Step 1 Get to know the amount of free space.

At first, we need to know the amount of free storage you have on your iPhone/iPad. This will help you decide whether you must delete more apps, photos, or messages to free up some storage. Launch the Settings app and select General > iPhone/iPad Storage, and the amount of storage space you've used is shown in the colored bar at the top.

Below it, you may see a list of recommendations for optimizing storage, for example, by reviewing and deleting large attachments. These recommendations are followed by a list of installed apps and the amount of storage each one uses. The list also tells you when you last used each app, allowing you to easily find and delete the apps that you haven't used for a while or not at all.

Step 2 Identify non-essential apps, data or photos to remove.

You can delete the unwanted photos, or other files directly. Here we focus on apps.
For the installed apps, you have the option to offload apps or delete apps. Offloading apps can free up storage used by the apps when it was installed but will still keep the data and documents saved by the apps. Open the Settings app > App Store > turn on the Offload Unused Apps.

Deleting Apps will delete both the App and the data stored by the app on your device, thus freeing up more space for your iPhone. But if an app you use a lot is taking up a lot of space, it's worth checking if you can clear any cache associated with it via an Eraser tool.

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The space taken by messages can also be huge. Since iOS 11.4 and macOS 10.13.5, you can store messages in iCloud and can access them from any device. So you do not need to store these old messages. Deleting messages might sound like a long-winded process, but you don't need to do this individually. You can kill them quickly by telling iOS to purge any messages that have been on the device for longer than a stipulated period - anything older than 30 days, or anything more than a year old. Follow these simple steps to clear all messages from your iPhone at once.

1. Open the Settings app.
2. Scroll down to Messages and tap it.
3. Under Message History, tap "Keep Messages".
4. There are three options: 30 Days, 1 Year, and Forever: choose the first or second option.
5. Confirm that you want to delete the old messages and then tap the "Delete" button.

If you select the 30-day option you'll delete the majority of messages on your iPhone and make substantial storage savings. If you want to modify the job, you can open the Messages app, hit Edit, select the small number of remaining conversations and tap Delete.

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The photos that you keep on your iPhone or iPad in full-resolution naturally take up storage space on your device, which can fill up quickly depending on the available storage capacity and how much content you have. You can replace them with smaller versions. The full-resolution photo will still be available in iCloud, and will automatically download it when you access or edit the photo. The steps are as follows:

1. Launch Settings on your ‌iPhone‌ or ‌iPad‌.
2. Scroll down and tap Photos.
3. Make Sure ‌iCloud Photos‌ is toggled on.
4. Tap Optimize iPhone/iPad Storage.

And if you have used the Burst Mode to take photos, check and remove the duplicated photos. The Burst Mode of the camera on your iOS device will capture a series of photos in rapid succession. It's a great way to shoot an action scene, but it also generates a lot of unwanted images, so it's better to pick out the best image for safekeeping, and delete the rest to save on storage space.

In some cases, you can find your photo library getting bigger even when you haven't been taking pictures on your device. For example, the media that people share with you over WhatsApp may be automatically saved to your iPhone's Camera Roll. Fortunately, you can easily prevent this default behavior by disabling "Save to Camera Roll" in WhatsApp's in-app settings. And another way is to export the media from WhatsApp to your computer.

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Video is a big space-consumer on iPhone/iPad. Following are two ways to reduce the space it takes.

Way 1: Customize the resolution of the video

Video will also take large space on the iPhone/iPad. You can customize the resolution and frame rate of recorded video to reduce the file size.

1. Launch the Settings app on your iOS device.
2. Scroll down and tap Camera.
3. Tap Record Video.
4. Select a resolution and frame rate to record video. Note that shooting the 4K option takes the most space. If you want to significantly reduce video file size, choose between 720p and 1080p HD at 30 fps.

Way 2: Delete the downloaded videos

Steps:

1. Launch the Settings app on your iOS device.
2. Tap General.
3. Tap iPhone/iPad Storage.
4. Under "Recommendations," tap Review Downloaded Videos
5. To delete a video from your device, swipe leftwards across it in the list, then tap the Delete button. Alternately, to delete multiple videos, tap Edit in the top-right corner of the screen, tap the red minus buttons next to the videos you want to remove, then tap Done.

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Another effective way of permanently freeing up iPhone storage is by using Syncios iOS Eraser. It’s a versatile tool that helps you manage your iPhone Storage.

What Can Syncios iOS Data Eraser Do for You:

☛ How to free up the spaces in one-click

Step 1 Download Syncios iOS Eraser on your computer and install it. Then on the start-up interface of Syncios Toolkit, please choose iOS Data Eraser to download this program. After the installation, tap iOS Data Eraser again to launch this program.

Step 2 Connect your iPhone to the computer and launch the tool. And please remember to turn off Find My iPhone firstly. If you meet the problem with the device connection, please take reference to the guide on this page.

Step 3 Once your device is connected successfully, you will see the main window of Free Up Space by default. There are 6 options as "Junk files", "Temp Files", "Camera Roll", "Photo Library", "Large Files" and "Apps".

Step 4 Click on the Quick Scan button to let the program analyze and scan your device. If it is the first time, the scan will take few seconds. When it is finished, you will see a result list of scan.
It shows the spaces taken by Junk files, Temporary File, Camera Roll, Photos Library, Large Files and Apps.

Step 5 You can click the Clean button beside the group you want to clear so as to delete these files and free up space.

To remove the above files is not enough. We also need to clear the deleted files.

Erase Deleted Files on iPhone

Do you know the deleted files may still be stored in your iPhone/iPad? Yes, the files you've deleted on iPhone could still exist on iPhone and take spaces. Syncios iOS Eraser Pro can help in finding and clearing up all these deleted files and promise they will not come back anymore.

Step 1 Launch Syncios iOS Eraser and switch to Erase Deleted Files panel.

Step 2 Connect your iPhone/iPad to the computer through a USB cable. When it connects successfully, click Erase to start the process and scan all deleted files on your iPhone.

Step 3 When the program finishes scanning, you just need to select contents and click Erase Now to start the erasing process.

Syncios iOS Eraser supports scanning out 12 categories of deleted files concealed on your iPhone. Deleted Files include messages, contacts, call history, calendar reminders, notes, Safari history, photos & video, bookmarks, voice memos, Viber, WhatsApp and Wechat can all be erased on your iPhone completely.