🎬 Video Speed Changer
Upload your video → See it in preview → Adjust speed → Download with full audio & video. 100% free.
Click or Drag & Drop Video Here
MP4, MOV, WebM, AVI • Max 4GB • Preview shows immediately
Free Online Tools for Everyone. No Registration. No Spam. 100% Free Forever.
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Video Speed Changer – Free Online Tool to Adjust Playback Speed with Full Audio & Video Sync
Welcome to Tech Tools Free, your trusted source for 100% free, no-registration, browser-based utilities. Our Video Speed Changer is a powerful, user-friendly web application designed to help anyone—students, content creators, educators, and casual users—modify the playback speed of their videos instantly, without losing audio quality or synchronisation.
What Is the Video Speed Changer?
The Video Speed Changer is a client-side web tool that runs entirely in your browser. You can upload any compatible video file (MP4, MOV, WebM, or AVI), preview it in real time, adjust its speed from 0.25x (ultra-slow motion) to 4x (ultra-fast), and download the processed result—all for free, with no watermarks, no sign-up, and no file uploads to external servers. Your video never leaves your device, ensuring complete privacy and security.
Key Features
- ✅ Full Audio-Video Sync
Unlike basic HTML5 speed controls that only affect playback, our tool re-encodes your video at the selected speed while preserving synchronised audio—so voices remain clear and natural, even at 0.5x or 2x speed. - ✅ Instant Preview
See changes in real time! Adjust the speed dropdown, and the preview updates immediately with sound, so you know exactly how your final video will look and sound. - ✅ Wide Format Support
Upload MP4, MOV, WebM, or AVI files up to 4GB—ideal for most smartphone recordings, screen captures, and edited clips. - ✅ No Installation or Registration
Use the tool directly in your browser—no downloads, no accounts, no hidden fees. Works on Windows, Mac, Android, and iOS. - ✅ Privacy-First Processing
All processing happens locally in your browser using the MediaRecorder API. Your files are never sent to any server, making this one of the safest video tools online. - ✅ One-Click Download
Once processed, download your video as a high-quality WebM file with a single click. Filename includes your selected speed (e.g.,TechToolsFree_Video_1.5x_1729384756.webm) for easy organisation.
How It Works
- Upload: Click or drag & drop your video into the upload area.
- Preview: The video loads instantly in the player with full audio.
- Adjust Speed: Choose from 9 preset speeds (0.25x to 4x) using the dropdown.
- Process: Click “Process Video with Audio” to generate a new file at your chosen speed.
- Download: Save the final video directly to your device.
The entire workflow is intuitive, fast, and optimised for modern browsers like Google Chrome, Microsoft Edge, and Brave (which support the required captureStream() and MediaRecorder APIs).
Ideal Use Cases
- Students: Slow down lecture videos to take notes or replay complex explanations.
- Content Creators: Speed up timelapses or slow down action clips for dramatic effect.
- Language Learners: Reduce playback speed to better understand spoken dialogue.
- Editors: Quickly test pacing before final editing in professional software.
- Parents & Teachers: Adjust kids’ educational videos to match attention spans.
Why Choose Tech Tools Free?
Unlike other online video editors that require sign-ups, limit file sizes, or add watermarks, our Video Speed Changer is:
- 100% free forever
- No ads during processing
- No data collection
- Open to everyone
- Mobile-responsive (works on phones and tablets)
We built this tool because we believe powerful utilities should be accessible, private, and simple—not locked behind paywalls or complicated interfaces.
Browser Compatibility
For best results, use Google Chrome or Microsoft Edge (latest versions). Firefox has limited support for video capture, and Safari may not process audio correctly. The tool will show a clear error message if your browser isn’t supported.
File Size & Format Guidelines
- Supported formats: MP4, MOV, WebM, AVI
- Max file size: 4GB (sufficient for ~2–4 hours of 1080p video)
- Output format: WebM (VP9/VP8 + Opus audio) — widely compatible and high quality
- Processing time: Varies by video length and speed (e.g., a 1-minute video at 0.5x takes ~2 minutes to process)
Privacy & Security Promise
Your video is processed entirely in your browser. We do not:
- Upload your files to our servers
- Store or log your data
- Track your activity
- Inject ads or malware
Once you close the tab, all temporary data is automatically cleared.
Need Help or Found a Bug?
We’re committed to continuous improvement. If the tool doesn’t work as expected, click the “Report a Problem With This Tool” button to contact our team directly via our Contact Us page. Your feedback helps us make Tech Tools Free better for everyone.
Try the Video Speed Changer today—the fastest, safest, and simplest way to control your video’s pace, without compromising audio or privacy. Part of the Tech Tools Free suite of online utilities, proudly serving users worldwide since 2025. No registration. No spam. 100% free forever.
