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About Change Video Speed
Change Video Speed — free, private, browser-based video tool
Speed up or slow down a video — audio stays in tune. It takes video and gives you MP4. It runs in your browser, so the file is processed on your own device.
Why use Change Video Speed
- ·Files stay on your device — nothing is uploaded
- ·No signup needed
- ·Works in any modern browser, on any OS
- ·Free daily use; Pro removes limits and watermarks
How to use it
- 1Drop a video file on the page, or click to choose one.
- 2Pick the options you want.
- 3Download the MP4 file.
What Change Video Speed does
Speed up or slow down a video — audio stays in tune. The result is a MP4 file you download directly.
How it works
Hybrid renderer: WebGL2 for color grading and effects, WebCodecs for decode/encode, ffmpeg.wasm for muxing and exotic codecs. Multi-threaded via SharedArrayBuffer where COOP/COEP is available. The processing code runs inside the page, so your file is not uploaded to a server — you can confirm this in your browser's DevTools → Network tab.
Frequently asked questions
Does Change Video Speed upload my files?+
No. Change Video Speed runs in your browser and processes the file on your device. Nothing is sent to our servers.
Is Change Video Speed free?+
Yes, with a daily free allowance and no signup. Xonvert Pro ($4.99/month) removes the daily limits and the watermark on exported files.
Do I need to install anything?+
No. It works in any modern browser on Windows, macOS, Linux, ChromeOS, Android and iPad.
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