Create a Fit-to-Fill Edit in Adobe Premiere Pro

Posted on by Larry

[I re-discovered this effect while researching my webinar “Clip Speed Changes in Adobe Premiere Pro.”]

A fit-to-fill edit combines an overwrite edit with a playback speed change. It takes a marked clip in the Source montior, then changes its speed to fit a specified duration in the timeline.

The most common use for this is when editing clips to music. The musical beat often determines when edits need to occur, while the shot going into that spot may take a different amount of time to complete. A fit-to-fill edit solves that problem.

NOTE: Because a fit-to-fill edit changes the speed of a clip, it is not appropriate for any clip that has synced audio.

The process is simple: mark a clip in the Source monitor, mark a duration in the timeline where you want the clip to edit, then press the “secret key.”

Here are the details.

Drone images courtesy of Terry Holland, Northeast Drone Video (

I first added a music clip in the timeline. Now I’m editing video to illustrate it. Two initial clips are added, but I left a gap where the second clip needs to go because it hadn’t been shot when I started. Now, it’s available.

I opened the clip I want to insert in the Source monitor and marked an In and Out. Note that the duration is 3:29.

In the timeline, I also marked an In and Out where I want to insert the shot. In this example, the timeline duration is 4:25. Hmm… I don’t have enough source video to cover it.

That’s where the fit-to-fill edit comes it: It changes the speed of the source clip (faster or slower) so that it fits into the timeline In and Out.

NOTE: A fit-to-fill edit requires an In and Out marking the source clip AND an In and Out marking where it goes in the timeline.

Now – and this is the secret part – to perform the edit, press the period [ . ] key. Duh, just like every other overwrite edit.

The Fit Clip dialog window appears. Click the radio button next to Change Clip Speed, then press OK.

The source clip (Housatonic in was slowed 82.07% to fit the timeline duration.



If you trim a clip after its speed was changed, the duration of the clip changes, but not the speed. Clip speed does not adjust dynamically. However, you can change the speed of any clip using the Clip Speed / Duration window (Shortcut: Cmd + R), but that’s a technique for another tutorial.

A fit-to-fill edit is simply a special form of an overwrite edit, where the speed of the inserted clip changes to match the marked duration in the timeline.

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