advanced station
Change Video Speed
Change playback speed of any video. Speed it up to 8x or slow it down to 0.25x. Audio synced. Free. Formats: MP4, AVI, MOV, MKV, WEBM to MP4.
- Accepted input
- MP4, AVI, MOV, MKV, WEBM
- Result
- MP4
Active conversion station
Change Speed
Speed up or slow down video
What does Change Speed do?
Change Speed is a browser-based advanced tool that lets you speed up or slow down video. It accepts MP4, AVI, MOV, MKV, WEBM input and produces MP4. The file is checked against the displayed input rules before processing, and conversion starts only after you select Start Conversion.
How to Change Speed Online — 3 Simple Steps
Upload your file
Drag and drop or use the file picker. The tool shows its accepted input types.
Choose your settings
Select output format, quality, and any tool-specific options.
Collect the result
Click Convert and download the processed file when it is ready.
Why Use ConvertFast's Change Speed?
- Professional-grade processing algorithms
- Video stabilization via vidstab
- Leading-silence detection and end trimming
- Metadata inspection with full codec details
- Failures use the same shared, recoverable job state
Frequently Asked Questions
Can I use Change Speed without an account?
Yes. The current ConvertFast Change Speed opens without registration. The interface rejects files larger than 500 MB before a conversion request is sent.
What happens to my file when I use Change Speed?
The selected file is sent to the conversion service only after you start the operation. The browser stores job metadata only when you choose to save it to local history. Review the privacy policy before processing sensitive material.
Which formats does Change Speed support?
Change Speed accepts MP4, AVI, MOV, MKV, WEBM input and produces MP4. The available settings are shown in the converter before processing starts.
Ready? It's Free.
No account required. Input rules appear before you upload.
Open Change Speed Tool