iPhone HEIC Photos: How LinkySend Converts Them Automatically

Why Won't My iPhone Photo Open?

HEIC (High Efficiency Image Container) is the default photo format on all iPhones since iOS 11 (2017). Apple adopted it because it offers much better compression than JPEG (typically 40 to 50% smaller files) while maintaining the same visual quality — your photos take far less space on your iPhone. The problem? HEIC is a proprietary format based on the HEVC (H.265) codec. Most web browsers, social networks, and third-party apps can't read it natively. Instagram rejects HEIC files with a cryptic error message. TikTok won't display them at all. Facebook converts them server-side, but with uncontrolled quality loss. When you export photos from iPhone to a Windows PC or web browser, they often arrive with a .heic or .heif extension, and no standard tool can process them. When does this happen in LinkySend? If you import a photo directly from your iOS gallery via Safari or Chrome mobile, and your iPhone is set to store photos in "High Efficiency" mode (the default setting), the uploaded file may be in HEIC format. LinkySend detects this format and handles it automatically.

1. 1On your iPhone, go to Settings > Camera > Formats.
2. 2If "High Efficiency" is selected, your photos are stored as HEIC.
3. 3The "Most Compatible" option forces native JPEG — but uses noticeably more storage space.
4. 4With LinkySend, you don't need to change this setting: conversion is automatic.

How LinkySend Automatically Converts Your HEIC Files

LinkySend includes a fully local HEIC conversion engine based on WebAssembly (WASM) technology. Here's exactly what happens when you import a HEIC photo into LinkySend.

1. 1You select your iPhone photo (HEIC format) in the LinkySend publishing interface.
2. 2LinkySend automatically detects the image/heic MIME type or .heic/.heif file extension.
3. 3The libheif WebAssembly engine is loaded directly in your browser (client-side).
4. 4HEIC → JPEG conversion happens entirely in your browser — no data is sent to our servers.
5. 5The resulting JPEG file (95% quality) is used for the preview and publishing.
6. 6You see no error messages, no noticeable delay — conversion is completely transparent.
7. 7The photo is then uploaded to selected social networks in standard JPEG format.

Are Your Photos Secure? Local Conversion Explained

This is the most important question, and the answer is simple: your photos never leave your device for conversion. LinkySend uses WebAssembly (WASM), a technology that allows running high-performance native code directly in your browser, without going through a server. In practice, this means: — No upload to a third-party conversion server (unlike many online "HEIC converter" services that store your photos) — Conversion happens in your browser's secure context, with the same isolation guarantees as any web page — Once conversion is complete, the memory used is freed — LinkySend only has access to the final JPEG file — your original HEIC stays exclusively on your device This "privacy-first" approach isn't just ethical — it's also faster. A local WASM conversion on a recent iPhone takes under 500ms, versus 2-5 seconds for a server round-trip.

Conversion Quality: What You Need to Know

LinkySend's HEIC to JPEG conversion preserves your photo quality to the maximum technically possible within JPEG constraints. Conversion parameters used by LinkySend: — JPEG quality: 95% (the recommended maximum before file size explodes) — Color profile: sRGB (universally compatible with all networks) — EXIF metadata: preserved (date, device, geolocation if present) — EXIF rotation: automatically applied (photos won't appear rotated incorrectly) — Transparency: HEIC photos with alpha channel are converted with white background File size comparison: A typical 12-megapixel HEIC photo (iPhone 15 Pro) is about 2-3 MB. Converted to 95% JPEG by LinkySend, it will be 3-5 MB. This is slightly larger than the original HEIC (normal — HEIC is more efficient), but well within the limits of all social networks (Instagram accepts up to 30 MB, TikTok up to 287 MB). The visual quality of the 95% JPEG is visually indistinguishable from the original HEIC. Your followers will see no difference.