Stillmore

Free Video Speed Changer

Choose a playback speed from 0.5× to 2×. The picture and any audio change pace together.

Files stay in this browser. Choose up to 64 MB per job.

Only edit videos you own or have permission to edit. Stillmore does not offer a YouTube video downloader.

Shorten an eyewear shoot at 1.5×

The model poses with sunglasses between takes. The five-second source becomes a shorter MP4 with the movement and soundtrack accelerated together.

Original
Edited output

How to change a clip’s playback speed

  1. Choose a source video

    Pick the action whose timing needs to change.

  2. Set a speed multiplier

    Choose a lower rate to slow the action or a higher rate to shorten it.

  3. Export and listen

    Review the motion and speech in the MP4 at normal player speed.

Find the pace that lets the viewer follow

A single speed applies to the full clip. For a mixed sequence, change the pace of the relevant shot before joining it to the rest.

Speed up a setup sequence

Move through a repeated assembly step quickly before returning to the result at normal speed.

Slow down a product detail

Give viewers time to see a latch close or a texture change in a short close-up.

Fit a silent comparison

Speed up a long take to place its before-and-after moments closer together.

Check a spoken demo

Try a modest increase first and listen for words that become difficult to follow.

Video speed changer FAQ

Why does a slowed-down movement look choppy?

Slowing a clip spreads the recorded frames over more time. Footage shot at a higher frame rate gives you more motion detail to work with. Review the fastest movement before keeping the edit.

What does 2× do to the running time?

A 20-second source plays in roughly 10 seconds at 2×. At 0.5× it takes roughly 40 seconds.

Does the audio change with the video?

Yes. When an audio track exists, its tempo changes along with the picture.

Can I speed up only the middle section?

One rate applies to the entire input. Prepare the section as its own clip if the surrounding shots should stay at normal speed.

How long does a six-second shot become at 1.5×?

About four seconds. Divide the original duration by the speed multiplier to estimate the new running time.

Can I slow down a clip that has no audio?

Yes. Choose a slower speed and export. A silent video can be retimed without adding an audio track.

Which speed should I choose to double the running time?

Choose 0.5×. A five-second source will play for about ten seconds.