Why doesn’t the “HEIC Convert” app work with my device?

The “HEIC Convert” app only works with devices that are equipped with a processor A10 or better. Currently, only the following devices are supported:

iPhone 7 and 7 Plus
iPhone 8, 8 Plus and X
iPhone XR, XS and XS Max
iPhone 11, 11 Pro and 11 Pro Max

iPad Pro 12.9 (2nd generation)
iPad Pro 10.5 (June 2017)
iPad Pro 9.7 (March 2018)
iPad Pro 11 (October 2018)
iPad Pro 12.9 (October 2018)
iPad Air (March 2019)
iPad (September 2019)

Are the HEIC pictures compatible with all apps?

As with every kind of new technology, not all apps and systems support this new format from the start. Right now, only iOS 11 and macOS High Sierra natively support this format and only a few apps (Dropbox and Camera+ for example). However, you can share HEIC pictures (see the next question).

What happens when I want to share a HEIC picture?

You can share any HEIC picture, including with incompatible apps. This is because iOS will automatically convert the HEIC picture to a JPEG picture on the fly, which means that no matter what version of What’s App, Messenger, Mail, etc. that your correspondent uses, they will receive a compatible JPEG image. In future, apps and systems will become compatible with this new format and no conversion will be necessary.

Will I lose something with the conversion from JPEG to HEIC?

No, you don’t lose any quality, resolution, GPS coordinates, EXIF information, date creations, etc. However, if the pictures have been edited with the Photos app you will not be able to go back to the original picture. Once the pictures are in the HEIC format, they are editable with the app Photos or any other app that support the HEIC format.

How long will it take me to convert all of my pictures from JPEG to HEIC?

It is just a question of how many pictures you have and which device you are using. For example, with an iPhone 7, conversion will take approximately 1.1 second per picture versus 0.7 second for an iPhone 8. Depending on your device, converting 1,000 pictures from JPEG to HEIC will take 18 to 11 minutes (app must be open). New iPhone XR or XS released at the end of 2018 perform better (10% faster). Same for iPhone released in September 2019, speed of conversion is increased by 10%.

How much space will I save?

That all depends on the kind of pictures you are converting, but on average (see main page), the “HEIC Convert” app will save you about 40% on storage space, in some cases, even 80%.

Will it convert all of my JPEG images?

Yes, all single pictures that have been taken by an iPhone and saved as a JPEG will be converted. You can also convert panoramas that are a fusion of several pics. However, JPEG pictures that are bigger than 20 MBytes cannot be converted.

Why doesn’t it migrate Portrait, Live and Burst images?

Apple uses special encoding around those particular types of images and the app doesn’t support it.

When I try to view pictures with the Preview application from my Mac with macOS High Sierra after the conversion, I only see files with the extension JPG, not HEIC,. Why is that?

The Preview application on Mac makes a conversion of HEIC pictures on the fly. However, Preview can open native HEIC files, but you will need to transfer those files with other software, like Dropbox (other apps and software will be compatible with this format in time). In addition, note that AirDrop also converts HEIC pictures to JPG when you make a transfer from your device to your Mac.

What will happen to the pictures that are stored on iCloud?

As no Internet browser can display HEIC pictures at the moment, all of your pictures will be saved as JPEGs on iCloud, which means that you won’t be able to save storage space on iCloud.

Why do I need to manually delete the pictures that are in the ‘Recently Deleted’ album? Can’t the app do that automatically?

Due to iOS restrictions, the app cannot perform this task. Only the user can.

I have an iPhone 6s or 6s Plus running iOS 11 and I don’t have the Format option High Efficiency (HEIC) available in the camera settings. Why?

Even if your iPhone natively supports the HEIC format, iOS doesn’t support shooting a picture in that format, for some obscure reason (performance probably).

With iOS 11.3, the app makes bigger pics

The iOS 11.3 did introduce some undocumented changes and you need to update HEIC Convert to the latest version (1.0.5 or better).

Optimize iPhone Storage compatibility issues

When the option "Optimize iPhone Storage" is activated, your iPhone keeps small images locally and the original pictures are stored in iCloud. This feature is not compatible with the HEIC format and therefore the app doesn't work when such feature is activated.