Free browser tool
Free Video Speed Changer
From 0.5x to 2x with synchronized audio when available.
Speed filters re-encode the whole file. Short clips and ≤1280 width work best.
Drop a video here
MP4 / MOV / WebM — runs on your device
100% client-side via ffmpeg.wasm. Your video never leaves this device.
About video speed
Adjust playback rate between 0.5x and 2x. Video uses setpts; audio uses atempo (chained if needed).
Disabling audio reduces memory pressure for heavy sources.
Build larger pipelines with okayok.ai.
Why change speed here
0.5x–2x range
Slider control with fine steps.
Audio sync
atempo keeps speech intelligible within range.
Private
No upload — local WASM encode.
Pairs with trim
Trim first to shorten encode time.
How to change speed
- 1
Upload
Drop a video.
- 2
Set speed
Drag the slider between 0.5 and 2.
- 3
Download
Save the re-timed MP4.
FAQ
More video tools
Video to GIF
Turn a short clip into a GIF with fps/scale limits.
Reverse Video
Reverse playback (video; audio optional, memory-heavy).
Rotate Video
Rotate 90°, 180°, or 270° in the browser.
Video Scene Cuts
Detect shot changes with ffmpeg.wasm and export keyframes or clips.
MP4 to MP3
Extract MP3 audio from video with ffmpeg.wasm in your browser.
Compress Video
Shrink video toward a target file size with bitrate or CRF.
More from Okay OK
Okay OK is the official home of the OK product family — OK Tools, OK Video, OK Images, and more.
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