VidSpeed

Slow motion video maker

Turn a jump, a splash or a goal into a slow-motion moment. Frame blending is on by default, and the calculator below shows how slow your footage can go before it starts to stutter.

  • Runs in your browser: no upload
  • Free, no watermark, no sign-up
  • Exports MP4 (H.264 + AAC)

Drop or choose a video

MP4, MOV, WebM, MKV. It stays on this device.

0.5×slower
Audio
More options

Shot frame rate vs playback frame rate

Recorded at

Played back at

0.25×

is the slowest speed with no repeated or invented frames. One real second becomes 4 seconds on screen.

Most phones offer 120 or 240 fps "Slo-mo" modes; standard video is 24–30 fps, and 60 fps is common for sport and games. Going slower than the clean limit still works in VidSpeed, but those extra frames are duplicates or blends, which is why 0.25× from 30 fps footage looks steppy.

How to make a slow motion video

  1. Start with the right footage. If you can, record in your phone’s Slo-mo or 60 fps mode. The calculator above shows how far each frame rate can be slowed cleanly.
  2. Trim to the moment. Slow motion works best on a few seconds. Set Start and End under More options.
  3. Pick the speed. 0.5× for 60 fps footage; 0.25× for 120 fps footage played back at 30 fps.
  4. Choose the sound. Tape style gives the deep, drawn-out sound people associate with slow motion; keep-pitch keeps speech recognisable.
  5. Export and download the MP4.

Real slow motion vs slowed-down video

Film-makers call it “overcranking”: record more frames per second than you play back. A camera shooting 120 fps for a 30 fps timeline captures four real pictures for every one shown, so playing them all stretches one second into four with no repeated frames. Slowing down ordinary 30 fps footage can only repeat or blend the pictures it has. VidSpeed does the second kind of processing very well, but it cannot add detail the camera never recorded, and it does not use AI frame interpolation.

Tips for better slow motion

  • Light matters: high frame rates mean short exposures, so indoor Slo-mo often looks dark and noisy. Shoot outdoors or near a window.
  • Hold the camera still or use a support; shake gets more obvious when slowed down.
  • Pick moments with clear motion: water, hair, dust, a ball in flight.
  • Tape style audio at 0.5× drops everything one octave, which gives that heavy cinematic feel.

For gentle slow-downs of talks or tutorials, the slow down video page is set up for that. To change frame rate without changing speed, use the FPS converter.

Questions people ask

How do I make a video slow motion?

Open it in the tool above, choose a slow speed (0.5× or 0.25× are the usual picks), keep “Blend frames” on for smoother motion, press “Change speed” and download the MP4. For the smoothest result, start with a clip recorded at 120 or 240 fps.

Can I turn a normal 30 fps video into smooth slow motion?

Only up to a point. A 30 fps clip has no extra frames, so at 0.5× each picture fills twice the time. Frame blending hides that fairly well at 0.5×; at 0.25× motion will look soft or steppy. Tools that invent in-between frames need motion estimation, which is far too slow to run in a browser tab.

My iPhone Slo-mo video plays at normal speed after I share it. Why?

iPhone Slo-mo clips are recorded at 120 or 240 fps, and the slow section is usually playback information stored alongside the video rather than baked into it. Apps that ignore that information play the clip at normal speed. Opening the file here and exporting at 0.25× bakes the slow motion in: a 120 fps clip then plays at a clean 30 fps.

Does slow motion keep the sound?

Yes. You can keep the pitch (voices stay normal but slow), use tape style for the deep, dramatic slowed sound, or remove audio and add music later.