Change Video Speed
Free online video speed changer. Speed up or slow down videos. Adjust playback speed from 0.25× to 4×. Create slow motion or timelapse videos. Fast and easy speed adjustment.
About Video Speed Changer
This online tool allows you to change the playback speed of video files directly in your browser. Create slow motion effects, speed up long videos, or adjust timing for presentations. Perfect for tutorials, sports analysis, or creative projects. Audio pitch is automatically preserved so voices sound natural at any speed.
What video formats are supported?
Input: MP4, WebM, MOV, AVI, MKV, and other common video formats. Output: MP4 (H.264 video + AAC audio) for universal compatibility.
What speed options are available?
Preset speeds: 0.25× (very slow), 0.5× (slow), 0.75×, 1.0× (normal), 1.25×, 1.5× (fast), 2.0× (very fast), 3.0×, 4.0× (ultra fast). You can also enter any custom speed from 0.1× to 10×.
Will the audio sound distorted?
No! The tool automatically preserves audio pitch while changing speed. Voices and music will sound natural at any speed, not like chipmunks or slow motion.
How does speed affect duration?
Speed multiplier directly affects duration. 2× speed makes video twice as fast (half duration). 0.5× speed makes video half as fast (double duration). The tool shows the new duration before processing.
What is the file size limit?
Maximum file size is 100MB. This ensures smooth processing in your browser. For larger videos, consider using desktop software.
Can I preview before downloading?
Yes! After processing, you can preview the speed-changed video to verify the result before downloading.
Is my video file safe?
Absolutely! All processing happens directly in your browser using FFmpeg.wasm (WebAssembly). Your video file is never uploaded to any server. Everything stays private on your device.
How long does processing take?
Processing time depends on video length and speed setting. Typically 30-90 seconds for a 5-minute video. Extreme speed changes (very slow or very fast) may take longer.
What are common use cases?
Slow motion: Sports analysis, dance tutorials, nature videos. Speed up: Long lectures, time-lapse effects, compress lengthy content. Creative: Music videos, artistic effects, presentation timing.