Source: How to save a HEIC image as JPEG on iPhone
Apple has built-in functions for camera formats for taking pictures and videos in HD quality (HEIC) and sequence pictures. However, you can use HEIC instead of JPEG files, and your videos will automatically get HEVC instead of H264.
The advantage of these new functions is that you can convert your photos into lower quality for little space in high quality. You can save more pictures and videos on your iPhone device. These features were introduced in 2015 and may be better from an earlier format like GIF. GIFs are more useful to present animated videos and photos on mobile phones today for an update on social media like Facebook, Twitter, Instagram, etc.
HEIC and HEVC files are still not generally supported on all devices. If you want to take HEIC photos with your iPhone, you want to send them to friends or family who are using Windows computers.
Here are some methods for exporting your HEIC and HEVC files to JPEG files and H264 files. If you continuously send pictures to relatives and friends who are not using recently launched or current devices, you can export your photos to JPEG format. You get the same image quality in a small space. How to save Apple iPhone and Apple iPad images exported from HEIC file format to JPEG.
1. Click Settings.
2. Press on camera.
3. Hit formats.
4. Change the camera format from the default setting to "Compatible". This is a highly efficient setting that allows you to automatically save images in JPEG format and videos in H264 file format.
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