⏩ Video Speed Changer
Changes playback rate from 0.25x to 4x with ffmpeg.wasm: video timestamps are scaled with setpts and audio is stretched with atempo, then both streams are mapped into a new file. atempo changes tempo while preserving pitch, so voices keep their register even at double speed. The page reads the whole clip in browser memory and the roughly 25 MB runtime downloads once; files stay local.
- Range0.25x to 4x
- Videosetpts, re-encoded
- Audioatempo, re-encoded
- UploadNever - local
What each speed range is actually good for
| Your situation | What setpts and atempo do | Better move |
|---|---|---|
| 0.25x to study a golf swing | Spreads the same frames over four times the duration | Use 0.25x on a short excerpt; a full match becomes very long |
| 2x for a lecture recording | Halves the duration; speech stays intelligible at 2x | Keep 1.5x or 2x for talking-head content |
| 4x time-lapse of a build | Compresses most of the temporal detail into a very short file | Start with 3x - 4x on handheld footage looks jerky |
| Dense narration must stay clear | atempo keeps the pitch, but the timing is compressed | Pick 1.5x rather than 2x when every word matters |
| Need the original file untouched | Writes a new output file rather than editing in place | Keep the source; the re-encode is lossy |
| First conversion in this browser | ffmpeg.wasm, about 25 MB, loads before any frame is processed | Try a 10 s clip first to warm the cache |
Video Speed: Change video playback speed
Video Speed lets you change video playback speed. Upload a video and get a speed-adjusted video — all processed locally in your browser, with no uploads and no sign-up.
Create slow-motion clips
Create slow-motion clips. This is one of the most common reasons people reach for Video Speed — and it handles the job in seconds, entirely in your browser.
Speed up long footage for timelapse
Speed up long footage for timelapse. This is one of the most common reasons people reach for Video Speed — and it handles the job in seconds, entirely in your browser.
Adjust speed for highlight reels
Adjust speed for highlight reels. This is one of the most common reasons people reach for Video Speed — and it handles the job in seconds, entirely in your browser.
Everything You Need in a Video Speed
Powerful features that make Video Speed fast, private, and free.
Browser-Based
Video processing happens locally — no uploads.
Common Formats
Supports MP4, WebM, and other browser-playable formats.
Trim & Convert
Cut, rotate, speed up, and convert video clips.
100% Private
Your videos never leave your device.
Free Forever
No sign-up, no watermarks, no duration limits.
Frame & GIF Export
Extract frames or create animated GIFs from video.
How to Use
Upload the video
Add the clip you want to speed up or slow down.
Pick a speed
Choose from 0.25x to 3x — slower for analysis, faster for time-lapse or reviewing long footage.
Run the conversion
The tool re-encodes the video at the chosen speed in your browser.
Download the result
Save the adjusted video for sharing or further editing.
Detailed User Guide
Speed up or slow down a video
Choose from 0.25x to 3x to create slow-motion for analysis or fast-motion to condense long footage into a short clip.
Audio pitch follows the speed
Slowing down lowers the pitch and speeding up raises it, which is the classic chipmunk effect. This is expected unless the tool preserves pitch separately.
Processed locally with FFmpeg
The conversion runs in your browser via WebAssembly FFmpeg, so your footage never uploads to a server.
Higher speeds mean smaller files
Speeding up reduces the number of frames, which can shrink the file. Slowing down may increase processing time.
Great for tutorials and reviews
Slow a recorded screen demo to see the exact clicks, or speed up a long meeting recording to review it faster.
Time-lapse from long recordings
Speeding a long static recording up to 3x or more is a quick way to create a time-lapse effect, condensing hours of footage into a watchable short clip.
Use speed changes for accessibility
Slowing a tutorial down helps viewers follow complex steps, while 1.5x is a popular default for quickly reviewing lecture recordings without losing comprehension.
Recommended Gear for Video & Podcasting
Audio and tools that speed up your video workflow.
DJI Mic Mini (2-pack)
Ultralight wireless lav mics with charging case — professional audio on the go.
FIFINE AM8 USB Microphone
USB/XLR dynamic mic — great for podcasts, streaming, and voiceovers.
UBeesize 60" Phone Tripod
Adjustable tripod with phone mount — perfect for product videos and live streams.
SanDisk Extreme SSD 1TB
Rugged portable SSD — fast backup for photos, videos, and large files.
Canon SELPHY CP1500
Wireless compact photo printer — print 4x6 photos from your phone.
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