HEIC and JPG both store photos, but they target different priorities — storage efficiency vs universal compatibility. This comparison helps you choose when to shoot HEIC on iPhone, when to export JPG, and how conversion fits sharing workflows.
重要なポイント
- HEIC typically yields smaller files than JPG at similar perceived quality on Apple devices.
- JPG is the lingua franca for web uploads, Windows, and legacy apps.
- Convert HEIC to JPG when recipients or platforms cannot open Apple formats.
- Keep HEIC masters on device; distribute JPG copies for clients and CMS.
- HDR and Live Photos nuances may be lost or flattened on conversion — plan accordingly.
Technical differences
HEIC uses HEVC-based compression; JPG uses DCT-based lossy compression from the 1990s. HEIC supports transparency and multiple images in one container (bursts, Live Photos).
JPG is universally implemented in browsers, printers, and embeddable widgets. HEIC support grew on Windows 10+ with optional codecs but remains inconsistent on the web.
When HEIC is the better choice
iPhone storage constraints, personal libraries in Apple Photos, and workflows staying inside iCloud benefit from HEIC efficiency.
If you never leave the Apple ecosystem for editing and sharing, HEIC minimizes backup sizes.
When JPG is the better choice
Client deliverables, WordPress featured images, email attachments to corporate inboxes, and cross-platform teams should standardize on JPG (or PNG for graphics).
Embedded systems, kiosks, and older DAM software often whitelist JPG/PNG only.
Using conversion as a bridge
Shoot HEIC for density, batch convert to JPG before publication using HEIC to JPG. Pair with WebP Converter for modern web delivery after JPG masters exist.
Document your studio's export preset (quality 85, sRGB, max width 2400px) so freelancers return consistent assets.
Quality perception and file size
At equal file size, HEIC often looks sharper on foliage and gradients. At equal visual quality, HEIC files run smaller — until you convert, at which point JPG size depends on chosen quality slider.
Do not convert HEIC → JPG → HEIC; each lossy step compounds artifacts.
よくある質問
Is HEIC higher quality than JPG?
Often better bits-to-quality ratio, not inherently higher resolution. Compare at matched file sizes or quality settings.
Do websites accept HEIC uploads?
Most do not. Convert to JPG or WebP before CMS upload.
How do I make iPhone shoot JPG instead?
Settings → Camera → Formats → Most Compatible.
Does converting HEIC to JPG remove Live Photo motion?
Yes — you keep a still frame only. Export motion separately if needed.
Which format for SEO image assets?
Publish JPG or WebP on pages; avoid HEIC in public URLs.
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