Video Speed Changer
Change video playback speed online for free. Create slow motion or speed up videos. Supports 0.25x to 4x speed. No upload required.
Free video speed changer. Create slow motion (0.25x) or speed up (4x) videos. Adjust audio pitch with speed. 100% browser-based.
- ✓ Speed presets from 0.25x (very slow) to 4x (very fast)
- ✓ Custom speed value support
- ✓ Option to keep or remove audio track
- ✓ Audio pitch automatically adjusted with speed
- ✓ 100% client-side - videos never leave your device
How to Change Video Speed
- 1 Upload your video file by clicking or dragging it to the upload area
- 2 Select a speed preset or enter a custom speed value
- 3 Choose whether to keep or remove the audio track
- 4 Preview the video at your selected speed
- 5 Click 'Apply Speed Change' and download the modified video
Frequently Asked Questions
How does browser-based video processing work? ▼
MagicKit uses FFmpeg compiled to WebAssembly (WASM). This brings professional video editing capabilities directly to your browser.
What video formats are supported? ▼
MP4, WebM, MOV, and AVI. Some tools also support MKV and other formats.
Is there a file size limit for videos? ▼
We recommend files under 500MB for optimal browser performance. Larger files will work but may be slower.
Why does video processing take time? ▼
Video encoding is computationally intensive. Processing happens on your device, so speed depends on your computer's capabilities.
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Last updated: January 15, 2026 · v2.1