Video Speed Changer: Speed Up or Slow Down Video Free

How to change the speed of a video

Speed up a video up to 16× for a time-lapse or slow it down to 0.1× for slow motion, with natural-sounding voices thanks to pitch-preserving time-stretch. Reverse the clip, change only part of it, and choose the frame rate and resolution. Exports render faster than real time and download as MP4 or WebM, all in your browser.

Load a video, pick a preset (0.25×, 0.5×, 1.5×, 2×, 4×, 8×…) or drag the slider to any value between 0.1× and 16×, and the preview plays at that speed immediately. Choose how the sound should behave, then click Export. The tool decodes every frame, retimes it and encodes a new MP4, so the result is smooth, has the correct duration and plays in any player. A 1-minute clip at 2× becomes 30 seconds; at 0.5× it becomes 2 minutes.

Features

Any speed from 0.1× (slow motion) to 16× (time-lapse)
Natural voice: pitch-preserving audio time-stretch
Optional pitch shift (chipmunk / deep voice) or no sound
Reverse video and audio (rewind effect)
Change the speed of only part of the video
Output at 24, 30 or 60 fps and up to the original resolution
Live preview of the speed before exporting
Renders faster than real time to MP4 or WebM
No upload, no watermark, no sign-up

How to use Video Speed Changer

1
Load your video
Drop an MP4, MOV, WebM or MKV file.
2
Choose a speed
Pick a preset or any value from 0.1× to 16× and preview it.
3
Set the sound
Natural voice (keep pitch), Pitch shift, or No sound. Optionally reverse the clip.
4
Fine-tune
Limit the change to part of the video and pick the frame rate and resolution.
5
Export
Click Export and download the new MP4 when it finishes (faster than real time).

Common use cases

Speed up long tutorials, lectures and screen recordings
Create slow-motion sports, dance and trick clips
Turn hours of footage into a time-lapse
Make reverse / rewind effects for social media
Fit a clip into a platform time limit
Review footage frame by frame in slow motion

Detailed guide

Keep voices natural when speeding up

Speeding up audio the simple way raises the pitch and makes people sound like chipmunks. Natural voice mode uses a WSOLA time-stretch algorithm that changes the tempo while keeping the original pitch, so a lecture at 1.5× or a podcast clip at 2× still sounds like the same person. Pitch shift mode does the opposite on purpose for comedy or tape-style effects, and No sound gives silent time-lapses.

Slow motion that stays smooth

Slowing a 30 fps clip to 0.5× leaves only 15 new frames per second, so each frame is shown twice. For the smoothest slow motion, start from footage shot at 60, 120 or 240 fps (most phones offer a slo-mo mode) and keep the output at 30 or 60 fps. The Auto frame-rate setting matches your source, up to 60 fps.

Reverse and partial speed changes

Turn on Play in reverse to make the clip run backwards, including its sound, for rewind effects and fun social clips. Enable Only part of the video to speed up or slow down just one section, which is useful for skipping the boring middle of a recording or focusing on the key moment.

More editing tools

Want the slowed or reversed clip to repeat? Send it through the looper. Need it vertical for Reels or TikTok? Use the resizer. You can also mute the result or boost its volume.

Video Looper and boomerang maker Resize for Reels, TikTok, Shorts Mute video or change volume

Frequently asked questions

How fast or slow can I make a video?

Anywhere from 0.1× (ten times slower) to 16× (sixteen times faster), with presets for the common speeds.

Will the voice sound like a chipmunk when I speed up a video?

Not in Natural voice mode, which time-stretches the audio and keeps the original pitch. Choose Pitch shift if you want the chipmunk or deep-voice effect.

How long does exporting take?

Usually less than the length of the video. Frames are decoded and encoded directly with WebCodecs rather than recorded in real time.

Can I reverse a video?

Yes. Turn on Play in reverse; the picture and sound both play backwards. You can combine it with any speed.

Can I change the speed of only one part?

Yes. Enable Only part of the video and drag the range on the timeline; the export contains just that section at the new speed.

What file format do I get?

MP4 (H.264 + AAC) by default, which plays on every device, or WebM if you prefer.

Does slowing down reduce quality?

Resolution stays the same, but a normal 30 fps clip slowed to 0.5× repeats frames. Footage filmed at a high frame rate gives the smoothest slow motion.

Is my video uploaded?

No. Everything is processed locally in your browser.

Video Speed Changer: Speed Up or Slow Down Video Online

How to change the speed of a video

Features

How to use Video Speed Changer

Load your video

Choose a speed

Set the sound

Fine-tune

Export

Common use cases