Lossy or lossless: which compression should I use for web images?

Use lossy (JPG, WebP, AVIF) for photographs — the human eye barely notices the difference at quality 80–85, and file sizes are 5–20× smaller. Use lossless (PNG, WebP-lossless) for screenshots, UI mockups, logos and anything with sharp edges or text — lossy creates ugly artifacts around boundaries.

Does conversion preserve EXIF metadata (camera, GPS, date)?

It depends on the tool: ImageMagick and FFmpeg copy EXIF by default, while cwebp drops it unless you pass -metadata all . KaijuConverter strips metadata server-side after conversion to protect your privacy — if you need to keep camera or GPS data, use a desktop tool you control.

Lossy or lossless: which compression should I use for web images?

Use lossy (JPG, WebP, AVIF) for photographs — the human eye barely notices the difference at quality 80–85, and file sizes are 5–20× smaller. Use lossless (PNG, WebP-lossless) for screenshots, UI mockups, logos and anything with sharp edges or text — lossy creates ugly artifacts around boundaries.

Does conversion preserve EXIF metadata (camera, GPS, date)?

It depends on the tool: ImageMagick and FFmpeg copy EXIF by default, while cwebp drops it unless you pass -metadata all . KaijuConverter strips metadata server-side after conversion to protect your privacy — if you need to keep camera or GPS data, use a desktop tool you control.

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HEIC/HEIF Format: Complete Guide to Apple's High Efficiency Image Format

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HEIC/HEIF Format: Complete Guide to Apple's High Efficiency Image Format

PC By Pablo Cirre • Updated May 7, 2026

What Is HEIC/HEIF Format?

HEIC (High Efficiency Image Container) and HEIF (High Efficiency Image File Format) are modern image formats developed by the Moving Picture Experts Group (MPEG) and standardized as ISO/IEC 23008-12. Apple adopted HEIF as the default photo format for iPhones starting with iOS 11 in 2017, making it the format used for most photos taken on Apple devices worldwide.

The two terms are related but distinct:

HEIF is the container format specification — it defines how image data is organized in the file
HEIC is the variant that uses HEVC (H.265) video codec for image compression — this is what iPhones use
AVIF is a related newer variant using the AV1 codec (not HEVC)

HEIF files use either .heic or .heif extensions (some Android/Samsung devices use .heif). Despite different extensions, they use the same underlying container structure.

Why HEIF Exists: The Problem With JPEG

JPEG was developed in 1992 for hardware capabilities of that era. By the early 2010s, cameras were capturing photos at 12+ megapixels with wide color gamuts, HDR capability, and computational photography features (Live Photos, burst sequences, depth maps) that JPEG simply cannot represent:

Limitation	JPEG	HEIF Solution
Bit depth	8 bits/channel	Up to 16 bits/channel
Color gamut	sRGB only	Display P3, Rec. 2020, HDR
Transparency	❌	✅ Alpha channel
Multiple images	❌	✅ Sequences, bursts, Live Photos
Depth maps	❌	✅ Embedded depth data
File size	Baseline	~50% smaller at equal quality
Metadata	EXIF only	EXIF, XMP, MPEG-7
Animation	❌	✅ (HEIF sequences)

HEIF Container Structure

HEIF uses the ISO Base Media File Format (ISOBMFF) container — the same container used by MP4 video files. Inside this container, HEIF organizes data using "boxes" (also called "atoms"):

HEIF File
├── ftyp box — File type and compatible brands (heic, mif1, etc.)
├── meta box — Metadata container
│   ├── hdlr box — Handler type ('pict' for images)
│   ├── dinf box — Data information
│   ├── iloc box — Item location (byte offsets for each image/item)
│   ├── iinf box — Item information
│   ├── iprp box — Item properties (transforms, color info, auxiliary)
│   │   ├── ispe — Image spatial extents (width/height)
│   │   ├── colr — Color information (ICC profile or nclx)
│   │   ├── hvcC — HEVC decoder configuration
│   │   ├── pasp — Pixel aspect ratio
│   │   └── irot — Image rotation
│   ├── grpl box — Item grouping (defines sequences, alternatives)
│   └── iref box — Item references (thumbnail → primary, auxiliary → primary)
└── mdat box — Media data (raw compressed image data)

This structure allows HEIF to store multiple items (images, thumbnails, depth maps, gain maps) in a single file with clear relationships between them.

HEVC Compression in HEIC

HEIC images are compressed using HEVC (High Efficiency Video Coding / H.265), the same codec used for 4K/8K video. HEVC achieves roughly twice the compression efficiency of H.264/AVC at the same visual quality.

For still images, HEVC can encode individual frames using intra-frame coding (no inter-frame prediction needed). The compression uses:

CTU (Coding Tree Units) — flexible block sizes from 4×4 to 64×64 pixels
Intra prediction — predicts pixel values from neighboring decoded pixels (35 directions in HEVC vs. 9 in H.264)
Transform coding — DCT and DST transforms (up to 32×32 in HEVC)
Entropy coding — CABAC (Context-Adaptive Binary Arithmetic Coding)
In-loop filtering — deblocking and SAO (Sample Adaptive Offset) filters

This sophisticated compression pipeline is why HEIC files are roughly half the size of equivalent JPEG files at the same perceived quality.

HEIF Multi-Image Capabilities

One of HEIF's most powerful features is storing multiple images in a single file with defined relationships:

Live Photos (Apple)

A Live Photo is a HEIF file containing:

The main still image (HEIC compressed)
A short video clip (HEVC encoded)
Metadata linking the two

The .heic extension is used even for Live Photos; the video portion is stored as a separate moov box within the container.

Burst Sequences

Multiple photos from a burst shot stored in one file with one designated "primary" image. Reduces storage overhead vs. individual JPEG files per frame.

Depth Maps

Portrait mode photos store the main image plus a monochrome depth map used for rendering the bokeh (background blur) effect. The depth map is referenced as an auxiliary image item.

Gain Maps (HDR)

Apple's implementation of HEIF HDR stores a "gain map" alongside the standard dynamic range base image. Tone mapping applies the gain map on HDR-capable displays while showing the base image on SDR screens — a single file adapts to the display.

Image Sequences / Animations

HEIF supports animation by storing multiple image items and a track structure (like video), enabling GIF/APNG replacement with HEVC quality.

HEIF Color and HDR

HEIF's color capabilities far exceed JPEG:

Feature	JPEG	HEIF
Bit depth	8 bpc	8, 10, 12, 16 bpc
Color spaces	sRGB	sRGB, Display P3, Rec. 2020, ACES, custom ICC
HDR support	❌	✅ HLG, PQ, gain maps
Wide gamut	❌	✅

iPhone cameras use Display P3 wide color gamut by default. HEIC files correctly embed the color profile, ensuring accurate color reproduction on P3-capable displays (all modern iPhones, iPads, Macs, and many other devices).

Compatibility and Support

Native HEIC Support

Apple: Full support on macOS High Sierra+, iOS 11+, iPadOS, tvOS, watchOS
Windows 11: Built-in HEIC viewer; Windows 10 requires the free "HEIF Image Extensions" from the Microsoft Store
Android: Support varies; Samsung, Google Pixel, and most modern Android phones can view HEIC. Some older Android versions cannot.
Linux: Support via libheif; most distros don't include it by default

Web Browser HEIC Support

Safari: ✅ Native
Chrome: ✅ (Chrome 85+)
Firefox: ❌ (as of 2024, still no native HEIC support)
Edge: ✅ (via Windows HEIF codec)

For maximum web compatibility, convert HEIC to JPEG or WebP before displaying on websites.

Software Support

Software	HEIC Import	Notes
Photos (macOS/iOS)	✅ Native	Full fidelity including Live Photos
Lightroom Classic	✅	Full editing
Photoshop	✅ (2019+)	Requires HEVC codec on Windows
GIMP	✅ (via plugin)	Requires libheif
ImageMagick	✅	Requires libheif
Affinity Photo	✅

Converting HEIC Files

HEIC → JPEG (macOS)

# Using sips (built-in macOS tool)
sips -s format jpeg photo.heic --out photo.jpg

# Batch convert entire folder
for f in *.heic; do sips -s format jpeg "$f" --out "${f%.heic}.jpg"; done

HEIC → PNG (macOS)

sips -s format png photo.heic --out photo.png

HEIC → JPEG (Windows)

Use the built-in Photos app: Open → Export → Save as JPEG. Or use ImageMagick:

magick convert photo.heic photo.jpg

HEIC → WebP (all platforms via ImageMagick)

magick convert photo.heic photo.webp

HEIF vs. AVIF

AVIF is a newer image format using the AV1 codec instead of HEVC. Google and others developed AVIF as a royalty-free alternative to HEIC:

Feature	HEIC	AVIF
Codec	HEVC (H.265)	AV1
Patent royalties	Yes (HEVC pool)	No (royalty-free)
Compression efficiency	High	Slightly higher
Encoding speed	Fast	Slow
Browser support	Safari, Chrome, Edge	Chrome, Firefox, Edge
Apple ecosystem	✅ Native	Limited
Web adoption	Growing	Growing faster

For web use, AVIF is increasingly preferred due to its royalty-free status. For Apple device workflows, HEIC remains the standard.

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Frequently Asked Questions

Windows 10 does not include HEIC support by default because the HEVC video codec (used for HEIC compression) requires a licensed patent. You can add HEIC support for free by installing the "HEIF Image Extensions" from the Microsoft Store (search for it, it's free). On Windows 11, basic HEIC viewing is built in. Alternatively, convert your HEIC files to JPEG using an online converter or the free iMazing HEIC Converter app — this avoids needing codec support entirely and gives you universally compatible JPEG files.

Windows 10 does not include HEIC support by default because the HEVC video codec (used para HEIC compressão) requires a licensed patent. You can add HEIC support para grátis by installing the "HEIF Image Extensions" de the Microsoft Store (search para it, it's grátis). no Windows 11, basic HEIC viewing is built in. Alternatively, converter your HEIC arquivos to JPEG usando an online converter ou the grátis iMazing HEIC Converter app — this avoids needing codec support entirely e gives you universally compatível JPEG files.

Windows 10 does not include HEIC support by default because the HEVC video Codec (used für HEIC Komprimierung) requires a licensed patent. You can add HEIC support für kostenlos by installing the "HEIF Image Extensions" von the Microsoft Store (search für it, it's kostenlos). auf Windows 11, basic HEIC viewing is built in. Alternatively, umwandeln your HEIC Dateien to JPEG using an online converter oder the kostenlos iMazing HEIC Converter app — this avoids needing Codec support entirely und gives you universellly kompatibel JPEG files.

Windows 10 does not include HEIC support by default because the HEVC video codec (used para HEIC compresión) requires a licensed patent. You can add HEIC support para gratis by installing the "HEIF Image Extensions" de the Microsoft Store (search para it, it's gratis). en Windows 11, basic HEIC viewing is built in. Alternatively, convertir your HEIC archivos to JPEG using an online converter o the gratis iMazing HEIC Converter app — this avoids needing codec support entirely y gives you universally compatible JPEG files.

Use <strong>lossy</strong> (JPG, WebP, AVIF) for photographs — the human eye barely notices the difference at quality 80–85, and file sizes are 5–20× smaller. Use <strong>lossless</strong> (PNG, WebP-lossless) for screenshots, UI mockups, logos and anything with sharp edges or text — lossy creates ugly artifacts around boundaries.

HEIC can achieve equal or better visual quality at roughly half the file size compared to JPEG — or equivalently, much higher quality at the same file size. This advantage comes from HEVC's more efficient compression. Additionally, HEIC supports 10/12-bit color depth and HDR, which JPEG cannot do. For photos taken in good lighting, the quality difference may not be perceptible, but for high-dynamic-range scenes or photos that need fine editing (shadows, highlights), HEIC's 10-bit depth preserves more information. The main downside is compatibility — JPEG is universally supported while HEIC requires modern software.

For new projects in 2026, WebP is supported by all modern browsers (95%+ of traffic) and saves 25–35% over JPG at the same visual quality. AVIF is even more efficient (40–50% smaller) but encoding is slower and Safari support is recent. Use WebP as the default and AVIF as the progressive enhancement via <code><picture></code> with JPG fallback.

On macOS, you have several options: (1) Quick method: open the HEIC file in Preview, then File → Export and choose JPEG format. (2) Terminal/command line: use the built-in sips tool with the command: sips -s format jpeg photo.heic --out photo.jpg (3) Photos app: select photos, File → Export → Export Photos, choose JPEG format — works for multiple photos at once. (4) Automator workflow: create a batch converter using the "Change Type of Images" action. All these methods preserve the image quality and automatically handle color profile conversion.

On macOS, you have several options: (1) Quick method: abrir the HEIC arquivo in Preview, then arquivo → Export e choose JPEG formato. (2) Terminal/command line: usar the built-in sips tool com the command: sips -s formato jpeg photo.heic --out photo.jpg (3) Photos app: select photos, arquivo → Export → Export Photos, choose JPEG formato — funciona para multiple photos at once. (4) Automator workflow: create a batch converter usando the "Change Type of Images" action. All these methods preserve the qualidade da imagem e automatically handle color profile conversion.

On macOS, you have several options: (1) Quick method: öffnen the HEIC Datei in Preview, then Datei → Export und choose JPEG Format. (2) Terminal/command line: verwenden the built-in sips tool mit the command: sips -s Format jpeg photo.heic --out photo.jpg (3) Photos app: select photos, Datei → Export → Export Photos, choose JPEG Format — works für multiple photos at once. (4) Automator workflow: create a batch converter using the "Change Type von Images" action. All these methods preserve the Bildqualität und automatically handle color profile conversion.

On macOS, you have several options: (1) Quick method: abrir the HEIC archivo in Preview, then archivo → Export y choose JPEG formato. (2) Terminal/command line: usar the built-in sips tool con the command: sips -s formato jpeg photo.heic --out photo.jpg (3) Photos app: select photos, archivo → Export → Export Photos, choose JPEG formato — works para multiple photos at once. (4) Automator workflow: create a batch converter using the "Change Type de Images" action. All these methods preserve the calidad de imagen y automatically handle color profile conversion.

It depends on the tool: ImageMagick and FFmpeg copy EXIF by default, while cwebp drops it unless you pass <code>-metadata all</code>. KaijuConverter strips metadata server-side after conversion to protect your privacy — if you need to keep camera or GPS data, use a desktop tool you control.

HEIF (High Efficiency Image File Format) is the container format standard — it defines the file structure. HEIC is a specific variant of HEIF that mandates HEVC (H.265) as the compression codec. Think of HEIF as the box and HEIC as the specific type of box for HEVC-encoded images. Apple uses .heic for photos taken with iPhones. The broader HEIF standard also allows other codecs: AVIF uses the AV1 codec in the HEIF container, and future variants could use other codecs. In practice, "HEIF" and "HEIC" are often used interchangeably in consumer contexts, but technically HEIC is the Apple/HEVC-specific implementation.

HEIF (High Efficiency Image formatoo de arquivo) is the container formato padrão — it defines o arquivo structure. HEIC is a specific variant of HEIF that mandates HEVC (H.265) como o compressão codec. Think of HEIF como o box e HEIC como o specific type of box para HEVC-encoded images. Apple uses .heic para photos taken com iPhones. The broader HEIF padrão also permite other codecs: AVIF uses the AV1 codec no HEIF container, e future variants could usar other codecs. In practice, "HEIF" e "HEIC" are often used interchangeably in consumer contexts, mas technically HEIC is the Apple/HEVC-specific implementation.

HEIF (High Efficiency Image Dateiformat) is the Container Format Standard — it defines die Datei structure. HEIC is a specific variant von HEIF that mandates HEVC (H.265) als das Komprimierung Codec. Think von HEIF als das box und HEIC als das specific type von box für HEVC-encoded images. Apple uses .heic für photos taken mit iPhones. The broader HEIF Standard also erlaubt other Codecs: AVIF uses the AV1 Codec im HEIF Container, und future variants could verwenden other Codecs. In practice, "HEIF" und "HEIC" are often used interchangeably in consumer contexts, aber technically HEIC is the Apple/HEVC-specific implementation.

HEIF (High Efficiency Image formatoo de archivo) is the contenedor formato estándar — it defines el archivo structure. HEIC is a specific variant de HEIF that mandates HEVC (H.265) como el compresión codec. Think de HEIF como el box y HEIC como el specific type de box para HEVC-encoded images. Apple uses .heic para photos taken con iPhones. The broader HEIF estándar also permite other codecs: AVIF uses the AV1 codec en el HEIF contenedor, y future variants could usar other codecs. In practice, "HEIF" y "HEIC" are often used interchangeably in consumer contexts, pero technically HEIC is the Apple/HEVC-specific implementation.

Three common causes: (1) ICC color profiles dropped during conversion shift colors slightly; (2) chroma subsampling (4:2:0) reduces color accuracy in lossy JPG/WebP; (3) the new format may not support all features of the original (e.g. PNG → JPG drops transparency to white). For pixel-perfect results stick to lossless formats and preserve color profiles explicitly.