How fast or slow can I go?

From 0.25× (quarter speed) to 4× (four times faster). Custom values are supported.

Does it keep the audio?

Your choice. You can keep audio (pitch will change with speed) or strip it.

Yes, unlimited and without watermarks.

Quality is preserved during re-encoding. For most content, no visible quality loss.

No. Processing runs in your browser via WebAssembly.

Input: MP4, MOV, AVI, MKV, WebM, FLV, WMV. Output: MP4.

Speed up or slow down any video. Pick from 0.25× to 4× playback speed. Processing happens in your browser, your video stays private.

1
Select a video
Drag and drop or browse. Supports MP4, MOV, AVI, MKV, WebM up to 2 GB.
2
Pick the speed
Choose from presets (0.25×, 0.5×, 2×, 4×) or enter a custom multiplier.
3
Download
Browser re-encodes the file and provides a direct download — no upload step.

Wide speed range
From 0.25× slow motion to 4× time lapse, and any custom value in between.
Nothing uploaded
Your video is processed entirely in your browser, never sent to a server.
Audio handling
Choose to keep audio (pitch-shifted) or drop it entirely when changing speed.
Free and unlimited
No sign-up, no watermarks, use as often as you want.

Slow-motion sports
Review a goal or a great play frame by frame by slowing clips to 0.25×.
Cooking time lapse
Speed up a 30-minute recipe video to a watchable 3-minute time lapse.
Funny speed-ups
Create the classic "sped-up voiceover" effect for social media posts.

4.8 / 5 based on 1,200+ users

How fast or slow can I go?: From 0.25× (quarter speed) to 4× (four times faster). Custom values are supported.
Does it keep the audio?: Your choice. You can keep audio (pitch will change with speed) or strip it.
Is this service free?: Yes, unlimited and without watermarks.
Will quality change?: Quality is preserved during re-encoding. For most content, no visible quality loss.
Are my files uploaded?: No. Processing runs in your browser via WebAssembly.
Does it support all video formats?: Input: MP4, MOV, AVI, MKV, WebM, FLV, WMV. Output: MP4.