The basic method: change the playback speed in your media player

The simplest way to make a video play in slow motion is to use the playback speed control built into whatever program is already playing it. Most media players — whether that's Windows Media Player, VLC, QuickTime, or your phone's default video app — have a speed button or menu option that lets you watch at 0.5x, 0.75x, or other fractional speeds. This does not change the video file itself; it only changes how fast it plays back when you watch it.

On Windows, open the video in Windows Media Player, right-click the video, and look for "Play speed" or a similar option in the menu. On Mac, QuickTime has a speed control in the View menu. On iPhone or Android, open the video in your default video app, tap the three dots or settings icon, and select playback speed. The exact location varies by app, but the feature exists in nearly all of them.

This method works for watching videos slower, but it does not save a new slow-motion version of the file. If you close the player, the video returns to normal speed the next time you open it. If you want to share a slow-motion version with someone else or use it in another project, you need to actually edit the video file.

Key Takeaways

  • Most media players have a built-in speed control that lets you watch videos slower without changing the file itself.
  • To create a permanent slow-motion version, you need video editing software like DaVinci Resolve (free), Adobe Premiere, or iMovie (Mac only).
  • Slowing a video down makes it longer; a 10-second clip at 0.5x speed becomes 20 seconds.
  • The quality of slow motion depends on the original frame rate — videos shot at 60 fps or higher look smoother when slowed than videos shot at 24 fps.

Creating a permanent slow-motion file with free software

DaVinci Resolve is the most accessible free option for creating a slow-motion video file. Download it from Blackmagic Design's website (the free version is called DaVinci Resolve), import your video, and drag it onto the timeline. Right-click the clip on the timeline, select "Change Clip Speed", and enter a percentage — 50% makes it half speed, 25% makes it quarter speed. Export the result as an MP4 or other format, and you have a new video file that plays in slow motion.

On Mac, iMovie comes pre-installed and works similarly. Drag your video into a new project, click the video on the timeline, click the speed icon (it looks like a speedometer), and drag the slider to the left to slow it down. File > Export lets you save the result as a new video file.

On Windows, Windows Photos (the built-in app) has basic speed controls. Open the video, click Edit & Create, then Edit with Photos, and look for the speed slider. The controls are less detailed than DaVinci Resolve, but it works for simple slow-motion edits.

Using paid software for more control

Adobe Premiere Pro and Final Cut Pro (Mac only) are industry-standard tools that give you precise control over slow motion. In Premiere, drag your clip to the timeline, right-click it, select "Speed/Duration", and change the percentage. You can also use the Retime tool to create variable slow motion — speeding up one part of a clip and slowing down another.

These programs cost money (Premiere is part of Adobe's Creative Cloud subscription; Final Cut Pro is a one-time purchase), but they offer features that free software does not: the ability to slow motion without losing quality through frame interpolation, precise frame-by-frame control, and the ability to apply effects while the video is slowed.

Understanding frame rate and why it matters for slow motion

A video's frame rate is how many still images per second it contains. Most videos are shot at 24 fps (film standard) or 30 fps (broadcast standard). When you slow a 30 fps video to half speed, the player shows each frame twice as long, which can look choppy because there are not enough frames to fill the time smoothly.

Videos shot at 60 fps or higher look much smoother when slowed down because there are more frames to work with. If you are filming something specifically to slow down later — a sports moment, a water splash, a person jumping — shoot at 60 fps or higher if your camera supports it. When you slow it to half speed, you still have 30 frames per second, which looks natural.

Some editing software can use frame interpolation to create in-between frames and fill the gaps, making slow motion from lower frame rates look smoother. This is a paid feature in most software and works better on some types of footage than others.

Exporting your slow-motion video in the right format

After you have edited your video to slow motion, you need to export it in a format that will play on the devices you want to use it on. MP4 is the safest choice — it plays on Windows, Mac, iPhone, Android, and most websites. MOV works well on Mac and iPhone. WebM is smaller but does not play on all devices.

When you export, the software will ask you to choose a resolution (1080p, 4K, etc.) and a bitrate (how much data per second). Higher numbers mean better quality but larger file sizes. For a video you are sharing online or via email, 1080p at a standard bitrate is usually enough. If you are archiving it or using it in another project, export at the highest quality your software offers.

Slowing down only part of a video

If you want to slow down just one section — say, the moment a ball hits a bat in a sports clip — you can split the video into segments and apply different speeds to each. In DaVinci Resolve, right-click the clip on the timeline and select "Blade" to cut it at a specific point. Then right-click each segment and change its speed independently. The segments will play back-to-back at their different speeds.

In Adobe Premiere, use the Retime tool (right-click the clip and select "Retime") to create speed changes at specific points in the timeline. You can make a clip slow down gradually, speed up gradually, or jump between speeds. This is useful for dramatic effect — normal speed for the lead-up, slow motion for the impact, normal speed again for the aftermath.

Common mistakes and how to avoid them

The most common mistake is slowing down a video shot at 24 fps and expecting it to look smooth. It will not. If you are working with footage you did not shoot yourself, check its frame rate before you slow it down. In most editing software, you can see this in the clip properties. If it is 24 or 30 fps and you need smooth slow motion, frame interpolation is your only option, and results vary.

Another mistake is exporting at a lower resolution than the original to save file size. A 4K video slowed down to half speed is still 4K — the resolution does not change, only the playback duration. If you export it at 1080p, you lose detail. Export at the original resolution unless you have a specific reason not to.

Finally, do not assume that slowing a video down will make audio sound natural. Most editing software will slow the audio along with the video, which makes voices sound like they are underwater. If your video has important audio, you may need to mute it and add music or sound effects instead, or keep the audio at normal speed while the video plays slow.

Frequently Asked Questions

Can I slow down a video on my phone without downloading software?

Yes. Open the video in your phone's default video player and use the playback speed control — usually a three-dot menu or settings icon. This only changes how it plays; it does not save a new file. To save a slow-motion version, you need a video editing app like CapCut (free on iOS and Android) or iMovie (Mac only).

What is the difference between slowing a video and shooting in slow motion?

Shooting in slow motion means recording at a high frame rate (60 fps or higher) so that when you play it back at normal speed, it appears slow. Slowing a video means taking normal footage and playing it back at a reduced speed. Slow-motion footage looks smoother because it has more frames to work with.

Will slowing a video down make it look blurry?

No, slowing a video does not blur it. The image quality stays the same; only the playback speed changes. However, if the original video was shot at a low frame rate (24 fps), slowing it down may look choppy because there are not enough frames to fill the time smoothly. Frame interpolation can help, but it is not perfect.

How much longer does a video become when I slow it down?

A video slowed to 50% speed (half speed) becomes twice as long. A 10-second clip becomes 20 seconds. A video slowed to 25% speed becomes four times as long. The math is straightforward: divide the original speed by the new speed to find the multiplier.

Can I undo slow motion after I have exported the file?

No. Once you export a slow-motion video as a file, that speed is baked in. To change it back, you would need to import it into editing software again and speed it up. Keep your original file and your editing project file so you can make changes later if needed.