FileConverterPro

Video Speed

Speed up or slow down videos online for free. 0.25x slow motion to 4x fast forward. Audio pitch adjusts automatically. No signup.

Drag & drop a file here, or click to browse

MP4, MOV, WebM, MKV, AVI, M4V · up to 500 MB

How to use Video Speed

  1. 1. Upload your video. Drag in an MP4, MOV, WebM, MKV, AVI, or M4V file — up to 500 MB.
  2. 2. Pick a speed. Choose a preset (0.25x–4x) or drag the slider for precise control down to 0.05x increments.
  3. 3. Preview the estimate. We show the estimated output duration so you know exactly how long the result will be.
  4. 4. Process & download. Hit 'Change Speed' — we re-encode on the server with audio pitch correction and deliver a ready MP4.

FAQ

Does the audio change when I speed up or slow down?

Yes — audio pitch adjusts proportionally. At 2x the audio plays at double speed, at 0.5x it plays at half speed. The server re-encodes both tracks together.

What is the maximum speed?

You can go from 0.25x (¼ speed slow motion) up to 4x. The slider gives you fine-grained control in 0.05x increments.

Will slow motion look smooth?

It depends on your source frame rate. A 60fps source slowed to 0.5x will still be 30fps and look smooth. A 24fps source at 0.25x will be 6fps, which looks choppy. For best slow-mo, shoot at 60fps or higher.

Can I slow down just part of the video?

Not yet — this tool changes the speed of the entire video. Trim first with our Video Trimmer, then apply slow-mo to that clip.

Where is my file processed?

On our EU server. Files are auto-deleted within 1 hour. We don't share, analyse, or store them.

How long does processing take?

Usually a few seconds to a couple of minutes, depending on video length and resolution. Longer slow-motion outputs take proportionally longer.

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