Will my video lose audio pitch when sped up?

By default, "Preserve audio pitch" is enabled, meaning voices will remain natural and not squeaky even at 1.5x or 2x speed.

Is there a limit on video length?

Because video encoding runs directly inside your browser memory, videos under 150MB work best for optimal rendering speed.

Video 100% Client-Side

Speed up or slow down videos (0.25x to 2x) with audio synchronization and smooth playback.

Zero Upload

Never leaves browser

Instant Speed

WASM accelerated

or click to browse from your device

Accelerate or slow down video playback from 0.25x up to 4.0x

Audio pitch preservation keeps human voices sounding natural at higher speeds

Instant live preview player with real-time speed adjustment

Completely in-browser processing without uploading heavy video files to remote servers

High bitrate video encoding with support for MP4 and WebM formats

Simple Workflow

Get results in three quick steps without any learning curve.

Upload an MP4, WebM, or MOV video file from your device.

Choose a preset (0.5x, 1.25x, 1.5x, 2x) or fine-tune with the speed slider.

Click "Export Video" to generate and download your speed-adjusted video.

Need Help?

Everything you need to know about this tool.

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Reduce video file size without noticeable loss in visual quality. Fast client-side video compression.

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Speed up or slow down audio recordings from 0.5x to 2.0x directly in your browser.

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