HEIC vs JPG: why your iPhone photos won't open everywhere

What HEIC and HEIF are

HEIF stands for High Efficiency Image File Format. It is a container: a file that holds one or more pictures plus information about them. HEIC is the file extension you see on these photos, such as IMG_0001.heic. For videos, Apple uses the matching HEVC format, also known as H.265.

Apple introduced these formats with iOS 11 and macOS High Sierra. According to Apple, they compress better than JPEG and H.264, so photos and videos take up less storage on the device and in iCloud Photos while keeping the same visual quality. That is the whole reason for the switch: more photos in the same space.

Why HEIC files cause problems

JPG is the long-established photo format: every major web browser displays it, and nearly every upload form accepts it. HEIC is newer and not every device, app or website reads it, so a file that opens on the iPhone can show an error or be refused somewhere else.

Apple's own sharing tools work around this. When you send photos by AirDrop, Messages or email and the receiving device doesn't support the newer formats, the iPhone may send them as JPEG instead. When you import photos over a USB cable into a computer, they may also be converted to JPEG. The trouble starts when you pick the original file yourself, for example in a website's upload box or from a cloud folder.

Some official forms are strict about this. The online passport photo rules for Canada and the US visa photo rules both ask for a JPEG file, so a HEIC photo has to be converted before it can be uploaded.

The Most Compatible setting

If you would rather the camera saved JPG from the start, Apple documents a setting for it. Open Settings, tap Camera, tap Formats, then choose Most Compatible. New photos are then saved as JPEG and new videos as H.264. To go back, choose High Efficiency in the same place.

The setting only affects photos taken after the change. Photos already in your library stay as they are. There is a second, separate setting for copying photos to a computer by cable: in Settings, Apps, Photos, the option Keep Originals stops the iPhone from converting them to JPEG during the transfer.

When it makes sense to keep HEIC

Converting is not an upgrade. A JPG made from a HEIC photo can't contain more detail than the original, and because HEIC compresses better, a JPG of the same visual quality needs more space. So keep the HEIC originals in your photo library and treat JPG as a copy for sharing.

• Keep HEIC for your own archive, iCloud Photos and sharing between Apple devices, which handle it natively.
• Make a JPG copy for upload forms, Windows computers, printing services and people who can't open the file.
• Make a PNG copy only when another tool specifically asks for PNG; for photos it gives much bigger files.

What converting keeps and what it doesn't

When you convert, the picture itself is decoded and saved again as a new JPG. A few things are worth knowing before you send the result anywhere.

• Quality: the converter starts at a high Quality setting so the JPG looks the same as the original. Lowering it gives a smaller file.
• Photo details: under Photo details (EXIF) the default is Keep date taken and camera, remove location. You can also choose Remove everything, or Keep everything, including location if you want the GPS position in the copy.
• Orientation: the photo is turned upright in the pixels themselves, so it doesn't appear sideways in apps that ignore the rotation tag.
• Live Photos: a Live Photo records about 1.5 seconds before and after the shot. The converter makes a still JPG from the photo; the moving part is not kept, in the same way Apple's Mail sends a Live Photo as a still image.

Converting without uploading

Many online converters upload your photos to their server to do the work. That matters for private pictures, IDs and family photos. The HEIC to JPG tool decodes HEIC directly in your browser, so the photos never leave your device. You can add a whole batch, or a folder on a desktop browser, and download the results one by one or together as a ZIP.