Free browser tool
Free Online Video Speed Changer
Speed up or slow down any video from 0.25× to 16×. Pick a preset or use the slider, preview the result, and download an MP4. No sign-up, no upload, no watermark. Start at 2× with Speed Up Video, or at half speed with Slow Down Video.
- No upload
- No sign-up
- No watermark
- MP4 output
Drop a video here or click to browse
MP4, MOV, WebM, AVI — processed locally in your browser
Sponsored by the makers
Tired of boring screen recordings?
Try Screen Charm.
Auto-zoom, captions, motion blur, camera overlay and a vertical layout for Shorts. Record once, export a polished video.
Screen Charm is a native macOS app.
How to change video speed online
Upload your video
Drop any MP4, MOV, WebM, or AVI into the tool. Processing happens locally — your file never leaves your device.
Choose a speed and preview it
Tap a preset (0.25×, 0.5×, 1.5×, 2×, 4×…) or drag the slider anywhere between 0.25× and 16×. Press play — the preview already runs at that speed, so you can judge it before exporting.
Decide what happens to the audio
Keep the natural pitch (best for narration), let the pitch shift for a chipmunk or slow-mo effect, or mute it for a time-lapse. Then click 'Change speed' and FFmpeg renders the MP4.
Download MP4
Save the resulting file. It's optimised for web playback and works in any player.
When to use a video speed changer
Speed up tutorials and demos
Remove dead time from screen recordings, walkthroughs, and software demos. A 2× export keeps the value while halving the watch time.
Create slow-motion highlights
Slow down any clip to 0.25× or 0.5× to emphasise a key moment, a product interaction, or a reaction.
Match a video to a soundtrack
Adjust a clip's length to fit a music track or slide timing without cutting frames — just change the speed slightly.
Speed-run footage for social media
Compress long recordings into short, fast-paced videos for YouTube Shorts, Instagram Reels, or TikTok.
Frequently Asked Questions
How do I speed up a video online for free?
Upload your video, choose a speed preset or drag the custom slider, and click 'Change speed'. The tool processes it locally using FFmpeg in your browser and exports an MP4 file. No account or upload needed.
What speed values are supported?
Any speed from 0.25× (slow-motion) to 16× (sixteen times faster). Quick-pick presets for the most common speeds are available, plus a continuous slider for precise control.
Does changing speed affect the audio?
Yes — both video and audio are adjusted together. FFmpeg's atempo filter keeps speech natural and clear across the full speed range.
What formats are supported?
MP4, MOV, WebM, and AVI as input. Output is always MP4, ready for sharing, editing, or uploading.
Is my video uploaded to a server?
No. Everything runs locally in your browser using FFmpeg compiled to WebAssembly. Your video never leaves your device.
Related guides
More Free Tools
Sponsored by the makers
Tired of boring screen recordings?
Try Screen Charm.
Auto-zoom, captions, motion blur, camera overlay and a vertical layout for Shorts. Record once, export a polished video.
Screen Charm is a native macOS app.