Choose the source
Open one compatible video or audio file and select Speed Control from the available tools. To process another file, use Replace from Photos or Replace from Files without leaving the tool or returning Home.
Speed Control · Free Basics + Pro Curves
Change speed, shape a video curve, or add audio pauses.
Use free Overall or Local speed control for video and audio, shape a video's timing with a preset or custom Pro curve, or add multiple silent pauses to an audio-only source.
Basic speed tutorial
How to Speed Up Video or Audio on iPhone | Basic Tutorial 2026
Watch the basic Overall and Local workflow without leaving this feature guide. Curve editing is covered in the guide below. The YouTube player loads only after you choose Play.
Free speed control, Pro curves, and audio pauses
How to change video or audio timing on iPhone.
Slow a moment down, accelerate a long process, bend a video's timing through control points, or insert silence where narration needs more room.
Choose the timing mode
Overall changes the complete source and Local marks one exact range; both are free for video or audio. Video also offers Pro Curve mode, while Pause appears only for audio sources.
Set and review the timing
Set any Overall or Local speed from 0.1× to 8× in 0.05× increments, choose and edit a video curve, or set each audio pause from 0.1 to 10 seconds. Review the expected duration before creating the result.
Fine-grained speed control and multiple audio pauses
ClipFlow lets you adjust Overall or Local playback from 0.1× through 8× in 0.05× increments, including 1×. A Local edit keeps the footage before and after the selected range at 1×.
Shape video timing with a curve
Curve mode lets ClipFlow Pro users bend a video's timing with editable control points. Start with Ramp Up, Ramp Down, Slow Middle, Fast Middle, or Rhythm Wave, then move, add, or remove internal points to create a custom curve. Presets start Smooth, and you can switch to Linear for straight speed changes between points. The source audio follows the same timing while preserving its pitch.
For an audio-only source, Pause mode inserts complete silence at every chosen position without stretching or repeating the surrounding sound. Each pause can last from 0.1 to 10 seconds. The original audio order stays intact, and the result becomes longer by the combined pause duration.
A video source produces a video result, while an audio-only source produces audio. Overall, Local, and audio Pause modes are free; video Curve mode requires ClipFlow Pro. Core processing runs on your device.