Video speed changer
Re-time a clip from half speed to double speed — the audio is time-stretched to match, without chipmunk pitch.
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A video speed changer re-times playback by a multiplier you choose, rescaling the timing of every frame and the audio track together. Push a clip to 2× and it plays in half the time; drop it to 0.5× and it stretches to twice its length. Because the audio is time-stretched rather than simply resampled, a slowed-down vocal or beat keeps its original pitch instead of sagging into a low, muddy drone, and a sped-up one doesn't turn squeaky.
Creators change playback speed when a clip has to hit a specific length or pacing. Speeding up compresses a long take into a punchy, fast-moving loop for Shorts or Reels; slowing down gives a performance, reveal, or transition room to breathe. Everything runs in your browser, so the source file never uploads — useful for unreleased tracks and rough cuts you'd rather not park on someone else's server. Keep clips short, since the full re-encode is CPU-bound and runs entirely on your own device.
How it works
- 1
Drop the video (short clips work best).
- 2
Set the speed between 0.5× and 2×.
- 3
Click apply and download.
When to use it
- Bumping a music video to about 1.1× so it slips under TikTok or Instagram Reels' duration cap without hard-cutting the ending.
- Slowing a guitar or piano cover to 0.75× for a "how it's played" breakdown that YouTube viewers can actually follow.
- Speeding a slow B-roll pan to 2× for a fast, hyperlapse-style background loop behind a lyric video.
FAQ
Does slow motion interpolate new frames?
No — frames are held longer, so 0.5× halves the effective frame rate. True optical-flow slow motion needs specialized software.
Why does this take longer than trimming?
Changing speed forces a full re-encode of every frame, unlike the trimmer's stream copy.
Can I speed up more than 2× or slow below 0.5×?
Not in a single pass — the slider is capped at 0.5×–2× because audio time-stretching gets noticeably artifact-heavy past that. To go further, download the result and run it through again; just know each pass is a fresh re-encode, so quality softens a little each time.
Does the audio stay in sync with the video?
Yes. Both streams are re-timed by the exact same factor from one timeline, so a 1.5× clip keeps lips, beats, and cuts aligned. There's no manual re-syncing or offset to fix afterward.
Can I keep the pitched-up "chipmunk" sound instead of correcting it?
No — this tool always preserves the original pitch when it re-times the audio. If you actually want the classic sped-up, higher-pitched effect, that comes from changing speed without time-stretching, which the audio speed changer handles on the audio track directly.
Related tools
Video trimmer
Trim a video to a time range instantly — stream copy means no re-encode, no quality loss. Free, no upload.
Audio speed changer
Change a track's speed from 0.5× to 2× while keeping the original pitch. Free, in your browser, no upload.
Video compressor
Compress a video to 720p/480p with H.264 CRF encoding — private, in-browser, no upload. Best for short clips.