Video Speed Changer - Adjust Playback Speed Online

Change video playback speed from 0.25x to 4x in your browser. Create slow motion or time lapse effects with audio pitch control. No uploads, completely private.

Video

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Supports MP4, MOV, AVI, WebM, MKV

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Frequently Asked Questions

This tool supports speed adjustments from 0.25x (quarter speed) to 4x (quadruple speed). Slower speeds create slow motion effects perfect for analyzing sports or dance movements, while faster speeds create time lapse effects ideal for condensing long videos.

You can choose to preserve original audio pitch (voices sound natural at different speeds), adjust pitch proportionally (chipmunk effect when sped up, deep effect when slowed down), or mute audio entirely. Preserving pitch uses the atempo filter which maintains voice quality.

The tool re-encodes video using H.264 codec with high quality settings. There may be minor quality loss during encoding, but playback smoothness is maintained at all speeds. The output file size may increase or decrease depending on the speed multiplier.

Yes, speeds below 1x (such as 0.25x, 0.5x, 0.75x) create slow motion effects. This is perfect for analyzing fast movements in sports videos, creating dramatic effects in creative projects, or studying technique in instructional videos.

Use speeds above 1x (such as 1.5x, 2x, 3x, or 4x) to create time lapse effects. This condenses long videos into shorter durations, perfect for showing processes like cooking, construction, or sunsets in accelerated time.

The tool accepts most common video formats including MP4, MOV, AVI, WebM, and MKV. Output is always in MP4 format with H.264 video codec and AAC audio codec for maximum compatibility across devices and platforms.

New duration equals original duration divided by speed multiplier. A 60-second video at 2x speed becomes 30 seconds, while at 0.5x speed it becomes 120 seconds. The tool displays both original and new durations before processing.

Video processing happens entirely in your browser using WebAssembly. Large files or high resolutions require more computational power. Processing time increases with longer videos, higher resolutions, and slower speeds. Consider using smaller resolution videos for faster results.

Absolutely. All processing happens locally in your browser using FFmpeg WebAssembly. Your video files never leave your device or get uploaded to any server. This ensures complete privacy and works offline once the page is loaded.

Currently, the tool processes one video at a time for optimal performance. Processing videos sequentially prevents browser memory issues and ensures each video gets full processing resources for the best quality output.

Video Speed Changer - Adjust Playback Speed Online

Video

Drop video file here

Speed Settings

Speed-Adjusted Video

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