Change Video Speed on Mac, Windows & PC — Free Speed Up / Slow Down Tool

Speed Up or Slow Down Video — Desktop Options Compared

Changing video speed is one of the most common quick edits. Speeding up a tutorial, creating a time-lapse effect, or slowing down a sports clip to catch details. Most desktop tools make this harder than it needs to be.

Method	Platform	Speed Range	Steps Required	Cost
iMovie	Mac only	0.125x – 20x	5+ clicks (project → clip → inspector → speed)	Free
Photos app	Windows	~Limited	No speed controls in basic editor	Free
Premiere Pro	Mac/Win	Any	Timeline → right-click → speed/duration	$22.99/mo
DaVinci Resolve	Mac/Win/Linux	Any	Inspector → speed change or retime controls	Free (limited)
VLC (playback only)	Any	0.25x – 4x	Changes playback only — does not export	Free
Browser tool	Any	0.25x – 4x	3 clicks: drop → select speed → download	Free

VLC can play videos at different speeds but cannot export at the new speed. iMovie works but requires creating a project, importing, adjusting, then exporting. The browser tool skips all that.

How to Change Video Speed in Your Browser

1. Open Video Speed Changer in any browser — Mac, Windows, or Linux
2. Drop your video file — MP4, MOV, AVI, WebM supported
3. Select speed — drag the slider or click a preset (0.5x, 1.5x, 2x, etc.)
4. Preview — hear and see the result before committing
5. Download — export as MP4 at the new speed

Processing happens locally. Your video stays on your machine.

Speed Settings — What to Use When

Speed	Best For	Audio Effect	File Size Change
0.25x (quarter speed)	Sports replays, dance moves, detail inspection	Very deep/slow — usually mute	4x larger
0.5x (half speed)	Tutorials you need to study, action footage	Deeper voice, still understandable	2x larger
0.75x	Slightly slowed for clarity, presentations	Slightly deeper, fully clear	~1.3x larger
1.5x	Speeding up long meetings, lectures	Slightly higher, still clear	~33% smaller
2x (double speed)	Time-lapse effect, watching lectures faster	Noticeably higher, words still recognizable	~50% smaller
3x-4x	Construction time-lapses, long processes	Chipmunk — remove audio recommended	66-75% smaller

Mac Tips

• QuickTime Player can play at 2x speed (hold Option + click fast-forward) but cannot export at the new speed. The browser tool exports the changed speed
• MOV files: Work directly in the tool. No need to convert first
• Screen recordings: macOS screen recordings (saved as MOV) can be sped up directly — great for tutorials and demos

Windows Tips

• Windows Photos app does not have speed controls in the basic video editor. The browser tool fills this gap
• Game clips (Xbox Game Bar): Saved as MP4 — drop directly into the tool to create time-lapse highlight reels
• OBS recordings: Long OBS recordings can be sped up to create condensed versions for sharing

File Size Impact of Speed Changes

Speed changes affect duration, which directly affects file size:

• Speed up = smaller file. A 10-minute video at 2x becomes 5 minutes — roughly half the file size
• Slow down = larger file. A 1-minute video at 0.5x becomes 2 minutes — roughly double the file size
• If the sped-up file is still too large, run it through Compress Video afterward