How to use Video Speed Changer
- Select a video and choose the playback multiplier.
- Decide whether to request browser pitch preservation for its audio.
- Ensure the resulting duration fits the limit, then record with the page visible.
- Review motion, speech and measured duration in the new WebM.
Example: Video Speed Changer
Play a short clip twice as quickly.
Options
- Playback speed multiplier
- 0.5 requests half-speed playback; 2 requests double speed. The duration changes inversely and still must fit the recording cap.
- Request browser pitch preservation
- This asks the browser for pitch correction. It is not a separate pitch editor and should be judged by listening to the export.
Supported inputs and limits
Where your input is processed
This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.
A slower source can exceed the output limit
Nominal output duration is source duration divided by the multiplier. A six-second source at 0.25 would require 24 seconds and is outside the supported recording limit. Choose a shorter source or a different multiplier rather than expecting the tool to truncate it silently.
Pitch correction depends on the browser
When requested, the browser attempts to maintain pitch while changing playback pace. That does not guarantee natural speech or artifact-free music. Disabling it can change pitch with rate. This feature re-records decoded media and cannot certify frame-exact duration or preserve the original compressed stream.
Questions about Video Speed Changer
Does this guarantee corrected audio pitch?
No. Pitch behavior follows native browser playback and is not certified across browsers.
Why is the output duration only approximate?
Recording begins and ends around browser playback events, which can add small timing differences.
Can slow motion exceed the export cap?
No. The selected rate and interval must still produce an export within the 20-second limit.