Change Video Speed Online

1. 1

   Upload your video

   Select the video you want to adjust. Common formats include MP4, MOV, WebM, and more. The file loads.

2. 2

   Choose speed

   Pick a preset (e.g. half speed, double speed) or type a custom speed between 0.25× and 4×. Higher speed shortens output duration; lower speed lengthens it.

3. 3

   Preview

   Use the preview player to check the source file before exporting.

4. 4

   Choose output format

   Select MP4, WebM, or MOV when available. MP4 is often the most compatible.

5. 5

   Apply and download

   Run the speed change. Download the new file when finished.

Adjusting speed helps you skim long content faster, study action in slow motion, match pacing for editing, or hit platform duration targets without re-shooting.

Benefits of speed control

• Save time: Watch or share shorter exports when you speed up.
• Learn and analyze: Slow down for tutorials, sports, or language practice.
• Creative pacing: Emphasize moments with slow motion or quick cuts.
• Fit delivery: Lengthen or shorten to match slots or file size goals.
• One file: Process one video at a time with clear speed settings.

Play a recording faster and, by default, everything in it rises in pitch — every voice climbs, and at 2× speech is about an octave above where it started. That happens because the simplest way to speed audio up is to play its samples more quickly, which shortens every wave in the recording along with the recording itself. This tool does not do that by default. It resegments the waveform instead, finding points where the sound repeats itself and overlapping them, so the same number of wave cycles per second survives into a shorter file. The result keeps the speaker's voice recognisably theirs at any speed in the range.

The three audio choices

• Keep pitch: the default. Speech, music and effects hold their pitch while the clip gets shorter or longer.
• Shift pitch: the classic sped-up or slowed-down effect, where the pitch rides along with the speed. Wanted often enough to be a button rather than a bug.
• Mute: drops the audio track entirely. Useful when the clip is going under a music bed anyway.

A compressed video frame carries no clock of its own. The times at which frames appear live in the container around them, not in the picture data — which means changing how fast a video plays can be done by rewriting those times and leaving every frame exactly as it was. When the format you export to can carry the video already inside your file, that is what happens here: no frame is decoded, no frame is compressed again, and the picture that comes out is the picture that went in, byte for byte. Choosing a different output format forces a re-encode instead, because the frames have to be rebuilt in a form the new container accepts.

How to keep the copy path

• Leave the format on "Same as source": the container then already accepts what is inside your file.
• Keep motion on "Keep frames": blending has to build new frames, which means encoding them.
• Leave the frame-rate ceiling clear of the result: dropping frames from a copied stream would break it, so a binding ceiling forces a re-encode.
• Watch the note above the button: it says which of the two will run before you press it, not after.

Slowing a clip down does not give it more pictures than it was shot with. A thirty-frame second played at quarter speed still has thirty pictures spread over four seconds, so each one sits on screen four times as long and motion visibly steps. There are two honest answers. The first is to shoot faster: footage captured at 60 or 120 frames a second has spare pictures to spend, and slows down cleanly without any help. The second, for footage you already have, is to build the missing pictures — and blending fades each frame into the next so the step becomes a soft transition rather than a jump. It is not the same as an effects suite tracking every moving object, and fast motion across the frame will look soft rather than sharp. On ordinary handheld and talking-head footage it is a large improvement for no extra shooting.

When blending helps and when it does not

• Below 1× it is worth trying — that is where stepping shows.
• Above 1× it does nothing useful, because speeding up has spare frames rather than missing ones.
• Gentle motion, faces and handheld drift blend well.
• A fast pan or an object crossing the frame will look soft where a real slow-motion camera would look sharp.
• Blending always re-encodes, so it gives up the copy path and its original picture quality.

The tool rebuilds your video so playback occurs at the chosen rate. Output duration is roughly inversely related to speed — for example, 2× speed typically yields about half the original length.

Speed change process (overview)

• Upload: Load the source video.
• Set speed: Use a preset or custom multiplier.
• Choose format: Pick MP4, WebM, or MOV when offered.
• Export: Encode with the new timing.
• Download: Save the adjusted file.

Useful context before you export.

Key points

• Supported custom range in the tool is typically 0.25× to 4×.
• Faster speed reduces viewing time of the exported file; slower speed increases it.
• Export quality depends on source material and encoder settings.
• Audio is adjusted to match the video speed in the export pipeline.
• Processing time depends on clip length and device performance.

Guidelines for better results.

Quality and audio

• Preview the source before committing to a long export.
• Extreme slow or fast speeds may affect how natural speech sounds.
• Choose output format based on where the file will play.
• Keep an original copy before chaining many edits.
• For critical edits, verify sync on the final export.

Common use cases

• Education: Slow down demos; speed up review sessions.
• Sports / analysis: Slow motion for technique review.
• Social media: Fit pacing to short-form trends.
• Archiving: Create a faster-viewing summary copy.
• Accessibility: Adjust pacing for comprehension.

The exporter adjusts timestamps (and audio timing) so the decoded playback rate matches your multiplier, then writes a new file in the selected format.

Technical process

• Decode: Video and audio tracks are read from your file.
• Timing: Samples are time-scaled so the output plays at the target speed.
• Encode: A new video is encoded with updated timing and codec settings for the chosen format.
• Output: You download the result locally; formats often include MP4, WebM, or MOV.

Powered by optimised video encoding pipelines.

• Video compressor
• Video resizer
• Video cutter
• Video cropper
• Video to GIF
• Switch container

  Match codec and container to where you will publish