Change Video Speed

Speed up or slow down video files (create slow-motion or fast-forward).

Click to select a video

Supports MP4, WEBM, MOV, AVI

What is Change Video Speed?

This change video speed online tool lets you speed up or slow down any video clip, perfect for creating a slow motion video maker effect from regular footage or using fast forward to condense a long recording into a quick highlight. It's useful for sports clips, timelapses, comedic effects, or simply shortening a tutorial video. All speed adjustments process instantly in your browser.

How It Works

This tool runs FFmpeg compiled to WebAssembly directly in your browser tab to adjust your video's playback rate using FFmpeg's setpts and atempo filters, which stretch or compress the video frames and audio pitch-correctly to match your chosen speed multiplier. This means speeding up or slowing down footage correctly adjusts both the video timing and the audio pitch together.

Is It Safe to Use?

Your video is processed entirely within your browser tab using WebAssembly FFmpeg, so it's never uploaded to a server. This keeps personal clips and footage private while you create slow motion or fast-forward versions.

How to Use Change Video Speed (Step-by-Step Guide)

Upload the video clip you want to adjust
Choose a speed multiplier (e.g. 0.5x for slow motion, 2x for fast forward)
Preview the speed-adjusted clip
Click process to render the final video
Download the speed-changed video file

Frequently Asked Questions

Does this tool work as a slow motion video maker without special recording equipment?

Yes, you can take any regular-speed video and slow it down after the fact, though true high frame rate slow-motion footage recorded on a phone will look smoother than simply slowing standard footage.

Will the audio stay in sync when I change video speed online?

Yes, the tool adjusts both video timing and audio playback together, keeping them in sync while also correcting audio pitch so it doesn't sound chipmunk-like or overly deep.

What speed range can I choose for fast forward video editor effects?

You can typically choose a range from significantly slower (like 0.25x) to much faster (like 4x or more), depending on the creative effect you want.

Is there a file size limit for speeding up video online free?

Videos up to a few gigabytes typically process without issue, since everything runs using your device's own memory and processing power.

Does changing speed affect video quality?

No, resolution and visual quality remain the same; only the playback timing of frames and audio changes.

Can I use this tool to create both slow motion and fast forward versions of the same clip?

Yes, you can process the same uploaded video multiple times with different speed settings to create several versions.

Does this tool work on mobile phones?

Yes, it works in mobile browsers on Android and iOS, though processing time depends on your device's hardware.

Is this change video speed tool free with no watermark?

Yes, it's completely free and the processed video has no watermark added.

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