Will the audio sound weird?

No! We use pitch-correction technology. The audio will stay in the same key (pitch) but will play faster or slower. It won't sound high-pitched or deep.

Can I speed up just one part of the video?

Currently, this tool changes the speed of the entire file. To change just one section (a speed ramp), you would need to trim that section out, speed it up, and then merge it back in using our other tools.

Is there a file size limit?

No hard limits. Browser memory is the only constraint. You can process large HD videos if your computer handles it.

Does it work on iPhone videos?

Yes, we fully support MOV and HEVC files from iPhones.

Can I make it extremely fast?

Yes, our slider goes up to 4x speed. This is usually the limit before audio becomes unintelligible.

Yes, 100% free with no watermarks.

Does reducing speed increase file size?

It can! A 10-second video slowed to 0.5x becomes a 20-second video. Even though no new visual info is added, the duration doubles, which can increase file size depending on encoding settings.

Does increasing speed reduce file size?

Yes! A 10-minute video at 2x speed becomes 5 minutes. The file size will usually drop by roughly 50%.

Does it support 120fps footage?

Yes. If you upload a high-framerate file, we process it native. However, the preview player in the browser rarely supports more than 60fps, so the preview might not look as smooth as the final downloaded file.

Can I mute the video?

Yes, inside the tool settings you typically have volume controls, though for pure speed changing we assume you want to keep the audio synced.

Change Video Speed

Professional video speed controller.

Change Video Speed Online: Slow Motion & Timelapse Maker (No Watermark)

Time is one of the most powerful tools in a video editor's toolkit. Slowing down a clip adds drama, emphasizes skill, and allows the viewer to absorb complex details. Speeding up a clip (timelapse) condenses a long, boring process into a burst of satisfying energy. Whether it's a slow-motion golf swing analysis or a hyper-lapse of a painting being created, manipulating time transforms raw footage into a story.

Reelic's Video Speed Controller gives you precise mastery over playback speed directly in your browser. From ultra-slow cinematic 0.25x to hyper-fast 4x speed, our tool processes your video locally without uploading it to the cloud.

Crucially, we use FFmpeg's advanced "rubberband" audio time-stretching. This means we can change the speed without changing the pitch. You can speed up a lecture to 2x and the professor will talk faster, but they won't sound like a chipmunk. Or you can slow down a song without it sounding like a demonic growl.

Adjust video tempo and motion:

Reverse Video•

Loop Video•

Rotate & Flip

Supported Search Terms & Keywords

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Why Change Video Speed?

1. Analysis & Coaching (Slow Motion): Coaches and athletes use slow motion to break down mechanics. A tennis serve happens in 0.5 seconds. Slowing it down to 0.25x speed expands that moment to 2 seconds, revealing footwork flaws that are invisible to the naked eye.

2. Tutorials & Lectures (Speed Up): We live in a fast-paced world. Watching a 1-hour coding tutorial or lecture at 1.5x or 2x speed allows you to learn the same amount of material in half the time. It is a productivity super-hack.

3. Artistic Effect: A slow-motion shot of rain falling or a bride walking down the aisle evokes emotion. A fast-motion shot of crazy city traffic evokes stress and energy.

4. Comedy: Speeding up normal human movement (like walking) instantly makes it look like an old silent movie or a Benny Hill sketch.

The Tech: Pitch Correction Explained

In the old days (analog tape), speeding up audio physically made the vibrations faster, which raised the pitch (Chipmunk effect). Slowing it down lowered the pitch.

Reelic uses digital Time Stretching. We chop the audio into tiny milliseconds and overlap them (or space them out) to match the new video length, while keeping the actual frequency of the sound waves identical.

This means you can make a 3-minute music video last 1 minute, and the singer will still stay in key—they will just sing incredibly fast (like Eminem).

Frame Rates and Smooth Slow Motion

A common pitfall is expecting smooth slow motion from standard footage.

30fps Video: If you slow a standard 30fps video to 0.5x, it becomes effectively 15fps. It will look 'stuttery' or choppy because there aren't enough frames to fill the time.

60fps Video: If you record at 60fps (an iPhone setting), you can slow it down to 0.5x and it will play at a perfect, smooth 30fps. This is 'True Slow Motion'.

The Reelic Advantage: Even if you have choppy slow motion, our export engine ensures the file metadata is correct so it doesn't glitch out on Instagram.

Privacy & Speed

Most speed changers force you to upload your file. If you have a 1GB gameplay clip you want to speed up, uploading takes forever.

Reelic works Locally. The video is processed by your computer's CPU. The moment you click 'Export', it starts rendering. No waiting for server queues.

Step-by-Step Guide

1. Upload: Drag your video file (MP4, MKV, MOV, etc).

2. Choose Speed: Select a preset (0.5x, 2x) or use the slider for a custom speed (e.g., 1.25x).

3. Preview: Press Play. We show you a preview of the speed change instantly so you don't have to export just to check.

4. Export: Click to save the new file. We automatically adjust the audio to match.

Frequently Asked Questions

Everything you need to know about this tool.

Change Video Speed

Change Video Speed Online: Slow Motion & Timelapse Maker (No Watermark)

Supported Search Terms & Keywords

Why Change Video Speed?

The Tech: Pitch Correction Explained

Frame Rates and Smooth Slow Motion

Privacy & Speed

Step-by-Step Guide

Frequently Asked Questions

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