Free video speed changer
Speed up or slow down any video, from 0.25× to 4×, with audio that still sounds human. No upload, no account, no watermark.
How to change video speed
Add your video
Drop in an MP4, MOV or WebM. It's read straight off your device — nothing is uploaded to a server.
Pick a speed
Anything from 0.25× slow motion to 4× fast forward. The preview plays at the new speed so you can hear it before you commit.
Export and download
Your browser re-encodes the video and hands you the file. No watermark, no sign-up, no size limit beyond your own machine.
Voices stay natural
Playing audio faster normally raises its pitch. This stretches the audio in time instead, so a sped-up walkthrough still sounds like you — not a chipmunk.
Your video never leaves
Everything runs locally in your browser — the file is never sent to a server, so there is nothing to delete afterwards and nothing to wait in a queue for.
Record it right the first time
Speeding up a recording is a patch. Tella records screen and camera and trims the dead air for you with Auto Cut, so the video is the right length before you export it.
FAQ
Drop your video into the box above, pick a speed — 1.5× and 2× are the usual choices for a walkthrough or lecture — and click Export. Your browser produces the new file and you download it. There's no account and no upload.
Yes. Anything below 1× slows the video down, to a minimum of 0.25×. That's useful for reviewing a demo frame by frame or making a slow-motion clip out of ordinary footage.
No. Simply replaying audio faster raises its pitch, which is what makes sped-up voices sound like chipmunks. This tool stretches the audio in time and leaves the pitch where it was, so speech still sounds natural at 2×.
No. The video is decoded, re-timed and re-encoded entirely inside your browser using your device's own video encoder. The file never reaches a server, which is also why there's no queue and no file-size limit beyond your machine's memory.
Neither. The exported video has no watermark and no imposed duration cap. Very long or 4K videos take longer to encode and use more memory, since the work happens on your own device.
Most common formats work, including MP4, MOV and WebM. Export is MP4 where your browser supports it, and WebM otherwise. Some browsers can't decode HEVC video from iPhone screen recordings — Chrome is the safest choice for those.
It runs in mobile browsers that support in-browser video encoding, including recent Safari on iOS and Chrome on Android. Phones have less memory than laptops, so large files are more likely to fail there than on a desktop.
This tool applies one speed to the whole video. For speeding up a single section — or cutting the silences instead of speeding through them — record and edit in Tella, where Auto Cut removes dead air automatically.