How to use it
- Paste a link or upload the video.
- Choose Change Speed.
- Pick a speed from 0.25× to 4×.
- Press Apply.
- Download the result.
Features
Audio stays natural
We use proper time-stretching, chained for extreme speeds, so a 4× video still has intelligible speech rather than a squeak.
Built for phones
Large touch targets, a timeline you can actually drag with a thumb, and a sticky action button. Works in Safari on iPhone and Chrome on Android without an app.
Private by default
No sign-up, no tracking of what you process, and automatic deletion. Your links are never sent to analytics and your files are never made public.
How it works technically
Video timing is changed by rewriting presentation timestamps, and audio by the atempo filter. atempo only accepts 0.5× to 2.0× in one step, so anything beyond that is applied as a chain — 4× becomes two 2× stages. Slowing footage below 0.5× will look choppy unless the source has a high frame rate, because there simply are not enough frames to stretch.
Frequently asked questions
What happens to my file after processing?
It is deleted automatically. Your result is stored in a temporary folder for a short window so you can download it, then removed permanently along with any intermediate files. We do not publish, index, share or keep your media, and we never use it to train AI models.
Do I need to install any software?
No. Everything runs in your browser and on our servers, so it works the same on Windows, macOS, Linux, Android and iPhone. There is no app to install and no account to create.
Can I process any video I find online?
Only content you own or are otherwise permitted to process. The service works with publicly accessible links and does not bypass DRM, paywalls, sign-in or any other access control. You are responsible for having the rights to the material you submit.