Change Video Speed

Drop your video here or click to browse

Supports MP4, WebM, MKV, MOV up to 500MB

How to Change Video Speed

Upload Your Video File

Drag and drop your video into the upload area or click to browse. The tool accepts MP4, WebM, MKV, and MOV files up to 500MB.
Choose a Speed

Pick a speed preset between 0.25x and 4x. Values above 1x make the video faster; values below 1x create slow motion. The estimated output duration updates instantly.
Change the Speed

Click the Change Speed button. The tool replays the clip at the new speed onto a canvas, records it with the browser's MediaRecorder, and retimes the audio with Web Audio, so the wait is about the length of the retimed video.
Download the Result

Preview the retimed video and click Download to save it. The output has no watermark and is ready to share.

Common Use Cases

Create Slow-Motion Highlights

Slow a clip to 0.5x or 0.25x to emphasize a sports moment, a reaction, or fine detail that moves too fast at normal speed.

Speed Up Tutorials and Timelapses

Run long screen recordings or how-to videos at 2x or 4x so viewers get to the point faster and the file is shorter.

Fit a Clip to a Time Limit

Social platforms cap video length. Speed a clip up slightly so it fits the limit without cutting any content.

Match Footage to a Soundtrack

Adjust playback speed so on-screen action lines up with the beat or pacing of background music.

Why use our Video Speed Changer?

Our video speed changer lets you speed up or slow down a video with one click. The audio is retimed along with the picture, so the result stays in sync. It works with MP4, WebM, MKV, and MOV files and runs entirely in your browser: each frame is drawn onto a canvas, the browser's MediaRecorder captures it, and Web Audio retimes the sound. The recorder works in real time, so the wait is about the length of the retimed clip and the export is a WebM file. Nothing is uploaded, so private footage stays on your device. The output carries no watermark, unlike most online video editors, and there are no usage limits.

The Video Speed Changer is a browser-based tool that speeds up or slows down a video while keeping the audio in sync. Choose a preset from 0.25x for dramatic slow motion up to 4x for fast timelapses, and the tool replays the clip at that speed onto a canvas, records it with the browser's MediaRecorder, and retimes the audio with Web Audio, entirely on your device.

Unlike server-based editors that upload your file, queue it, and watermark the output, this tool processes everything locally in your browser. Your video never leaves your device, which makes it safe for private footage. There are no signups and no watermark on the result. If you want to retime only part of a clip, trim it first with the Video Trimmer. To change the frame size use the Video Resizer, to crop the frame use the Video Cropper, and to drop the audio entirely use the Mute Video tool.

This tool is ideal for creating slow-motion highlights, compressing long tutorials into quick timelapses, and fitting clips to a platform's time limit. Combined with the other FindUtils media tools, you get a complete browser-based video workflow without installing software.

How it compares

Most online speed changers require you to upload the file to a remote server, wait in a processing queue, and download a watermarked result. For large files this is slow, and for private recordings it means handing footage to a third party. Tools like Clideo, Kapwing, and Ezgif offer speed controls but cap usage and add branding.

The FindUtils Video Speed Changer runs entirely in your browser. There is no upload, no queue, and no watermark. The audio is retimed along with the video so the result stays in sync. The trade-off is that the video is re-recorded through MediaRecorder in real time, so the wait is about the length of the retimed clip and the export is a WebM file. For typical short clips that is a small price, and the privacy gain is total.

Tips for Best Results

Speeding a video up shortens it; slowing it down makes it longer. The duration readout shows the result before you export.
At high speeds the source may not have enough frames, so very fast output can look slightly choppy.
Slow-motion looks smoothest when the source was recorded at a high frame rate.
Audio pitch rises when you speed up and drops when you slow down — this is normal for a true speed change.
Trim the clip first with the Video Trimmer if you only want to retime part of it.

Frequently Asked Questions

How do I change the speed of a video online?

Upload your video, pick a speed preset between 0.25x and 4x, then click Change Speed. The retimed file downloads with no watermark and no signup.

Are my videos uploaded to a server?

No. The clip is re-recorded in your browser and the video file never leaves your device. The page loads ad and analytics scripts as most sites do, and they never see your file.

Does the audio stay in sync when I change speed?

Yes. The audio track is retimed along with the video, so speech and sound stay aligned with the picture at the new speed.

Why does the audio sound higher or lower after a speed change?

Speeding a video up raises the audio pitch and slowing it down lowers it. This is the natural result of a true speed change, the same as playing a record faster or slower.

Can I create slow-motion video?

Yes. Choose 0.5x or 0.25x to slow the video down. Slow motion looks smoothest when the original was recorded at a high frame rate.

Is there a watermark on the output?

No. The output has no watermark and no branding. It is ready to upload or share immediately.

What format is the output video?

The retimed video is saved as a WebM file, which is widely supported by browsers and social platforms. You can convert it with the Video Format Converter if you need MP4.

Is there a file size limit?

Yes. The tool accepts videos up to 500 MB and rejects anything larger before reading it. Within the cap, the recording runs in real time, so the wait is about the length of the retimed clip.