How To Slow Down A Video On iPhone 15: Simple Steps & Tips

Slowing down a video on an iPhone 15 is simple. Pick the clip in Photos if it was recorded in Slo-mo, and use Edit to change the slow section. For any other video, open iMovie, create a new project, add your clip, use the speed control to reduce playback speed, then export the result back to Photos. If you prefer more control, apps like CapCut or Slow Fast Slow give frame-level adjustments. This quick guide walks you through both built-in and app-based methods so you can slow motion a clip in minutes.

How To Slow Down A Video On iPhone 15 – Step by Step Tutorial

The following steps show two main paths. Use Photos Edit when the clip was shot in Slo-mo, and use iMovie for any clip you want to slow down. Each step tells you exactly what to tap and why.

Step 1, Open the Photos app and find the video you want to slow down.

Tap the Photos app, browse your library, and select the clip you plan to edit.
Look at the video details to see if it was recorded in Slo-mo, which shows as Slo-mo in the video thumbnail or in Info. If it is a Slo-mo recording, you can adjust the slow part right in Photos. If it is a regular video, continue to the iMovie steps below.

Step 2, If the clip is Slo-mo, tap Edit to change the slow-motion section.

In Edit mode you will see vertical lines on the video timeline that mark the slow-motion range, drag those handles to adjust where the slow motion starts and ends.
This method only works for videos recorded using the Slo-mo camera mode, and it does not change the clip’s overall length, it only changes which part plays slowly.

Step 3, If the clip is not Slo-mo, open iMovie and create a new Movie project.

Launch iMovie, tap Create Project, pick Movie, and then tap the video you want to edit, then tap Create Movie at the bottom.
If you do not have iMovie installed, download it free from the App Store before starting these steps.

Step 4, Step 4, Tap the clip in the timeline and then tap the speed control icon to slow it down.

Drag the speed slider left to decrease the speed, then play the preview to check the result.
iMovie shows you a percentage of the original speed, so 50 percent is half-speed and 25 percent is quarter-speed, experiment until the motion looks right.

Step 5, Step 5, If you want to keep audio normal, mute the clip in iMovie and add background audio or a separate voice track.

Tap the audio controls to lower the original clip volume, then use the plus button to add music or a narration track that stays in natural pitch.
Slowing audio along with video will lower the pitch and make voices deep, so replacing or adjusting audio is the usual fix.

Step 6, Step 6, Tap Done and export your slowed video by using Share, then Save Video to put it back in Photos.

Choose the export resolution that matches your needs, such as 1080p or 4K, then wait for the save to finish.
Your edited video will appear in Photos under Recents and the Albums section, ready to share or upload.

Step 7, Step 7, Use a third-party app like CapCut or Slow Fast Slow for frame-by-frame control or more speed options.

Install the app, import your clip, and use its speed tools to apply more precise slow motion or keyframe speed changes.
Third-party apps often give finer control than iMovie, and they also let you stabilize, add effects, or correct audio pitch in more ways.

After you complete these actions, your slowed video will be saved to the Photos app or shared to other apps you select. You can play it back, share it, or re-edit it anytime. Keep in mind that slowing a clip can change the audio pitch, file size, and playback length, so you may want to mute the original audio or add fresh music. If you used iMovie or another app, the edited version will be a new file and the original will remain unchanged in Photos.

How To Slow Down A Video On iPhone 15 – Tips

• Use the Photos Edit method only for true Slo-mo recordings, it is the fastest route.
• In iMovie, preview at each speed step so you do not overdo the effect.
• Mute the original audio if slow motion makes voices sound unnatural, then add music or a voice track.
• Export at the same resolution as the original to avoid quality loss unless you need a smaller file.
• If you need very smooth slow motion, record at a higher frame rate next time, like 120 or 240 fps.
• Keep backups of original clips before exporting edits, just in case you want to start over.

Frequently Asked Questions

Can I slow down any video on my iPhone 15?

Yes, you can slow down any video by using iMovie or a third-party editor, but the built-in Photos Edit only adjusts videos shot with Slo-mo mode. For a regular clip, use iMovie to change overall speed.

Will slowing a video change the audio pitch?

Usually, yes, slowing the clip lowers the audio pitch and makes voices sound deeper. To avoid this, mute the clip and add background music or record a new voiceover at normal speed.

Do I need to install extra apps to slow down a video?

Not always. If the video is a Slo-mo recording you can edit it in Photos. For general speed changes you will need iMovie, which is free from the App Store, or any third-party app with speed controls.

How do I keep the video smooth when slowing it down?

Start with footage that was recorded at a higher frame rate, like 120 or 240 fps. Higher frame rates give more frames to spread out when you slow the video, which keeps motion smooth.

Will the edited video replace the original?

No, exporting an edited version creates a new file and leaves your original untouched in the Photos app, unless you explicitly overwrite or delete the original.

What export settings should I choose?

Pick the same resolution and frame rate as the original if you want to preserve quality, or choose a lower setting to save space. Higher resolution means a larger file size.

Summary

1. Open Photos and pick your video.
2. Edit Slo-mo in Photos if recorded in Slo-mo.
3. Create an iMovie project for regular clips.
4. Use iMovie speed control to reduce playback.
5. Mute or replace audio to fix pitch issues.
6. Export with Share, Save Video.
7. Use third-party apps for advanced control.

Conclusion

Knowing how to slow down a video on iPhone 15 gives you a powerful way to add drama, highlight details, or make action scenes feel cinematic. The built-in Photos app is handy when you have a true Slo-mo recording, because it lets you drag the slow-motion section like sliding a curtain over the timeline. For anything else, iMovie is your go-to free option, putting a simple speed slider at your fingertips so you can preview and tweak without fuss. Third-party editors are great when you need frame-level precision, advanced pitch correction, or creative speed ramps that change over time. Think of slowing a clip like stretching a rubber band, you can pull it a little for a subtle effect or a lot for a dramatic slow-down, and the tools you choose control how smooth and natural that stretch looks.

If you plan to make a habit of slow-motion edits, try to record at higher frame rates next time, because the extra frames are like extra ingredients in a recipe, they let you build richer, smoother results. Also pay attention to audio, because raw slowed audio often sounds distorted, and swapping in new music or a fresh voiceover will usually sound much better. Finally, back up your originals, experiment freely, and share your best shots with friends or on social media. If you want a follow-up, I can walk you through a specific example step by step on your iPhone 15, or suggest apps that give frame-by-frame timing and pitch correction. Try one clip now and you will see how quickly the effect transforms your footage.