HEIC: what it is, why it won't open, and how to convert

What HEIC actually is

HEIC stands for High Efficiency Image Container. It is a wrapper format that holds image data compressed with the HEVC codec — the same family as H.265 video. Apple shipped HEIC as the default iPhone photo format with iOS 11 in 2017, and most iPhones since then save every new photo as HEIC unless the user has explicitly switched the camera to "Most Compatible".

The format's advantage is size. A HEIC photo is typically half the file size of the same image saved as JPG, at the same visible quality. That is why your iPhone storage lasts longer than it used to and why iCloud Photos uses less of your monthly quota. Newer Android phones have begun adopting HEIC for the same reason.

The compatibility problem

HEIC is a better format than JPG. It is also less compatible with everything that is not a recent iPhone. That gap is the source of every "my photo won't open" message you have ever sent a relative.

HEIC on Windows

Windows did not natively support HEIC until late Windows 10, and even then you needed to install the HEIF Image Extensions from the Microsoft Store. Older Windows machines, many email clients, banking portals, government forms, and corporate file scanners still reject .heic uploads outright. The most common symptom: you attach a photo to an email or upload it to a form, and you get either "unsupported format" or a silent rejection.

HEIC on Android

Android 10 and newer can decode HEIC at the OS level. Google Photos, the built-in Gallery, and most third-party viewers handle it without issue. Android 9 and older have no native HEIC support — the file opens as a black box or refuses to open at all. WhatsApp, helpfully, converts HEIC to JPG automatically when an iPhone sends a photo to an Android device, which masks the problem for casual sharing but reappears when the file is transferred via email, USB, or cloud storage in its original form.

HEIC in web forms and old apps

Any site or app that was built before 2018 — and many that were built after — will reject HEIC. Government portals, university application forms, old job boards, banking and KYC uploads, and most legacy printers and photo kiosks accept JPG only. This is not going away soon. Converting to JPG before upload is the universal workaround.

The three ways to fix HEIC

1. Convert HEIC to JPG (the universal fix)

Best when you handle HEIC files occasionally. Drop the HEIC into a converter, save the JPG, attach or upload as needed. Done.

The safest converter is one that runs in your browser without uploading your file. The Fileoholic HEIC to JPG converter uses a WebAssembly build of libheif — your photo is decoded locally, converted to JPG or PNG locally, and offered as a download. No upload, no signup, no file-size limit. You can verify the no-upload claim in your browser's Network tab.

Avoid online converters that upload your file to their server. For holiday photos that hardly matters. For ID scans, medical records, or private documents, an upload means your file passes through someone else's machine — and you have no way to verify their "deleted after 1 hour" promise.

2. Install HEIC support on your OS

Best when you handle HEIC files every day. On Windows, install the free HEIF Image Extensions from the Microsoft Store. Pair with the HEVC Video Extensions (small one-time fee) if you also want HEIC live photos with motion to play. Once installed, Windows Explorer previews HEIC files and the Photos app opens them like any other image.

On Mac, HEIC support is built in — Preview opens HEIC, and File → Export lets you save as JPG or PNG directly.

For Android 9 or older, third-party gallery apps from the Play Store add HEIC viewing — but at that point upgrading the device or converting in the browser is usually the cleaner path.

3. Make your iPhone stop saving HEIC

Best when you regularly share with Windows users or upload to forms that reject HEIC. On iPhone: Settings → Camera → Formats → pick Most Compatible. From then on, every new photo is saved as JPG. Old photos remain HEIC and still need converting if you want to share them.

This trades disk efficiency for compatibility. If you take thousands of photos a year, you give up the 2x storage savings HEIC provides. For most users, that trade is worth making — at least until the rest of the world catches up.

HEIC vs JPG quality: does conversion lose quality?

HEIC to JPG conversion always loses a small amount of image data, because JPG is itself a lossy format. You are decoding the original HEIC pixels and re-encoding them as JPG, which throws away some data each time.

The good news: the loss is invisible at JPG quality 90 or higher. Your eye cannot tell the difference unless you zoom in on smooth gradients like sky or skin. Most online converters default to JPG quality 80, which is a bit aggressive on photos with subtle gradients. For best results, use a converter that lets you adjust the JPG quality and push it to 92-95.

For zero loss after the decode step, convert HEIC to PNG instead. PNG is lossless, so once the HEIC decoder has produced the raw pixel data, PNG stores it exactly. The downside is file size — PNG outputs are typically 3 to 5 times larger than the original HEIC. Use PNG for archival or when the photo will be edited further; use JPG quality 90 for everything else.