What is HEIC and why does my iPhone use it?

HEIC (High Efficiency Image Container) is Apple's default photo format since iOS 11, based on the HEIF standard using HEVC compression. iPhones use it because HEIC files are approximately 50% smaller than equivalent JPEG files while maintaining the same visual quality. This saves significant storage space — critical for devices where storage is limited and expensive.

How do I open HEIC files on Windows?

Windows 10 (version 1809+) and Windows 11 support HEIC natively through the HEIF Image Extensions from the Microsoft Store. For older Windows versions, convert HEIC files to JPEG using an online converter tool. Most modern photo editing software (Photoshop, GIMP 2.10+, Lightroom) can open HEIC files directly.

Does converting HEIC to JPEG lose quality?

Yes, there is a small quality loss when converting HEIC to JPEG because both are lossy formats. However, the loss is typically imperceptible in normal viewing. For maximum quality preservation, convert HEIC to PNG (lossless) or TIFF. When converting to JPEG, use quality settings of 90-95% for a good balance of quality and file size.

Can I stop my iPhone from saving photos as HEIC?

Yes. Go to Settings > Camera > Formats and select 'Most Compatible' instead of 'High Efficiency.' This changes the default format to JPEG. Keep in mind that JPEG files are approximately twice the size of HEIC files, so your storage will fill faster. You can also keep HEIC and set automatic JPEG conversion during transfers in Settings > Photos.

HEIC Format Guide: Everything You Need to Know About Apple's Photo Format

If you own an iPhone, your photos are almost certainly stored in HEIC format — a format that many other devices and services struggle to open. HEIC offers remarkable compression efficiency, saving gigabytes of storage space over JPEG, but compatibility remains its biggest challenge. This guide explains what HEIC is, how it compares to other formats, how to convert it, and when you should (or should not) use it.

February 23, 2026 13 min read Image

What Is HEIC? The Technical Breakdown

HEIC stands for High Efficiency Image Container. It is a file format based on the HEIF (High Efficiency Image Format) standard, using HEVC (H.265) video compression to encode still images. Apple adopted HEIC as the default photo format starting with iOS 11 and macOS High Sierra in 2017.

Key Technical Features

HEVC compression: Uses the same codec as 4K video, achieving ~50% smaller files than JPEG
16-bit color depth: Supports wider color gamut (P3) vs. JPEG's 8-bit sRGB
Transparency: Supports alpha channels, unlike JPEG
Multiple images: A single HEIC file can contain multiple images (burst photos, depth maps)
Non-destructive edits: iOS stores editing instructions within the file without overwriting originals
Depth data: Portrait mode depth maps are embedded directly in the file

HEIC vs. Other Image Formats

Feature	HEIC	JPEG	PNG	WebP	AVIF
Compression	Lossy/Lossless	Lossy	Lossless	Both	Both
File size (relative)	1x	2x	5-10x	1.1x	0.8x
Color depth	16-bit	8-bit	16-bit	8-bit	12-bit
Transparency	Yes	No	Yes	Yes	Yes
Animation	Yes	No	No	Yes	Yes
Apple support	Full	Full	Full	Safari 14+	Safari 16+
Windows support	10 1809+	Full	Full	Partial	Limited
Web compatibility	Very limited	Universal	Universal	95%+	85%+

How to Convert HEIC Files

Online Conversion

The fastest approach is using an online converter. Upload your HEIC files and download them as JPEG, PNG, or WebP. Our image converter supports HEIC to all major formats.

On iPhone

Change default format: Settings > Camera > Formats > Most Compatible
Auto-convert during transfer: Settings > Photos > Transfer to Mac or PC > Automatic
Share as JPEG: When sharing via AirDrop, email, or Messages, iOS can auto-convert

On Mac

Preview app: Open HEIC file > File > Export > Choose JPEG/PNG
Automator batch conversion: Create a workflow to convert folders of HEIC files
Third-party apps: Many free apps handle batch HEIC conversion

On Windows

Install HEIF extensions: Free from Microsoft Store for Windows 10/11
Photos app: Opens HEIC natively after extension installation
Online tools: Use the WebP converter or image converter in any browser

When to Use HEIC vs. JPEG

Scenario	Recommended Format	Reason
iPhone storage savings	HEIC	50% smaller files
Sharing with Android users	JPEG	Universal compatibility
Uploading to websites	WebP or JPEG	Browser compatibility
Professional printing	TIFF or PNG	Lossless quality
Social media posting	JPEG or PNG	Platform support
Apple-only workflow	HEIC	Best quality-to-size ratio
Long-term archiving	HEIC or TIFF	16-bit color preserved

Image Conversion Tools

Free Online Converters:

Image Converter — Convert between all formats
WebP Converter — Convert to/from WebP
Image Compressor — Reduce file sizes
Image Resizer — Resize photos
Bulk Image Resizer — Batch processing
Image Editor — Full editing suite

Frequently Asked Questions

High Efficiency Image Container — Apple's default format since iOS 11 using HEVC compression. ~50% smaller than JPEG at the same quality, with 16-bit color and transparency support.

Install HEIF Image Extensions from Microsoft Store (free for Windows 10 1809+ and 11). Or convert HEIC to JPEG using an online converter.

Small quality loss (both are lossy). Use JPEG quality 90-95% for imperceptible difference. Convert to PNG for lossless quality.

Yes — Settings > Camera > Formats > Most Compatible. Photos save as JPEG but are ~2x larger. Alternatively, keep HEIC and enable auto-conversion during transfer.

Image Tools

Image Converter
Image Compressor
WebP Converter
Image Resizer
Image Editor

Related Guides

Image Formats Explained
iPhone Photos
Compression Tips