Adjust Video Playback Speed Online for Free Speed up or slow down videos with customizable playback speed.

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Video Speed Changer

Speed up or slow down videos with customizable playback speed.

Upload Video

Drag and drop your video file or click to browse.

Set Speed

Choose a speed multiplier (0.25x to 4x).

Apply & Download

Click Apply and download your speed-adjusted video.

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What Is Video Speed Changer?

The Video Speed Changer is a free browser-based tool that adjusts video playback speed. Speed up videos for time-lapse effects, slow them down for dramatic slow motion, or find any speed in between. Choose from preset speeds (0.25x, 0.5x, 1.5x, 2x, 4x) or enter a custom multiplier. The tool previews the speed change in real-time and exports a new video at the selected speed. Audio pitch is maintained or optionally adjusted with the speed change. All processing happens locally in your browser — no files are uploaded to any server.

Why Use Video Speed Changer?

Speed options from 0.25x to 4x with custom values
Real-time preview of speed changes
Preserves audio with speed adjustment
No uploads — all processing on your device

Common Use Cases

Time-Lapse

Speed up long recordings into quick time-lapse videos.

Slow Motion

Slow down action shots to create dramatic slow-motion effects.

Tutorial Pacing

Speed up or slow down instructional videos for optimal learning pace.

Social Media

Create sped-up or slowed-down clips for engaging social media content.

Technical Guide

The Video Speed Changer modifies the HTML5 Video element's playbackRate property to play the video at the desired speed. During recording, the video plays at the adjusted rate while Canvas captures frames and MediaRecorder records the output. The actual output video duration changes: 2x speed halves the duration, 0.5x doubles it. Audio speed is handled by the browser's built-in playback rate adjustment, which changes pitch proportionally. For speed-changed audio, the Web Audio API's playbackRate on a BufferSourceNode can maintain pitch while changing speed, though this is computationally intensive. The tool records the canvas stream at the normal frame rate, resulting in a video that plays at normal speed but shows the sped-up or slowed-down content.

Tips & Best Practices

1
Speeding up long videos can dramatically reduce file size
2
Audio pitch changes with speed — 2x speed makes audio higher pitched
3
For smooth slow motion, the source video should have a high frame rate
4
Very slow speeds (0.25x) on low-fps videos may appear choppy

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Frequently Asked Questions

Q What speed range is available?

Speeds from 0.25x (quarter speed) to 4x (quadruple speed) are supported, with custom values in between.

Q Does audio change with speed?

Yes, audio pitch and speed change together. At 2x speed, audio plays faster and at a higher pitch.

Q Is the online video speed changer private?

Yes. All processing happens locally in your browser — no files are uploaded anywhere.

Q Can I speed up very long videos?

Yes. Processing time depends on the output duration, so sped-up videos process relatively quickly.

Q How do I get smooth slow motion results?

Slow motion quality depends on the source frame rate. 60fps videos produce smoother slow motion than 30fps.

About This Tool

Video Speed Changer is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.