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Change Video Speed

Time-lapse or slow-motion in one step. Choose a factor and export.

Browser-first · upload only when a format needs it

Time-lapse or slow-motion in one step. Choose a factor and export.

Opens MP3 · MP4 · WEBM · MOV · MKV · 3G2 · 3GP · AMV · ASF · AVI

or drop files and folders hereUp to 500 MB per file on the free plan · older formats use the server encoderFolders are welcome

How it works

  1. 01

    Choose a file for Change Video Speed. It accepts MP4, MOV, WEBM, MKV, M4V, AVI, WMV, FLV, MPEG, MPG, MPE, 3GP, 3G2, TS. Most files stay in this tab.

  2. 02

    Set the options on the workbench — preview, crop or timeline when this tool has one — then press Run.

  3. 03

    Download the result. It is also saved in your tray so the next tool can pick it up without another upload.

About this tool

Pick a speed from quarter speed to four times faster. Frames are re-timed and re-encoded; the soundtrack is resampled to match, so voices go higher when speeding up and lower when slowing down, like a tape. Mute the clip first if you would rather add music afterwards. Very slow factors on low frame-rate sources will look stepped because no frames are invented.

Questions

What can I open in Change Video Speed?
Change Video Speed accepts MP4, MOV, WEBM, MKV, M4V, AVI, WMV, FLV, MPEG, MPG, MPE, 3GP, 3G2, TS. Older video containers such as AVI, WMV, FLV, MPEG and 3GP are decoded by the server encoder.
Does Change Video Speed upload my file?
Most MP4, WebM, images and PDF stay in this tab. Instagram/TikTok crops, DVD, GIF, iPhone presets, stabilize, hard containers (AVI, WMV, HEVC) and a failed local encode go to the server encoder. The file is processed and discarded — we do not keep a copy.
How large can the file be?
Free: 500 MB and 8 exports a day. Plus (waitlist) raises the daily cap. A pasted public file URL is also accepted.

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