Change video speed from 0.25× to 4×
Change video speed and export an MP4 with adjusted playback timing. Free to use, with no sign-up required.
Files processed on your deviceFFmpeg runs locally in your browser. First use loads a roughly 32 MB same-origin WebAssembly core and can take time and use substantial memory. Combined inputs are limited to 100 MB, media duration to 30 minutes, frame dimensions to 4,096 pixels per side and 16 megapixels total, and output to 250 MB. Codec and filter support depends on the bundled build.
01 How it works
- Choose one video file.
- Set the playback speed.
- Download the adjusted MP4.
02 Good to know
The video and audio are re-encoded as MP4. Changing speed also changes clip duration; output duration and codec support depend on the input and available encoders.
03Speed up or slow down a video
Select one video and set a speed between 0.25× and 4×. The tool re-encodes video and audio as MP4.
Speed changes also change the clip duration. The final duration depends on the source and selected speed; available codecs and encoders can affect whether processing succeeds.
04Limits and compatibility
FFmpeg runs locally in the browser. Combined input is limited to 100 MB and duration to 30 minutes, with dimensions up to 4,096 pixels per side and 16 megapixels total.
05 Questions
Does changing speed affect duration?
Yes. Faster playback shortens the clip, while slower playback lengthens it.
Can I choose any speed?
The available range is 0.25× to 4×.