How to speed up or slow down a video
- Select your video clips from your camera roll or desktop projects folder.
- Pick your speed preset, ranging from 0.25× slow motion to 4× fast-forward.
- Decide whether to preserve natural audio pitch or mute the soundtrack completely.
- Export your re-timed MP4 clips and grab them individually or in a unified ZIP.
Fast-paced social cuts and time-lapse acceleration
Speeding up mundane setup work, crafting process montages, or condensing walk-through videos gives social content energetic momentum. Setting your video to 2× or 4× accelerates tedious screen recording tasks or long b-roll walking shots into dynamic, watchable social clips.
A two-minute screen capture running at 2× shrinks into a compact 60-second video, ready for immediate platform sharing. Output files are automatically saved with clear identifier tags like clip-2x.mp4, keeping your production assets cleanly sorted in your downloads folder.
Dialing in slow-motion sports and stunt footage
Slowing down dramatic action highlights, skateboarding tricks, or dance choreography lets viewers appreciate subtle physical details. Choosing 0.5× or 0.25× expands a brief five-second sports highlight into an elongated sequence revealing critical moments of movement.
Because the tool duplicates frames when slowing down footage, applying 0.5× to normal 30 fps clips produces visible frame stepping. For silky-smooth slow-motion playback, feed the tool footage captured in high-frame-rate modes such as 120 fps or 240 fps from your phone camera roll.
Acoustic pitch locking and background audio removal
Accelerating creator voiceovers usually causes the dreaded chipmunk effect, while slowing them down creates robotic droning. The Keep sound (same pitch) setting shifts playback tempo while locking audio pitch, letting you create crisp, natural-sounding 1.25× and 1.5× tutorial voice tracks.
When creating pure visual time-lapses where original environmental noise is jarring, select Remove sound to output an audio-free MP4. The rendering engine encodes H.264 video locally via ffmpeg on a single thread, keeping your unreleased video edits securely on your device.
Questions
Why does my 0.5× slow motion clip look choppy?
Slowing down a standard 30 fps video duplicates frames rather than generating new ones; capturing source footage at 120 fps or 240 fps delivers genuine smooth slow motion.
Can I mute the original audio when making a time-lapse?
Yes. Choose Remove sound before rendering to generate a completely muted MP4, perfect for dropping underneath background music in your editing software.
Does changing video speed re-encode the footage?
Yes. The video track is re-encoded with H.264 compression to adjust frame delivery timing, while AAC audio is synthesized or pitch-corrected to match.
Can I process multiple clips at different speeds simultaneously?
The queue applies your selected speed multiplier to all loaded clips in the batch, downloading them individually or bundled together in a ZIP file.