Make a time-lapse of a long recording, slow down a moment, or play a tutorial at 1.5×. The picture is usually copied without re-encoding, and the sound keeps its natural pitch (or not, if you prefer the effect).
Change video speed at a glance
| Price | Free, no sign-up, no watermark, no daily limit |
|---|---|
| Accepts | MP4 · MOV · WebM · MKV |
| Largest file | 2 GB per file |
| Where it runs | In your browser: files are never uploaded |
| Works on | Chrome and Edge, Safari 17+, Firefox 130+ on iPhone, Android, Windows, Mac and Linux |
| Send the result | Download it, or send it free with a link or by email (up to 20 GB) |
How to change video speed
- Choose or drop a video.
- Pick a speed from 0.25× to 4×.
- Choose what happens to the sound: keep the pitch, let it follow the speed, or remove it.
- Press Change speed, watch the result, then download or send it.
How it works
The compressed frames are copied with new timestamps, so the picture is not re-encoded: a 30 fps clip at 2× becomes 60 fps, at 0.5× 15 fps. Only when the result would go above 60 fps (for example 4× of a 30 fps clip) is the video re-encoded and frames skipped to a smooth 30 or 60 fps.
Slow motion shows each frame longer; the tool does not invent in-between frames. For silky slow motion, start from a video recorded at 60, 120 or 240 fps.
The sound
- Keep the pitch: time-stretched with WSOLA, voices sound natural. Best between 0.5× and 2×; at extremes it can sound slightly echoey.
- Pitch follows the speed: like a tape played faster or slower (chipmunk or deep voice), with no stretching artefacts.
- Remove the sound: for time-lapses where the sound is just noise.
Private and free
The video is processed on your device and never uploaded, with no watermark. For audio files, use Change audio speed; to cut the part you want first, use Trim video.
How this compares
| This tool | Online converters (e.g. Clideo, FreeConvert or CloudConvert) | Desktop apps (e.g. HandBrake) | |
|---|---|---|---|
| Your file is uploaded | No | Yes, to their servers | No |
| Install or account | None | Account for some features | Install needed |
| Watermark or daily limits | None | Common on free plans | Depends on the app |
Plans of other services change; check their sites. More video tools.
Frequently asked questions
Does changing the speed reduce quality?
Usually not: up to 60 fps in the result the frames are copied unchanged. Above that the video is re-encoded at a high bitrate.
Can I speed up a video without the chipmunk voice?
Yes, that is the default: “Keep the pitch” time-stretches the sound.
How slow can I go?
Down to 0.25×, four times slower. Smooth slow motion needs a video recorded at a high frame rate.
Is my video uploaded?
No. It is processed in your browser.
Need to send a big file?
Send files up to 20 GB with a download link or by email. Free, no account needed, original quality.
Send large files free