Change Video Speed, Free nothing stored

Set one pace for the entire recording

Use a faster pace to condense a drawing, recipe or assembly demonstration. Use a slower pace to inspect a swing, jump or dance movement. The Speed choices are 0.25× (4× slower), 0.5× (2× slower), 0.75×, 1.25×, 1.5×, 2× faster, 3× faster or 4× faster; the starting selection is 2× faster.

The setting applies from beginning to end. There is no timeline for varying the pace or isolating a middle section. If you only need one moment, make an excerpt with the separate Video Trimmer before bringing that shorter file here.

Plan for a silent result when the pace changes

Every offered speed produces a video without its original audio. This is useful for a visual demonstration you intend to score separately, but it is not suitable for keeping a lecture or interview audible at a different pace.

There is no preserve-pitch switch or separate sound-speed control. Keep the original recording if voices, music or ambient sound matter. To deliver a faster spoken recording, use an editor with audio time-stretching and pitch preservation instead.

Slower timing cannot fill gaps between captured frames

Slowing footage down gives each retained frame more screen time. It does not generate intermediate movement, so a low-frame-rate source can look jerky when stretched. Start with footage containing more captured frames per second when you can.

A faster result may skip frames to respect the output frame-rate ceiling. Check quick gestures and passing objects in the result. The linked 60fps Frame Interpolator serves the separate job of smoothing motion; this speed changer only retimes the frames already present.

Save the new timing into a separate video file

Running the tool creates a new encoded video with changed frame timing. The saved file carries that pace into another player; it is more than changing a playback menu while watching. Re-encoding can change visual quality, so retain the source for future edits.

The browser tries H.264 in an MP4 container first. If it cannot encode that combination, it tries VP9 or VP8 in WebM. The export may therefore use a different file type from your input. Check the result in the app where you intend to use it.

A longer slow-motion result needs more browser memory

The tool checks both source and planned output duration, together with a size estimate that grows when the clip is slowed. A recording that fits at a faster pace can exceed the processing budget at a slower one. Phones have a lower budget than computers.

These checks reduce the chance of exhausting memory, but do not guarantee every file below them will finish. Trim an unnecessary lead-in or ending before retiming a long recording. Follow the displayed limit if a run is rejected; processing time depends on the source and the device, not just the chosen multiplier.

Retime personal footage with the browser’s own codecs

The source video is read locally and the browser decodes and encodes its frames on your device. It is not uploaded for the speed change. Retiming the frames happens locally after the speed editor loads its code over the network.

A listed file extension alone does not prove that a browser can decode the video inside it. Use a current browser with the required video decoder and encoder. If a clip fails on a phone, an updated browser or a computer may support the needed codec or provide more working memory.

How do you use the video speed changer?

1. Add the recording to retime

   Choose a MP4, MOV, WebM or MKV video from your device. Start with the original clip for each new attempt.

2. Choose the pace and run

   Set Speed, then press Change speed. Remember that the processed result will have no soundtrack.

3. Review the retimed movement

   Play the result and inspect fast gestures or choppy stretches. Read the new length and frame rate before saving.

4. Save your result

   2 free downloads, 8 more after sign-in.

When is the free video speed changer enough?

Video Speed Changer: questions and answers