# How to Compress a Video on iPhone

> Compare iMovie, Shortcuts, camera settings, browser tools, and on-device apps to reduce iPhone video size without guessing about quality.

- Author: Antoine van der Lee (https://videocompression.app/about/)
- Published: 2026-09-21
- Updated: 2026-10-07
- Canonical URL: https://videocompression.app/blog/how-to-compress-video-on-iphone/

## Key takeaways

- Trim in Photos first: removing footage you do not need saves space without re-encoding anything.
- iMovie can export a smaller copy of one video at a lower resolution such as 720p, 540p, or 360p.
- A Shortcuts workflow suits repeated compression, and lower camera settings prevent large files in the first place.
- Be careful with browser uploaders: a lock icon secures the connection, not what happens to your file afterwards.
- Whichever method you use, check the compressed copy before you delete the original.

Compressing a video on iPhone means creating a smaller copy by reducing its resolution, changing its codec, lowering its data rate, or shortening it. The best method depends on whether you need to send one clip, automate a repeated task, or recover storage across your library.

There is no single best compressor for every situation. I would use iMovie for a free one-off export, Shortcuts for a workflow I want to reuse, and a dedicated app when I need to compare many videos and make informed trade-offs. Before choosing, it helps to understand what actually makes a video smaller.

## The quickest ways to reduce video size on iPhone

If you only want the short answer, these are the fastest options:

- **Trim the clip in Photos** to remove footage you do not need. Apple explains how in its guide to [trimming videos](https://support.apple.com/guide/iphone/trim-video-length-adjust-speed-and-edit-audio-iph1d1344a2d/ios).
- **Export a lower resolution with iMovie** when you need one smaller copy to send. The iMovie section below walks through it.
- **Record at 1080p or in High Efficiency** so future videos start smaller. See the camera settings section.
- **Compress many videos at once** with an on-device app such as [Video Compressor](https://apps.apple.com/app/id6810118769) when the goal is freeing storage rather than sending a single clip.

Not sure how large a clip will be before you start? The [iPhone video size calculator](/tools/iphone-video-size-calculator/) estimates it from the length and resolution.

## What makes an iPhone video large?

Four factors have the biggest impact on video size:

- **Duration:** a shorter video contains less data.
- **Resolution:** 4K contains many more pixels than 1080p or 720p.
- **Frame rate:** 60 frames per second records more frames than 30 fps.
- **Codec and data rate:** HEVC can represent similar visual quality with less data than H.264, although the result depends on the content and encoder settings.

Compression is always a trade-off. You can keep the same dimensions and encode more efficiently, or reduce resolution and frame rate for a larger saving. A screen recording with small text may need more care than a casual clip you only want to send in a message.

You can inspect a video before changing it. Open it in Photos and swipe up or tap the information button to see its file size and capture details. The panel does not list the codec or frame rate, so use the file size to judge which videos are worth compressing. Apple documents what is shown in its guide to [viewing photo and video information](https://support.apple.com/guide/iphone/see-photo-and-video-information-iph0edb9c18f/ios).

## Compress a video with iMovie

Apple recommends iMovie when you want to reduce the size of a video after recording it. It is free, keeps the workflow on your iPhone, and lets you choose a lower export resolution.

The current steps are:

1. Open iMovie and tap **Start New Project**.
2. Choose **Movie**, select your video, and tap **Create Movie**.
3. Tap **Done**, followed by the share button.
4. Choose **Save or Share Video**, then tap **Options**.
5. Select a lower resolution, such as 720p, 540p, or 360p.
6. Tap **Done** and save the result to Photos or Files.

Apple’s [guide to compressing video with iMovie](https://support.apple.com/en-us/127765) explains that a lower resolution reduces file size but can also reduce quality. Apple suggests 540p for social media and 360p for text messaging. Those are useful starting points, not universal rules: text, faces, motion, and the original recording quality all affect the result.

iMovie is a good choice when you have one video and do not mind creating a project. It also lets you trim and edit the clip before export. The downside is that the workflow has several steps, and resolution is a fairly blunt control. You do not get a library-wide view of which videos occupy the most space.

Be careful with HDR as well. iMovie enables HDR output by default when a project contains HDR media. Apple advises turning HDR off when compatibility matters more, since not every target device displays HDR correctly. The [iMovie sharing guide](https://support.apple.com/guide/imovie-iphone/share-your-movie-as-video-file-kna4501dba9/ios) lists the available export controls.

## Build a reusable Shortcuts compressor

Shortcuts is useful when you want the same action to appear in the Photos share sheet. You can build a workflow around the **Encode Media** action and save its output back to Photos or Files.

A basic shortcut looks like this:

1. Create a new shortcut and enable **Show in Share Sheet**.
2. Limit accepted input to media.
3. Add **Encode Media** and pass it the shortcut input.
4. Choose a smaller output size, or configure it to ask each time.
5. Add **Save to Photo Album** or **Save File**.
6. Run the shortcut from a video’s share sheet.

Apple’s Shortcuts documentation confirms that **Media** input includes video and audio files, and that [transform actions convert content](https://support.apple.com/guide/shortcuts/transform-actions-apd1d9413cfb/ios). However, Apple does not publish a detailed consumer guide for every current Encode Media option. Labels and available sizes can vary by OS version, so check the action shown on your own iPhone instead of assuming an online recipe matches it exactly.

The advantage is speed after the initial setup. The disadvantage is limited feedback: a shortcut can create the output, but it does not naturally guide you through a visual quality comparison or help you identify the best candidates across a large library. Keep the original until you have watched the encoded copy from start to finish.

## Record smaller videos from the start

The most efficient compression happens before you press Record. Go to **Settings > Camera > Record Video** and choose a lower resolution or frame rate when you do not need 4K or 60 fps. In the Camera app, you can also tap the resolution and frame-rate controls in Video mode on supported models.

Apple explicitly notes that [higher resolutions and faster frame rates create larger files](https://support.apple.com/guide/iphone/record-a-video-iph61f49e4bb/ios). For everyday family clips, 1080p at 30 fps may be a reasonable starting point. Keep 4K, 60 fps, or specialized modes for recordings where their extra detail or motion quality matters to you.

You can also go to **Settings > Camera > Formats**:

- **High Efficiency** records video using HEVC, also known as H.265.
- **Most Compatible** records video using the older H.264 format.

Apple recommends High Efficiency for space savings, while Most Compatible works with a broader range of older devices and software. Changing this setting only affects new recordings. It does not shrink videos already in your library.

If storage is the concern, check HDR Video too. Apple’s current compression guidance suggests choosing a resolution below 1080p, turning off HDR Video, and selecting High Efficiency for consistently smaller recordings. I would not apply all three changes by default. Start with resolution and frame rate, then decide whether HDR is valuable for what you record.

## Should you use a browser uploader?

Web-based compressors can be convenient because you do not have to install an app. You select a video in Safari, upload it, wait for processing, and download the compressed result.

The important word is **upload**. Your video leaves the iPhone and is processed by someone else’s server unless the service clearly documents local browser processing. That can be acceptable for a non-sensitive clip, but it is a meaningful privacy and time trade-off for personal videos. Large uploads also depend on your connection and may consume mobile data.

Before using a browser tool, verify:

- where processing happens;
- how long uploaded and generated files are retained;
- whether the service imposes size, duration, or resolution limits;
- whether the download keeps audio, HDR, metadata, and the orientation you expect;
- whether the advertised price applies to your actual file.

I would avoid uploading private family, work, health, or location-sensitive footage to a service whose privacy terms I have not read. A generic lock icon only secures the connection; it does not tell you what happens to the file after arrival.

## Compress a library with Video Compressor

A dedicated app becomes useful when the problem is no longer “send this one clip,” but “understand what is using my iPhone storage.” [Video Compressor](https://apps.apple.com/app/id6810118769) scans your library, surfaces candidates such as large, long, and 4K videos, and offers High Quality, Balanced, and Max Saving presets.

The app estimates savings before compression and lets you compare the original with the actual compressed result. Compression runs on your iPhone, and video content is not uploaded to SwiftLee servers. If an original only exists in iCloud, Apple PhotoKit may need to download it first.

The original is not silently removed. The compressed copy is saved first, and deleting the original remains a separate action that uses Apple’s confirmation. This workflow is the main reason to choose a dedicated compressor: you can make a storage decision with the source, result, and measured sizes in front of you.

It is still not the right tool for every case. iMovie is enough for a single free export, and Shortcuts can be quicker once you have built a personal automation. Video Compressor is most relevant when you have several large videos, want on-device processing, and prefer guided quality controls over assembling the workflow yourself.

## Check quality before deleting anything

Whichever method you choose, verify the result before removing the original:

1. Compare file sizes in the Photos information panel.
2. Watch scenes with movement, faces, text, and low light.
3. Check audio sync and volume.
4. Confirm that the video opens in the app or device where you plan to use it.
5. Keep the original until you are satisfied with the copy.

Trimming is also worth doing before re-encoding. Photos lets you drag the beginning and end of the timeline, then choose **Save Video** or **Save Video as New Clip**. Apple’s [video trimming instructions](https://support.apple.com/guide/iphone/trim-video-length-adjust-speed-and-edit-audio-iph1d1344a2d/ios) explain the difference. Removing footage you do not need saves space without asking an encoder to preserve it.

You can use the [iPhone video size calculator](/tools/iphone-video-size-calculator/) to estimate Apple’s published iMovie export ranges before choosing a resolution.

## Conclusion

iMovie is the clearest free method to compress one video on iPhone. Shortcuts works well for a repeatable share-sheet action, while lower camera settings prevent large files in the first place. Browser uploaders trade installation for an upload and a third party’s privacy policy.

If large videos are filling your library, Video Compressor gives you a more focused workflow: find the worthwhile candidates, estimate the saving, compress on-device, and compare the real result before deciding whether to delete an original. Whatever you choose, keep compression reversible until you have checked the output. If you are deciding what to do with the original afterwards, read [can you delete the original after compressing a video](/blog/delete-original-after-compressing-video/), and if iCloud Photos is involved, [how iPhone storage and iCloud storage differ](/blog/iphone-storage-vs-icloud-storage/).

Thanks!

## Frequently asked questions

### What is the best way to compress a video on iPhone?

It depends on the job. Use iMovie for a free one-off export, Shortcuts for a repeatable workflow, and a dedicated on-device app when you want to compare many videos and recover storage across your library.

### What makes an iPhone video so large?

Duration, resolution, frame rate, and the codec and data rate. 4K and 60 fps files hold much more data than 1080p at 30 fps, and HEVC can represent similar quality with less data than H.264.

### Does compressing a video reduce its quality?

Usually yes, to some degree, because compression trades detail for size. Compare the copy with the original on motion, text, and audio before you delete anything.

### Should I upload a private video to a free online compressor?

I would avoid it for private family, work, health, or location-sensitive footage unless you have read the service's privacy terms. On-device methods keep the file on your iPhone.

## Sources

- [How to compress a video on iPhone or iPad](https://support.apple.com/en-us/127765)
- [Share your movie as a video file in iMovie on iPhone](https://support.apple.com/guide/imovie-iphone/share-your-movie-as-video-file-kna4501dba9/ios)
- [Record a video with your iPhone camera](https://support.apple.com/guide/iphone/record-a-video-iph61f49e4bb/ios)
- [Using HEIF or HEVC media on Apple devices](https://support.apple.com/en-us/116944)
- [Use Transform actions in Shortcuts on iPhone or iPad](https://support.apple.com/guide/shortcuts/transform-actions-apd1d9413cfb/ios)