Free Online Video Speed Changer
Speed up or slow down any video from 0.25× to 4×. Audio pitch is automatically corrected so voices don’t sound chipmunk-fast or unnaturally slow. Everything runs in your browser — no uploads, no account, completely free.
Drop your video here or click to browse
MP4, WebM, MOV, AVI, MKV — speed up or slow downHow to change video speed online
Frequently asked questions
What does pitch correction do?
When you speed up a video without pitch correction, audio sounds unnaturally high-pitched (the classic "chipmunk" effect). Pitch correction uses FFmpeg’s atempo filter to speed up the audio without raising its pitch, so voices and music sound natural even at 2× speed. We recommend it for most use cases.
Is there a speed limit?
The preset buttons go up to 4×, but you can enter any custom value. Note that FFmpeg’s atempo filter only supports values between 0.5× and 2× in a single pass — for more extreme speeds the tool chains multiple atempo filters automatically. Very extreme values (above 4× or below 0.25×) may produce lower quality results.
Why does processing take longer than other tools?
Unlike trim or mute which use stream copy (no re-encoding), speed change requires re-encoding both the video and audio streams. This is more computationally intensive and takes longer, especially for longer videos. Processing time scales with video length and your device’s CPU speed.
Is my video uploaded to a server?
No — everything runs locally in your browser using WebAssembly (FFmpeg.wasm). Your video never leaves your device.
What format is the output?
Output is always MP4 (H.264 video, AAC audio). This gives the best compatibility across devices, players, and platforms.