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.

Guide

HEIF Image Format: What It Is, How to Open & Convert HEIF Files

PC By Pablo Cirre • Updated May 7, 2026

HEIF (High Efficiency Image Format) Complete Guide

What Is HEIF?

HEIF (High Efficiency Image Format) is a modern image container format standardised by the Moving Picture Experts Group (MPEG) in 2015 under ISO/IEC 23008-12. It uses the HEVC (H.265) video codec for image compression, achieving roughly 40–50 % better quality-per-byte than JPEG at identical file sizes. Apple adopted HEIF as the default camera capture format on iPhone 7 and later (iOS 11+), bringing the format into mainstream use overnight.

The file extension is normally .heif or .heic (HEIC is the Apple-specific variant that mandates HEVC compression; HEIF is the broader container that may also use future codecs such as AV1/AVIF).

Container Architecture

HEIF builds on the ISO Base Media File Format (ISOBMFF) — the same foundation used by MP4 video. This design lets a single HEIF file hold:

One or more still images (e.g. burst shots, bracket exposures, HDR stacks)
Image sequences / animations (similar to animated GIF, but far smaller)
Depth maps and segmentation data (used in Portrait Mode bokeh, background-removal APIs)
Auxiliary images — thumbnail, alpha mask, gain map for HDR display
Full metadata — EXIF, XMP, ICC colour profiles

Compression Engine: HEVC (H.265)

HEIF still images are compressed by HEVC, which employs:

Recursive block partitioning — coding tree units (CTUs) up to 64 × 64 px, split into smaller prediction units (PUs) adapting to local image complexity
Spatial prediction — 33 angular intra-prediction directions plus DC and planar modes
Transform coding — integer DCT (4 × 4 to 32 × 32), separable butterfly implementation
Context-Adaptive Binary Arithmetic Coding (CABAC) — superior entropy compression vs. JPEG's Huffman coding
Deblocking and SAO filtering — post-processing removes block artefacts at high compression ratios

Quality is specified via a Quantisation Parameter (QP) from 0 (near-lossless) to 51 (maximum compression). In practice, QP 20–28 delivers visually transparent results for most content.

Colour Depth and Gamut

HEIF supports 8-bit, 10-bit, and 12-bit colour depth per channel. 10-bit encoding enables faithful reproduction of wide-gamut colour spaces:

Display P3 (DCI-P3) — default on recent iPhones and iPads; covers ~25 % more colours than sRGB
Rec. 2020 / BT.2020 — ultra-wide gamut for broadcast and cinema mastering
sRGB — standard for web and legacy displays

10-bit and 12-bit files look identical on sRGB displays but retain colour headroom for future wide-gamut screens and editing.

HDR Support

HEIF natively encodes High Dynamic Range imagery using two industry-standard transfer functions:

Perceptual Quantizer (PQ / SMPTE ST 2084) — absolute luminance up to 10 000 nits; used in Dolby Vision and HDR10
Hybrid Log-Gamma (HLG / ARIB STD-B67) — backward-compatible with SDR displays; used in broadcast HDR

An HDR HEIF stores a gain map alongside the standard SDR rendition, allowing legacy devices to display the SDR version while HDR-capable screens reconstruct the full dynamic range — all within the same file.

Alpha Channel (Transparency)

HEIF supports an 8-bit (and optionally 16-bit) alpha channel compressed independently via HEVC. Unlike PNG's alpha (stored as raw or DEFLATE-compressed data), HEIF alpha leverages HEVC prediction, reducing alpha overhead to near-zero for simple masks and achieving significant savings on complex transparency.

Metadata and Auxiliary Images

Every HEIF file can embed:

EXIF — camera make/model, focal length, shutter speed, GPS coordinates
XMP — extensible metadata for keywords, copyright, creative ratings, colour labels
ICC profile — precise colour-space definition ensuring consistent rendering across devices
Thumbnail — embedded low-resolution preview for fast gallery loading
Depth map — 16-bit grayscale depth data from stereo cameras or LiDAR; used by iOS for Portrait Mode effects and computational photography APIs

Advantages

Feature	HEIF	JPEG
Compression efficiency	~50 % smaller at same quality	Baseline
Bit depth	8 / 10 / 12-bit	8-bit only
Wide colour gamut	P3 / Rec. 2020 native	sRGB only
HDR	Yes (PQ + HLG + gain map)	No
Alpha transparency	Yes	No
Animation	Yes	No
Multiple images in one file	Yes	No
Depth / auxiliary data	Yes	No

Disadvantages and Compatibility Gaps

Despite its technical superiority, HEIF faces real-world hurdles:

Patent licensing — HEVC is encumbered by two competing patent pools (MPEG LA and HEVC Advance); this deterred broad adoption on non-Apple platforms for years
Web browser support — Chrome and Firefox still lack native HEIF/HEIC decoding (as of 2025); Safari has full support
Windows — requires the HEIF Image Extensions codec (free in Microsoft Store) or Windows 11 built-in support on newer builds
Android — Google Photos accepts HEIF upload but native Android gallery support varies by OEM and Android version
Encoding speed — HEVC encoding is 5–10× slower than JPEG for equivalent quality; real-time encoding requires hardware acceleration

Platform Support Matrix (2025)

Platform	Status
iOS 11+ / iPadOS	Full — default camera format
macOS 10.13+	Full — Preview, Photos, Finder thumbnail
Windows 11 (recent builds)	Native; older builds need HEIF Extension
Android	Partial — varies by OEM
Chrome / Firefox	No native HEIC; AVIF (HEIF + AV1) supported
Safari 13+	Full
Adobe Lightroom / Photoshop 2021+	Full
Capture One 21+	Full
DaVinci Resolve 17+	Full

File Size in Practice

A 12 MP iPhone photo (4032 × 3024 px):

HEIF (default iPhone) — 1.5–3 MB
JPEG (same scene) — 3–6 MB
PNG (lossless) — 18–25 MB

Switching an iPhone photo library from JPEG to HEIF reduces iCloud storage consumption by 40–50 % — a meaningful saving for users near storage limits.

When to Use HEIF

Use HEIF when:

Shooting on iPhone / iPad and archiving locally or in iCloud
Working in a macOS or iOS-only ecosystem
Needing HDR, wide-gamut, or depth-map data alongside the image
Archiving large image libraries where storage savings are critical

Convert to JPEG or WebP when:

Sharing on the web or social media
Sending to Android users or Windows users without HEIF codec
Uploading to platforms that only accept JPEG/PNG (many e-commerce sites, CMS platforms)
Processing in older software tools

Converting HEIF Files

Modern batch converters handle HEIF natively. Converting HEIF → JPEG with KaijuConverter preserves full visual quality while ensuring universal compatibility. HEIF → PNG conversion is ideal when alpha-channel data must be retained. HEIF → WebP delivers a good size/compatibility balance for modern web projects.

Related conversions

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Frequently Asked Questions

HEIF is the container format standard; HEIC is Apple's specific profile of HEIF that mandates HEVC compression. All HEIC files are HEIF files, but not all HEIF files are HEIC. Apple uses the .heic extension by default on iPhone and iPad.

HEIF is the container formato padrão; HEIC is Apple's specific profile of HEIF that mandates HEVC compressão. All HEIC arquivos são HEIF files, mas not all HEIF arquivos são HEIC. Apple uses the .heic extension by default no iPhone e iPad.

HEIF is the Container Format Standard; HEIC is Apple's specific profile von HEIF that mandates HEVC Komprimierung. All HEIC Dateien are HEIF files, aber not all HEIF Dateien are HEIC. Apple uses the .heic extension by default auf iPhone und iPad.

HEIF is the contenedor formato estándar; HEIC is Apple's specific profile de HEIF that mandates HEVC compresión. All HEIC archivos are HEIF files, pero not all HEIF archivos are HEIC. Apple uses the .heic extension by default en iPhone y iPad.

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.

On Windows 11 (recent builds from 2022 onward) HEIF support is built in. On Windows 10 you need the free "HEIF Image Extensions" package from the Microsoft Store. Without it, Photos and Explorer cannot display .heic or .heif files.

On Windows 11 (recent builds de 2022 onward) HEIF support is built in. no Windows 10 you need the grátis "HEIF Image Extensions" package de the Microsoft Store. sem it, Photos e Explorer cannot display .heic ou .heif files.

On Windows 11 (recent builds von 2022 onward) HEIF support is built in. auf Windows 10 you need the kostenlos "HEIF Image Extensions" package von the Microsoft Store. ohne it, Photos und Explorer cannot display .heic oder .heif files.

On Windows 11 (recent builds de 2022 onward) HEIF support is built in. en Windows 10 you need the gratis "HEIF Image Extensions" package de the Microsoft Store. sin it, Photos y Explorer cannot display .heic o .heif files.

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.

Yes — JPEG is also lossy, so converting HEIF → JPEG applies a second round of compression. At JPEG quality 90–95 the visible difference is negligible for screen viewing, but forensic pixel differences exist. For archival, keep the HEIF original and export JPEG only for sharing.

Yes — JPEG is also com perdas, so convertendo HEIF → JPEG applies a second round of compressão. At JPEG quality 90–95 the visible difference is negligible para screen viewing, mas forensic pixel differences exist. para archival, keep the HEIF original e export JPEG only para sharing.

Yes — JPEG is also verlustbehaftet, so umwandelnd HEIF → JPEG applies a second round von Komprimierung. At JPEG quality 90–95 the visible difference is negligible für screen viewing, aber forensic pixel differences exist. für archival, keep the HEIF original und export JPEG only für sharing.

Yes — JPEG is also con pérdidas, so convirtiendo HEIF → JPEG applies a second round de compresión. At JPEG quality 90–95 the visible difference is negligible para screen viewing, pero forensic pixel differences exist. para archival, keep the HEIF original y export JPEG only para sharing.

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.

Android's native gallery apps do not include HEIC decoders. Google Photos can display them after upload, but local file managers often cannot. The easiest fix is to convert HEIC to JPEG before sending, or use an app like "HEIC to JPEG" on Android.

Android's native gallery apps do not include HEIC decoders. Google Photos can display them depois upload, mas local arquivo managers often cannot. The easiest fix is to converter HEIC to JPEG antes sending, ou usar an app like "HEIC to JPEG" no Android.

Android's native gallery apps do not include HEIC decoders. Google Photos can display them nach upload, aber local Datei managers often cannot. The easiest fix is to umwandeln HEIC to JPEG vor sending, oder verwenden an app like "HEIC to JPEG" auf Android.

Android's native gallery apps do not include HEIC decoders. Google Photos can display them después upload, pero local archivo managers often cannot. The easiest fix is to convertir HEIC to JPEG antes sending, o usar an app like "HEIC to JPEG" en Android.

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.