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An AVIF file is an image saved in the AV1 Image File Format — a modern, highly compressed format used across the web. It holds the same kind of photo or graphic a JPG would, but at roughly half the file size. The catch: it's new enough that some older apps and devices can't open it yet, which is usually why you landed here. If you just downloaded an image and it saved as something ending in .avif that won't open, you're in the right place. This guide explains what the file is, why you're suddenly seeing them, and exactly how to open one on Windows, Mac, iPhone, Android, and Linux — plus the one fix that works everywhere.

You took a photo on your iPhone, sent it to a friend on Windows, and they replied: "I can't open this." Welcome to the HEIC problem. Since iOS 11, Apple iPhones and iPads save photos as HEIC by default — a format that's smaller and higher quality than JPG, but that a huge amount of software still can't open. The fix is simple: convert HEIC to JPG, the format that works literally everywhere. This guide covers every method, on every device — Mac, Windows, iPhone, Android, Chromebook, and Google Drive — plus how to convert hundreds of files at once, and how to stop your iPhone making HEIC files in the first place. No paid software required. In a hurry? The fastest method that works on any device is a browser-based converter. Convert HEIC to JPG free here — no download, no signup, files auto-delete. The step-by-step OS methods are below if you'd rather use built-in tools.