Online Video Speed Changer

Easily change video playback speed, from 0.25x slow motion to 4x fast forward. Perfect for time-lapse, slow motion, and more.

Local processing protects your privacy

Your video files are never uploaded to any server. Everything is processed locally in your browser to keep your privacy safe.

Multiple speed options

8 speed presets from ultra-slow 0.25x to ultra-fast 4x to cover every need

Multiple Format Support

Supports popular video formats like MP4, WebM, and MOV, with your choice of output format

Drag and drop video files here

or

Supports MP4, WebM, MOV, MKV, AVI, and more

Use Cases

  • Create time-lapse effects — speed up long recordings to showcase sunrises, sunsets, blooming flowers, and more
  • Slow-motion replay for highlight moments — slow down sports or dance footage to capture every detail
  • Speed up tutorials or demo videos to save viewers time and boost content consumption efficiency
  • Use speed changes in short-form video creation to add fun, dynamic rhythm between fast and slow sections

About the Video Speed Changer

VideoKit's Online Video Speed Changer is built on WebCodecs technology, letting you adjust video speed right in your browser. It supports 0.25x slow motion to 4x fast forward across 8 speed presets. Speed changes affect both video and audio tracks, keeping them in sync. Everything runs locally — your video files are never uploaded to a server, keeping your data private. Supports MP4, WebM, MOV, and other popular video formats for both input and output.

Frequently Asked Questions

Will changing speed affect video quality?

We use high-quality encoding parameters when changing speed, so quality loss is minimal. Speed adjustment requires re-encoding the video, but we preserve the original quality as much as possible.

What happens to the audio after changing speed?

Changing speed also affects the audio track, so pitch changes with speed. Speeding up raises the pitch; slowing down lowers it. This is the natural result of keeping audio and video in sync.

Will my video files be uploaded?

No. All video processing happens locally in your browser. Files are never uploaded to any server, and your video data stays entirely under your control.

Which video formats are supported?

Reads most common video formats (MP4, WebM, MOV, MKV, AVI, and more) and outputs in MP4, WebM, or MOV. For the best experience, we recommend a recent browser (Chrome or Edge).