Change Video Speed Online
Change video speed online to create slow motion or fast-forward clips. Choose 0.25x to 2x; video and audio are retimed together so speech and music stay in sync.
How to change video speed online
- 01Open the video speed changer and upload the clip you want to speed up or slow down.
- 02Pick a speed preset from 0.25x to 2x.
- 03Click Apply, preview the result, and download the re-timed video.
Speed change features
Audio tempo is processed with atempo filters matched to the video speed - no drifting dialogue, no chipmunk voices beyond the effect you asked for.
Speeds outside the single-filter range (0.5-2x) are chained automatically, so 0.25x slow motion works correctly.
Videos without an audio track are re-timed video-only, no errors or silent padding.
Related free tools
Frequently asked questions
How do I change video speed online?+
Open the video speed changer, upload your clip, choose a speed from 0.25x to 2x, apply the change, preview the result, and download the re-timed video.
What is the slowest speed I can pick?+
0.25x, a quarter of the original speed. It is produced by chaining two 0.5x tempo steps for correct audio.
Does changing speed re-encode the video?+
Yes, speed changes always require re-encoding; CRF 28 keeps the quality visually unchanged.
How do I speed up a video online?+
Upload your video, choose a speed such as 1.5x or 2x, apply the change, preview the result, and download the faster clip.
How do I make a video slow motion online?+
Choose 0.5x or 0.25x in the speed changer. The video is slowed down and the audio timeline is adjusted to stay synchronized.
Related articles
How to Change Video Speed Online
Learn how to change video speed online, speed up a clip, or make slow motion while keeping the audio synchronized in your browser.
How to Merge Videos Online
Learn how to merge two or more videos online, reorder clips, handle mixed formats, and export one clean MP4 in your browser.