Video Speed Changer
Create slow motion or fast-forward effects with correct audio pitch. Pick a speed from 0.25x to 2x and both the video and audio timelines are adjusted together, so voices and music stay in sync.
How to change video speed
- 01Upload the video you want to speed up or slow down.
- 02Pick a speed preset from 0.25x to 2x.
- 03Click Apply, preview the result, and download the re-timed video.
Speed change features
Audio tempo is processed with atempo filters matched to the video speed - no drifting dialogue, no chipmunk voices beyond the effect you asked for.
Speeds outside the single-filter range (0.5-2x) are chained automatically, so 0.25x slow motion works correctly.
Videos without an audio track are re-timed video-only, no errors or silent padding.
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Frequently asked questions
Will the audio pitch change?+
The atempo filter changes speed while preserving pitch, so voices remain natural - just faster or slower.
What is the slowest speed I can pick?+
0.25x, a quarter of the original speed. It is produced by chaining two 0.5x tempo steps for correct audio.
Does changing speed re-encode the video?+
Yes, speed changes always require re-encoding; CRF 28 keeps the quality visually unchanged.