Can I slow down or speed up a video online for free?

Yes. Choose a preset or select Custom speed and enter a rate from 0.1× to 4×. The tool exports the complete video at the selected playback speed and keeps the original frame dimensions.

Does changing speed change the video resolution?

No. The width and height stay the same. Only playback timing changes, so slower speeds create a longer video and faster speeds create a shorter one.

Will the audio speed change too?

Yes. Browser-only FFmpeg applies a matching audio tempo filter, so the audio follows the selected speed while staying synchronized. Extreme speed changes can still affect perceived pitch and quality.

Is speed adjustment done locally?

Yes. The video is decoded and exported in your browser without being uploaded to a server.

Why does a slow-motion export take longer?

A slower speed produces a longer output duration, so the browser must render more playback time before the export is complete.

How do I make a video 2x speed?

Choose 2× in the speed controls and export. A 60-second source becomes approximately 30 seconds while keeping the original frame width and height.

Can I slow down a video to 0.5x?

Yes. Choose 0.5× to create an approximately half-speed version. The output is about twice as long, but the tool does not invent new frames like an optical-flow slow-motion editor.

Does this video speed changer change the resolution?

No. Speed changes affect timing only. The output canvas uses the source video dimensions, so it does not crop, stretch, or resize the frame.

Free tools

Free Video Speed Changer

Speed up or slow down a video with presets or a custom 0.1× to 4× rate, preview the new duration, and export locally in your browser.

Copy-paste outputs

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Tool 01

Video Speed Changer

Speed up or slow down a video while preserving the original frame dimensions.

Playback speed

Change video speed without changing its frame size

Make a video slower or faster while preserving the original frame dimensions. The output duration changes with the selected speed.

Drop a video here

MP4, WebM, MOV, and other browser-supported video files up to 500 MB. Your file stays on your device.

How it works

Video Speed Changer: methodology and worked example

How this tool computes its result

The speed changer applies a timing filter with browser-only FFmpeg. Choose a preset or enter a custom rate from 0.1x to 4x; a rate below 1x creates slow motion and a rate above 1x creates a faster video. The source width and height stay unchanged. The expected output duration is the source duration divided by the selected rate, and you can keep the source container or choose MP4, MOV, or WebM.

Worked example

A 60-second tutorial exported at 0.5x becomes approximately 120 seconds and keeps the original frame size. Exporting the same source at 2x produces approximately 30 seconds. For a sports replay or a gesture that is hard to see, 0.5x is a practical slow-motion choice; for a long screen recording, 2x produces a compact fast-forward version without changing the pixels per frame.

When not to use this tool

Do not use this as a frame-interpolating slow-motion tool. It changes playback timing and records the browser-rendered frames; it does not create new in-between frames or provide speed ramps within one video. For broadcast-quality optical-flow slow motion, variable speed sections, pitch correction, or batch work, use a dedicated editor or transcoding pipeline.

Common mistakes

- Assuming a slower setting makes a normal low-frame-rate video smoother. It changes timing but cannot invent missing motion detail.
- Forgetting that output duration changes: 0.5x is about twice as long, while 2x is about half as long.
- Treating audio behavior as identical across every browser and codec. The browser must expose a capturable audio track for audio to follow the playback.

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