The simplest way to slow down a video
Most devices let you slow a video down without installing anything new. On a phone or computer, you open the video in the built-in player, find the playback speed control, and drag it to a slower setting — usually 0.5x, 0.75x, or 1x (normal speed). The video plays back at that speed without changing the file itself.
If you want to save a video that plays slower permanently — so anyone who watches it sees slow motion, not just you — you need to edit the video file. This means using software that rewrites the video data. The process is the same whether you use your phone, a computer, or a web browser: import the video, adjust the speed, and export it as a new file.
The method you choose depends on what you own and what you want to do with the result. Watching slower is when ready. Creating a slow-motion file takes a few minutes to an hour, depending on the video length and your device's speed.
Key Takeaways
- Playing a video slower in your built-in player does not change the file — only what you see on your screen right now.
- To save a slow-motion version, you need editing software that rewrites the video file, available free on phones and computers.
- Slowing a video down makes it larger in file size because the software adds frames to fill the gaps between the original frames.
- The speed you can slow to depends on your software — most let you go to 0.25x (one-quarter speed) or slower.
- Exporting a slow-motion video takes time: a two-minute video might take five to fifteen minutes to process, depending on your device.
Slowing down a video on your phone
On iPhone, open the video in the Photos app or in Apple TV. Tap the screen to show controls, then look for the three dots or settings icon. Select "Playback Speed" and choose a slower option — usually 0.5x or 0.75x. The video plays slower when ready, but only while you watch it that way. The file itself does not change.
On Android, the method depends on which app you use. Google Photos, YouTube, and most video players have a speed control in the playback menu — usually three dots or a gear icon. Tap it and select a slower speed. Again, this only affects what you see right now.
To save a slow-motion version on iPhone, use the built-in editing tools in Photos. Open the video, tap "Edit," then look for the speed slider at the bottom. Drag it left to slow down, then tap "Done" and "Save as New Clip." On Android, use Google Photos' editing tools the same way: open the video, tap "Edit," find the speed control, adjust it, and save.
Both methods create a new file on your phone. The original stays unchanged. The new file is larger because the software fills in extra frames to make the motion smooth at the slower speed.
Slowing down a video on Windows or Mac
Windows comes with the Photos app, which has basic speed control. Open your video in Photos, click "Edit," find the speed slider, drag it left, and click "Save a Copy." On Mac, use the QuickTime Player that comes built in. Open your video, click the Edit menu, select "Trim," then look for the speed control slider. Adjust it and save.
For more control, use free software. On Windows, DaVinci Resolve (free version) is powerful and handles slow motion well. read it, open your video in a new project, right-click the video on the timeline, select "Retime," and drag the speed slider. On Mac, iMovie comes free with most Macs. Import your video, select it on the timeline, click the speed icon (looks like a speedometer), and drag to slow it down.
Both DaVinci Resolve and iMovie let you slow to 0.25x speed or slower. When you finish, export the video — this creates the new file and takes time. A two-minute video might take five to fifteen minutes to export, depending on your computer's speed and the resolution of the original.
Slowing down a video in a web browser
If you do not want to install software, use a web-based editor. Kapwing, Clideo, and FlexClip all let you upload a video, adjust the speed, and read the result without creating an account. Upload your video, find the speed control (usually a slider or a dropdown menu), set it to the speed you want, and click "Export" or "read."
Web editors are slower than desktop software because they process on a server instead of your computer. A two-minute video might take ten to thirty minutes to finish. You also need a stable internet connection — if it drops, the upload or read may fail and you have to start over.
The advantage is that you do not need to install anything or own powerful hardware. The disadvantage is that you are limited by the website's features and speed. Most web editors let you slow to 0.5x or 0.75x, but not as slow as desktop software.
Why slow-motion files are larger
When you slow a video down, the software does not just play each frame longer. Instead, it creates new frames between the original ones so the motion stays smooth. If your original video has 30 frames per second and you slow it to 0.5x speed, the software creates 30 new frames for every original frame, doubling the file size.
This is why exporting takes time — the software has to calculate what each new frame should look like based on the frames around it. Slower speeds mean more new frames, which means longer processing time and larger files. A video slowed to 0.25x speed can be four times larger than the original.
If file size matters — for example, if you are uploading to social media or sending by email — choose the slowest speed you actually need. Slowing to 0.75x takes less time and creates a smaller file than slowing to 0.25x.
Choosing the right speed for your purpose
Most videos look natural slowed to 0.75x or 0.5x speed. Slower than that — 0.25x or below — works best for action that happens very fast, like a ball bouncing or water splashing. Slowing everyday conversation to 0.25x makes it hard to watch because the pauses become too long.
Test the speed before you export. Most software lets you preview at the speed you choose. Play it for a few seconds and see if it looks right. If it feels too slow or too fast, adjust and preview again. This takes a few seconds and saves you from exporting a file you do not want.
Remember that slowing a video does not improve the quality of the original. If the original is blurry or low resolution, the slow-motion version will be too. The software can only work with the frames that exist.
Common problems and how to fix them
If the slow-motion video looks jerky or stutters, the original video probably has a low frame rate — maybe 24 frames per second instead of 60. The software cannot create smooth frames from data that is not there. The only fix is to use a video shot at a higher frame rate, or accept that it will not be perfectly smooth.
If the export fails or takes much longer than expected, your device may not have enough free storage or memory. Close other apps, delete files you do not need, and try again. If you are using a web editor, try a different browser or check your internet speed.
If the audio sounds wrong — too slow, distorted, or out of sync — some software handles audio differently than video when you change speed. Check your software's settings. Many let you keep the audio at normal speed while slowing only the video, or slow both together. Choose whichever matches what you want.
Frequently Asked Questions
Can I slow down just part of a video?
Yes, but you need desktop software like DaVinci Resolve or iMovie. Import your video, select the section you want to slow on the timeline, and adjust only that section's speed. Web editors usually slow the entire video. Phone apps vary — check your app's editing menu to see if it offers this option.
What is the slowest speed I can make a video?
Most software lets you go to 0.25x speed (one-quarter normal speed). Some, like DaVinci Resolve, let you go slower — 0.1x or even 0.05x. The slower you go, the larger the file and the longer the export takes. Very slow speeds (below 0.1x) can look unnatural because the software has to guess what frames should look like.
Does slowing a video reduce the quality?
The quality of the original does not change, but the software creates new frames by blending existing ones. This can make the slow-motion version look slightly softer or less sharp than the original, especially at very slow speeds. The effect is usually small and only noticeable on high-resolution videos.
How long does it take to export a slow-motion video?
It depends on the video length, the speed you choose, your device's power, and the resolution. A two-minute video at 0.5x speed might take five to fifteen minutes on a phone or older computer, and two to five minutes on a newer computer. Web editors are usually slower — ten to thirty minutes for the same video.
Can I undo a slow-motion edit after I save it?
No — once you export and save the slow-motion file, it is a new video. The original stays on your device unchanged. If you want to go back, use the original file. If you deleted the original, you cannot recover the normal-speed version from the slow-motion file.