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Speed up or slow down any video — from 0.25x slow motion to 4x fast forward. No upload, no watermark.
Change the playback speed of any video instantly — from 0.25x ultra slow motion to 4x timelapse. No upload to any server, no watermarks. Drop your video, pick a speed, and download. Audio adjusts automatically to match. Everything runs in your browser using FFmpeg WebAssembly — your files never leave your device.
Drop your video, select a speed preset (0.25x for slow motion up to 4x for fast forward), and click Change Speed. The modified video downloads instantly as MP4. Audio speed adjusts automatically to match the video.
Yes. At 0.5x the audio plays at half speed (deeper pitch). At 2x it plays at double speed (higher pitch). FFmpeg's audio tempo filter adjusts the speed while minimizing distortion. For cinematic slow-mo without audio, consider using our Mute Video tool first.
No. Everything runs in your browser using FFmpeg WebAssembly. Your video never leaves your device — completely private and secure.
You can slow down to 0.25x (quarter speed, 4x longer) or speed up to 4x (quarter duration). For most uses, 0.5x slow-mo or 2x fast-forward produce the best balance of effect and watchability.