Can I speed up a video without changing the pitch?

Yes. The sound is time-stretched, not resampled: in our 2× test a 440 Hz tone measured 439.9 Hz afterwards.

How do I make a video 2× speed?

Choose 2× and press Change speed. An 8-second clip became 4.07 seconds.

How slow can I make it?

Down to 0.25×, four times longer than the original.

Can I make a silent time-lapse?

Yes. Pick 3× or 4× and untick “Keep audio”.

Does it work on MOV and WebM?

Yes. The result is always an MP4 (H.264 + AAC).

All Free Video Tools

Change Video Speed — Speed Up or Slow Down

Speed a video up to 4× or slow it down to 0.25×. Picture and sound change together, and voices keep their normal pitch.

Speeding through a lecture or meeting? Read the transcript instead →

Choose video

Choose a video or drop it here

MP4, MOV, WebM, MKV, AVI — processed in your browser, never uploaded

Before and after: 2× speed with the pitch kept

An 8-second clip with a 440 Hz tone at 2×. The timecodes show every other second; we measured the tone’s pitch before and after.

Four frames at 0, 2, 4 and 6 seconds of the original clip — Before: 8.0 s, tone at 440 Hz.

Four frames at 0, 1, 2 and 3 seconds of the 2× clip, showing source timecodes 0, 2, 4 and 6 — After 2×: 4.07 s, tone at 439.9 Hz — the pitch is kept.

Real run of this tool in Chrome on an 8-second 1920×1080 test clip with a burned-in timecode, measured with ffprobe. No mock-ups.

What speed does to duration, audio, and subtitles

Every timing scales by the same factor.

Speed	A 10-minute video becomes	Voice pitch	Existing subtitles
0.5×	20 minutes	Normal	Twice as early as the speech
1.5×	6 min 40 s	Normal	Late, increasingly
2×	5 minutes	Normal	Twice as late as the speech
4×	2 min 30 s	Normal, very fast	Unusable

Untick “Keep audio” for a silent time-lapse.

Change Video Speed: troubleshooting

Slow motion looks jerky: Each frame is shown longer. Footage shot at 60 or 120 fps gives smoother slow motion.
My subtitles are out of sync: Their timings belong to the original speed. Generate subtitles for the new version.
It will take several minutes: Every frame is re-encoded. Trim to the part you need first.

Privacy and file limits

FFmpeg runs inside this browser tab, so your files are never uploaded. There is no account, watermark, or usage limit; the size limit is your device’s memory: about 750 MB on a laptop and 250 MB on a phone. Re-encoding long videos can take minutes, and the page shows an estimate first.

How to use Change Video Speed

1
Choose a video
MP4, MOV, WebM, or MKV.
2
Pick a speed
0.25×, 0.5×, 0.75× slow it down; 1.25× to 4× speed it up. The new length is shown.
3
Keep or drop the sound
Kept audio is re-timed with its pitch preserved.
4
Change speed and download
The video is re-encoded; long videos show a time estimate first.

Frequently Asked Questions

Can I speed up a video without changing the pitch?: Yes. The sound is time-stretched, not resampled: in our 2× test a 440 Hz tone measured 439.9 Hz afterwards.
How do I make a video 2× speed?: Choose 2× and press Change speed. An 8-second clip became 4.07 seconds.
How slow can I make it?: Down to 0.25×, four times longer than the original.
Can I make a silent time-lapse?: Yes. Pick 3× or 4× and untick “Keep audio”.
Does it work on MOV and WebM?: Yes. The result is always an MP4 (H.264 + AAC).

Need the words, not just the sound?

Faster than 2×: read it

For lectures, meetings, and interviews, a searchable transcript with chapters beats any playback speed.

✓A searchable transcript with timestamps
✓Speaker labels on Pro, so you can see who said what
✓Export TXT, DOCX, PDF, SRT, or VTT

Transcribe it free →Generate subtitles instead