Video Speed Controller - Online Slow Motion & Timelapse

A Video Speed Controller allows you to change the playback speed of any video in real-time. You can create slow-motion effects (as low as 0.25x) to analyze details frame by frame, or timelapse effects (up to 4x) to quickly skim through long content. This tool works entirely in your browser — no upload to any server is required, ensuring your privacy.

Slow Motion (0.25x – 0.99x): The video plays slower than normal, stretching the duration. Ideal for sports analysis, tutorial review, or catching fast details.
Timelapse (1.01x – 4x): The video plays faster, compressing time. Great for skipping through long recordings, presentations, or surveillance footage. Simply adjust the slider or click a preset button to switch speeds instantly.

Yes! Click the "Start Recording Export" button, and the tool will re-encode the video at your chosen speed using the MediaRecorder API. The exported file is in WebM format (or MP4 on Safari). Note that exporting at very slow speeds (e.g., 0.25x) will take longer because the video must play through its entire duration during recording. For remote URLs, CORS restrictions may prevent export — we recommend uploading local files for the best experience.

This tool supports all video formats that your browser can natively play, including MP4 (H.264), WebM (VP8/VP9), MOV (Safari), OGG (Theora), and AVI (limited browser support). For best cross-browser compatibility, we recommend MP4 files with H.264 encoding. Maximum recommended file size is 500MB for smooth performance.

The A-B Loop feature lets you continuously replay a specific segment of the video. Click the "A" button to mark the loop start point, and the "B" button to mark the end point. Then toggle the loop button (🔄) to enable looping. The video will automatically jump back to point A when it reaches point B. This is perfect for analyzing sports techniques, dance moves, or any repetitive action in slow motion.

Absolutely! The interface is fully responsive and optimized for touch screens. On mobile, buttons are larger for easy tapping, and the layout adjusts to fit smaller screens. You can upload videos from your phone's gallery, adjust speed with the slider, and use all features including A-B loop and export. Keyboard shortcuts are available on desktop only.

Yes, when using browsers that support video.captureStream() (Chrome, Edge, Firefox), the exported video will include the original audio track adjusted to the new speed. Safari may export without audio in some versions. The pitch of the audio will change with the speed — slower speeds lower the pitch, faster speeds raise it, similar to analog tape speed changes.

No. All processing happens 100% locally in your browser. Your video never leaves your device. The tool uses the browser's built-in video playback engine, Canvas API, and MediaRecorder API to process everything client-side. This ensures complete privacy and eliminates upload wait times.

Frame-by-frame stepping (using the F and D keys or the step buttons) advances the video by approximately 1/30th of a second per press. Combined with slow motion, this allows you to analyze individual frames — invaluable for sports coaching, scientific observation, animation review, and quality inspection of video content.

The main limitations are: (1) Export quality depends on the browser's MediaRecorder implementation, typically using lossy compression; (2) Very large files (>1GB) may cause memory pressure; (3) Some video codecs may not be supported by your specific browser; (4) Safari has limited MediaRecorder support (MP4 only, no audio in some cases); (5) Remote URLs may face CORS restrictions preventing export. For professional-grade results, dedicated video editing software is recommended.