Drag & drop or browse
Add one clip or many at once—drop videos here or use Choose Files.
Free Online Video Speed Changer
Speed up or slow down MP4, MOV, MKV, and WebM videos in your browser—free, no install, no upload. Drag and drop clips, choose playback speed, and download. Audio stays pitch-synced when present. Processing stays on your device for privacy.
Drag & drop videos here
or click anywhere in this area to choose files
MP4, MOV, MKV, WebM, AVI and more · Max 500 MB per file
Processed locally in your browser — files never leave your device. Need trim, crop, or other edits? Trim videos online or try the Windows desktop app.
Why Use This Free Online Video Speed Changer?
Adjust playback speed with the same privacy-first approach as our other online tools.
Flexible speed presets
From 0.25x slow-mo to 4x fast-forward—pick the pace that fits your clip.
Privacy-first
Everything runs on your device in the browser—your originals stay private.
Supported Input Formats
Change speed on popular video formats for tutorials, highlights, social clips, and more.
Video inputs
MP4, MOV, MKV, WebM, AVI, MPEG, and other common video files up to 500 MB each.
Shorter clips process faster in the browser.
Video output
Export as MP4 (H.264) or WebM—with audio pitch-synced when a track is present.
Output filename includes the speed factor (e.g. clip_2x.mp4).
How to Change Video Speed Online in 3 Steps
From original footage to faster or slower playback—in minutes.
1
Add videos
Drag and drop videos or click Choose Files. Multiple files can be queued at once.
2
Choose speed
Select playback speed and output format, then click Apply Speed.
3
Download
Save your speed-adjusted videos directly to your device when processing completes.
Video Speed Changer FAQ
Answers to common questions about changing video speed in your browser.
Is this online video speed changer free?
Yes. You can change video playback speed at no cost and without creating an account. Open the page, add your files, and click Apply Speed.
Are my files uploaded to your servers?
No. Processing runs locally in your browser. Your files are processed on your device and are not sent to Videoradius servers.
Can I speed up or slow down MP4 online?
Yes. Add an MP4 (or other supported video), choose a speed from 0.25x to 4x, and click Apply Speed. Audio stays pitch-synced when an audio track is present.
Does changing speed affect audio pitch?
No. Audio stays at the correct pitch while matching the new playback speed. Videos without audio are exported with video only.
What is the maximum file size?
Each video can be up to 500 MB. Larger or longer files may take longer depending on your device, browser, and chosen speed.
Need trim, crop, or faster batch processing?
For advanced editing, GPU acceleration, and fully offline processing, try the Videoradius Video Converter desktop app for Windows. You can also use our free Online Video Cutter or Online Video Crop tools.
Need Pro Video Editing on Windows?
Videoradius Video Converter supports speed control, 300+ formats, GPU acceleration, and 100% offline processing.