded, with 24, 25, 30, 48, 50 and 60 frames per second listed as common rates.
Read that alongside how slow motion works and the technique follows. Record at a high rate, slow the section you want during the edit so it lands at a normal delivery rate, then upload at that rate. What you must not do is record at 30, slow it to a quarter speed, and hope the encoder fills in the gaps. It can't, and the result reads as stuttering rather than as slow.
Captions that stay readable when the pace changes
Montaj doesn't have a speed control, so it won't slow a clip down. That part happens before it.
Where it helps is what a pacing change usually breaks: caption timing. Montaj transcribes the audio on your device and generates karaoke captions where each word carries its own timing, editable inline, so correcting a word or a name doesn't mean re-syncing the block around it. Text that's timed per word rather than per subtitle line survives an edit far better than text pinned to a fixed interval. Worth having in place before you slow down a video for YouTube and change every timing in it.
How to make a YouTube video slow motion in 4 steps
- 1
Capture more frames than you plan to show
Smooth slow motion comes from a high capture frame rate, not from an editor. Slowing a clip shot at a normal rate spreads the frames you already have, which is what produces the judder.
- 2
Set Speed before the take
In the Shorts camera, Speed is described as speeding up or slowing down recording, so it's a capture setting. Timer pairs with it. A countdown lets you get into position and record hands-free.
- 3
Upload at the frame rate you recorded
YouTube's recommended settings say content should be encoded and uploaded in the same frame rate it was recorded, listing 24, 25, 30, 48, 50 and 60 frames per second as common rates.
- 4
Judge the motion at full size before publishing
Judder that's invisible on a phone preview is obvious on a large screen. Watch the slowed section at full size before you commit to it.
The verdict
— Thomas, Social Media Manager