Video Speed Controller
Speed up or slow down video playback from 0.25x slow motion to 4x fast forward in browser.
How to Use
Upload video
Select MP4, WebM, or MOV video file.
Choose speed multiplier
Select speed factor (e.g. 0.5x slow motion or 2x fast forward).
In-browser speed adjustment
Resample PTS video frame timestamps and scale audio stream tempo.
Download video
Save modified speed video clip directly to your device.
Speed Up or Slow Down Video Playback
Create engaging fast-forward time-lapses or smooth slow-motion videos. Our Video Speed Controller lets you adjust playback speed multipliers from 0.25x (slow motion) up to 4.0x (fast forward) with automatic audio pitch preservation.
Process your MP4, WebM, or MOV clips 100% privately in your browser tab without server uploads or watermarks.
Real-World Examples & Use Cases
Time-Lapse Video Creation
Speed up long design sessions, coding tutorials, drawing process videos, or construction recordings by 2x, 3x, or 4x for engaging social media posts.
Sports & Athletic Slow Motion Analysis
Slow down fast athletic movements, golf swings, dance moves, or martial arts techniques to 0.5x or 0.25x speed for detailed instruction.
Tutorial & How-To Pacing Adjustments
Speed up repetitive setup steps in software tutorials to keep viewers engaged without skipping content.
Creative Video FX & Music Videos
Apply dramatic slow-motion or rapid hyper-speed effects to music video clips and promotional reels.
How It Works
Presentation Timestamp (PTS) & Audio Tempo Scaling: Video PTS Transformation: $PTS_{new} = \text{PTS}_{old} \times \left(\frac{1}{\text{SpeedFactor}}\right)$ Audio Tempo Filter: $Tempo = \text{SpeedFactor}$. Uses Phase Vocoder time-stretching algorithm to maintain original audio pitch without "chipmunk" frequency distortion.
Frequently Asked Questions
Does changing video speed adjust audio pitch?▼
Are my videos uploaded to a server?▼
Can I speed up a video up to 4x?▼
Does this tool add watermarks?▼
What video formats work with the speed controller?▼
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