Speed up or slow down any video — browser-based, no upload needed.
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Drop your video file here
MP4, MKV, AVI, MOV, WebM — or click to browse
Select Speed
Speed up or slow down any video file directly in your browser. No upload required.
Upload your video, choose a speed multiplier, and click Convert. FFmpeg applies setpts filter for video and atempo filter for audio.
Upload your video
Drop an MP4, MOV, MKV, or other video file onto the upload area.
Choose speed multiplier
Select a preset speed: 0.25× (slow motion), 0.5× (half speed), 2× (fast), 4× (very fast), or enter a custom value.
Audio pitch option
Choose whether to preserve the original audio pitch or let it change with the speed (chipmunk/slow motion effect).
Apply
Click "Apply Speed Change". FFmpeg re-encodes the video at the new playback rate in your browser.
Download
Save the speed-adjusted video to your device.
Tutorial Playback
Speed up recorded lecture or tutorial videos to consume hours of content in far less time.
Slow Motion Effects
Slow down action footage to create dramatic slow-motion clips for sports or creative videos.
Scientific Analysis
Play recorded experiments or motion captures at reduced speed to study details frame by frame.
Timelapse Creation
Speed up long recordings like sunsets, construction, or cooking to create timelapse-style videos.
Accessibility
Slow down fast-paced instructional videos so viewers have more time to follow along.
Music Practice
Slow down a music performance video to learn complex passages at a manageable pace.
100% Private
FFmpeg WebAssembly processes the entire video in your browser without uploading it to any server.
9 Speed Presets
Choose from 0.25x through 4x speed so you can find exactly the right playback rate for your needs.
Audio Stays in Sync
The atempo audio filter adjusts audio pitch and tempo so the sound stays natural at the new speed.
MP4 Output
The result is always an H.264-encoded MP4 for maximum compatibility across devices and platforms.
Supports All Formats
Input can be MP4, MKV, AVI, MOV, or WebM — any common video format is accepted.
Free — No Watermark
No watermark added to output. Use free for standard file sizes — sign up free to raise your limit to 80 MB, or upgrade to Pro for 250 MB.
Also Known As
AVI to MKV
Convert AVI videos to MKV format
AVI to MOV
Convert AVI videos to MOV format
AVI to MP3
Extract audio from AVI and save as MP3
AVI to MP4
Convert AVI videos to MP4 format
Compress Video
Compress video file size without losing quality
Extract Audio from Video
Extract high-quality audio from any video file
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All processing happens directly in your browser. Your documents are never sent to any server — complete privacy guaranteed for users in the USA, Canada, UK, and worldwide.
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Whether you are on a Mac, Windows PC, iPhone, or Android in New York, Toronto, London, or Sydney — our tools work instantly in any modern browser.
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