How to use this preset
- Choose a video.
- Set playback speed between 0.5× and 2× and preview the timing.
- Export the retimed video with synchronized audio.
LOCAL VIDEO SPEED CHANGER
Change Video Speed with Synchronized Audio
The 1.25× preset is ready. Adjust from half speed to double speed; video timing and audio tempo change together during preview and export.
✓ No upload✓ No account required✓ Start immediately after selecting a video
Drop your video hereMP4, MOV, WebM, WMV, and moreor● Nothing is uploaded
When to use this preset
- Speeding up a walkthrough.
- Slowing down a demonstration.
- Shortening a talking-head segment without muting it.
Check before you share
Changing speed changes the output duration. Extreme changes can affect perceived audio quality, so review speech before publishing.
Your source video stays on this device.Related creator tools
Creator toolsEverything stays local
Compress videoOpen dedicated tool→Compress to 25MBOpen dedicated tool→Edit your YouTube videoOpen dedicated tool→Resize for ShortsOpen dedicated tool→01Truly local processingFile APIs, WebCodecs, and WebAssembly all run in your browser.
02Every feature is freeNo file-size limit, with up to 4K, batch, and advanced tools.
03No server copyNo video upload endpoint and no account required.