TidyByteYou usually do not need to delete photos to make room on your iPhone. A photo is a few MB; a minute of 4K video is roughly 170–190 MB, so a handful of long videos can outweigh thousands of pictures. Start with your biggest videos (shrink them or move them off the phone), then offload apps you rarely open. Clear downloads and old message attachments, and understand what "Optimize iPhone Storage" really does before relying on it.
Are my photos really what is filling my iPhone?
Open Settings › General › iPhone Storage and look at the bar. The Photos section counts photos and videos together, which is why it looks so big.
In practice the videos take most of it. Here are the rough numbers for Apple's default High Efficiency format:
- One photo: a few MB.
- One minute of 1080p video at 30 fps: roughly 60–65 MB.
- One minute of 4K video at 30 fps: roughly 170–190 MB.
So a ten-minute 4K recording of a school play takes as much room as a very large number of photos. To see all your videos in one place, open Photos › Albums › Media Types › Videos.
How do I shrink big videos without losing them?
You have two choices for a large video: move it somewhere else, or replace it with a smaller copy of the same clip.
Move it off the phone
Copy the video to a computer with a cable, or to a cloud storage service, then delete it from the phone. Deleted videos go to Recently Deleted and still take up space for 30 days; the space comes back when that album is emptied.
Replace it with a smaller copy
A smaller copy at 1080p or 720p looks almost the same on a phone screen and can be far smaller. Apple's free iMovie app can export a video at a lower resolution, and the Shortcuts app has an Encode Media action that does the same. Save the smaller copy, check it plays, then delete the original if you are happy. Our guide to making a video small enough to send walks through both.
Which apps can I offload without losing anything?
Offloading removes the app itself but keeps its documents and data. The icon stays on your Home Screen with a small cloud symbol; tap it and the app reinstalls with everything as you left it.
- Open Settings › General › iPhone Storage. Apps are listed largest first.
- Tap an app you have not opened in months and choose Offload App.
- Start with the largest ones. Games and video apps often free the most.
To let iOS do this automatically, turn on Offload Unused Apps under Settings › App Store (on newer iOS, Settings › Apps › App Store). Apps you have not used in a while are offloaded when space runs low.
What downloads and attachments hide inside apps?
Some of the biggest space users are files you downloaded and forgot about.
- Streaming, music, podcast and map apps. In Settings › General › iPhone Storage, tap the app. If "Documents & Data" is large, open the app and remove its downloads from inside its own downloads section.
- Messages. Go to Settings › General › iPhone Storage › Messages › Review Large Attachments. Tap Edit, select old videos and photos you do not need, and delete them.
- Files. Open the Files app and check the Downloads folder for old PDFs, videos and zip files.
- Safari. Downloads land in the same Files folder. Clearing website data in Settings › Safari helps a little, but it is not usually where the space is.
What does "Optimize iPhone Storage" really do?
Under Settings › Photos (on iOS 18 and later, Settings › Apps › Photos), with iCloud Photos on, you can choose Optimize iPhone Storage. Here is what it actually means:
- Your full-quality originals are stored in iCloud.
- Your phone keeps smaller versions and downloads the original when you open or edit it.
- It needs an iCloud plan with enough room for your whole library. The free 5 GB allowance is rarely enough, so this is a paid feature in practice.
- It is not a backup. iCloud Photos syncs, so a photo deleted on your phone is deleted from iCloud and every other device too (after its 30 days in Recently Deleted).
- You need an internet connection to see full-quality originals.
Used with a big enough plan, it works well and keeps every photo. Just go in knowing that it moves the problem to iCloud rather than removing it.
Do Live Photos, HDR and 4K take more space?
Yes, all three.
- A Live Photo is a still plus a 3-second video, so it is about twice the size of a normal photo. Tap the Live Photo button in the Camera to turn it off for a shot, and use Settings › Camera › Preserve Settings to keep it off.
- 4K and 60 fps video is much larger than 1080p at 30 fps. Change the default in Settings › Camera › Record Video. Most family videos are perfectly good at 1080p.
- HDR Video adds size too. If you never watch on an HDR screen, turn it off in the same menu.
- Make sure Settings › Camera › Formats is set to High Efficiency, which is Apple's smaller HEVC format.
These settings do not shrink what you already have, but they stop the problem coming back next month.
Frequently asked questions
Does compressing ruin video quality?
Not in a way most people notice on a phone. Going from 4K to 1080p, or re-encoding in HEVC, keeps the clip watchable and clear. If a video matters a great deal, keep the original on a computer as well.
Does "Optimize iPhone Storage" delete my photos?
No. It replaces the full-quality copy on your phone with a smaller one and keeps the original in iCloud. Nothing is deleted. But it does need an iCloud plan with room, and deleting a photo anywhere deletes it everywhere.
Do Live Photos take more space?
Yes. Each one includes a short video alongside the still, so it is about twice the size of a plain photo. Turning Live Photos off in the Camera stops new ones from taking the extra room.
If I delete a video from my iPhone, is it gone from iCloud too?
If iCloud Photos is on, yes, it goes to Recently Deleted on all your devices and is removed for good after 30 days. Copy anything precious to a computer or another service before you delete it.
Bottom line. Your photos can stay. Deal with the handful of big videos, offload apps you never open, clear old downloads and attachments, and change your camera defaults so the space does not fill up again. Everything you delete sits in Recently Deleted for 30 days first. For the full safe order, see iPhone storage full? What to delete first.
Finds the big videos, duplicates and screenshots. Every deletion is yours to approve, and everything goes to Recently Deleted for 30 days. Free to download.
