HEIC explained: what your iPhone saves, where the file opens, and what converting leaves behind

What's actually inside a .heic file

You plug your iPhone into a Windows laptop, copy the vacation folder, and File Explorer shows 214 .HEIC files with blank icons. Nothing is wrong with the photos. The laptop just has nothing installed that can read them.

HEIF, the High Efficiency Image File Format, is a container. The standard behind it, ISO/IEC 23008-12, defines how one file stores a single image, a collection of images or an image sequence, plus the metadata that belongs to each. The first edition was published in December 2017 and the third in July 2025.

The container doesn't dictate the compression. When the picture is coded with HEVC (H.265, the video codec), the file typically gets a .heic extension; coded with AV1, it becomes .avif. Microsoft's developer documentation compares HEIF to TIFF for that reason: one wrapper, several possible codecs.

That is why an iPhone .heic holds more than a picture. When Apple walked developers through the format in 2017, it listed what iOS 11 writes: the main image split into 512 × 512-pixel tiles, a 320 × 240 thumbnail, the EXIF block and, when there is one, a depth map stored as an auxiliary image. Since 2020, Apple says, iPhone photos also carry a gain map used to display the scene in HDR.

Why iPhones have shot HEIC since 2017

Apple announced HEIF on June 5, 2017, as part of iOS 11, and the update shipped on September 19 of that year. iPhone 7 and later capture in the format, along with a range of iPads and Apple Vision Pro.

The pitch is storage. In the iPhone 8 press release Apple promised up to twice the compression and room for twice as many photos and videos; in a developer session it cited an average of 2x over JPEG at the same visual quality. On those numbers, a thousand photos that would fill 3 GB as JPEG need about 1.5 GB as HEIC.

Those are the manufacturer's figures, and an average, so individual photos vary. Sony, which offers HEIF on its cameras, publishes the same ballpark: compression efficiency about twice that of JPEG.

Where HEIC opens and where it fails

Support depends on the operating system, the app and, on Windows, on components that are installed separately.

Windows: two codecs, one of them paid

Microsoft's support page for the Photos app message “You need an extension to use this file” tells you to install two Store extensions, and adds that you need both even if you only care about photos. HEIF Image Extension is free and requires Windows 10 version 17763 or higher, a range that includes Windows 11. HEVC Video Extensions is the paid one: $0.99 in the US store as of September 28, 2026.

Don't assume a PC already has them. Microsoft's developer documentation warns that the HEVC codec might not be available on every machine.

Browsers and upload forms

Safari is the only browser that displays HEIC, which puts support under 15% of global usage on Can I use. The site gives the reason: the format is complicated and costly to license. HEVC is covered by thousands of patents, licensed through pools such as HEVC Advance, run by Access Advance — which in December 2025 also took over the program formerly administered by Via LA.

Upload forms are a separate gate. A file field can declare the types it accepts, and the server checks again on its side. If that list says JPG, PNG and PDF, a .heic is turned away before anything tries to decode it. Every site sets its own list, so check the accepted formats on the form itself.

How to make an iPhone shoot JPEG instead

The switch lives in the Camera settings and only affects what you shoot after flipping it.

1. Open Settings and tap Camera.
2. Tap Formats.
3. Tap Most Compatible. To go back to HEIF later, choose High Efficiency.

What changes afterward

Apple says all new photos and videos will then use JPEG or H.264. Pictures already in your library stay as they were shot, and new files take up more room. Apple itself recommends leaving capture on HEIF, so the switch mostly pays off if you send photos outside the Apple ecosystem every week.

What the iPhone already converts on its own

• USB cable: when you import into Photos, Image Capture or a PC, the media might be converted to JPEG. To get the untouched .heic, Apple's instructions are Settings > Apps > Photos, then scroll down and tap Keep Originals.
• AirDrop, Messages and email: if the receiving device doesn't support the format, the photo may be sent as JPEG automatically.
• iCloud Photos: media keeps its original format.
• On a Mac: open the image in Photos or Preview, choose File > Export, and pick JPEG or PNG.

Menu names come from Apple's support article dated December 5, 2025. The path can change between iOS versions.

Android phones and cameras that save HEIF too

HEIF isn't an Apple exclusive. The Android platform has decoded it since version 8.0, added support for encoding HEIF images in version 9, and from version 10 lets the camera save HEIC on devices that have an HEVC encoder.

On Galaxy phones, Samsung's support page for the S23 series lists a High efficiency pictures switch under Advanced picture options in the Camera settings. It comes with a warning attached: some apps and websites don't support HEIF pictures.

Cameras use the same container and put more into it. Sony records HEIF with 10-bit color depth, in 4:2:0 or 4:2:2, and Canon writes its HEIF files with a .HIF extension. Those travel even less well: Adobe notes that Photoshop doesn't support HIF or HEIC files from Canon cameras.

What conversion drops and what it keeps

JPG, PNG and WebP each hold one image. Anything a HEIC carries as an extra item has nowhere to go in the converted file.

What stays

The main image stays, at full resolution up to 10,000 pixels on the long side, which is LivreImage's limit. For an HDR photo that means the standard-range base Apple stores for backward compatibility: the same scene, minus the extra brightness the iPhone screen was adding.

Keep the original .heic of any photo that matters. The converted file is a copy for sending around, not a replacement.

JPG, PNG or WebP: which one to convert to

The destination decides, not the photo.

• JPG for upload forms, email, print orders and older software. MDN lists it as supported in all versions of Chrome, Edge, Firefox, Opera and Safari. Use HEIC to JPG.
• PNG when the destination demands PNG, or when the picture is headed for more editing and you don't want another lossy pass. PNG discards nothing, so a photo comes out much heavier: HEIC to PNG.
• WebP for publishing on a website or online store. MDN puts lossy WebP at 25–35% smaller on average than a JPEG of similar visual quality, and Can I use shows support at about 97% of global usage: HEIC to WebP.

JPG and lossy WebP discard detail every time they are saved: convert once, straight from the original .heic.