Why HEIC causes problems
HEIC (High Efficiency Image Container) is Apple's format based on the HEVC codec. It produces files roughly 50% smaller than JPEG at equivalent quality — a significant advantage on phones with limited storage.
The problem: HEIC is not universally supported. Platforms that commonly reject or mishandle HEIC:
- Windows (without the HEVC codec extension installed)
- Many website upload fields and CMS platforms
- Most Android phones
- Email attachments opened in Outlook and Gmail on non-Apple devices
- Many social media platforms (they convert it server-side, but not always correctly)
- Design tools not updated to handle HEIC
Method 1: Convert in your browser (no download)
Use the free image converter — upload your HEIC file and select JPG as the output. No account, no app download, no file upload to external servers. Processing runs locally in your browser.
Note: HEIC support in browsers depends on your operating system. Chrome on Mac handles HEIC natively. Chrome on Windows may require the Microsoft HEVC extension (available free from the Microsoft Store) for browser-based conversion to work.
Method 2: Stop your iPhone saving as HEIC
The best long-term solution is to make your iPhone save in JPG from the start:
- Settings → Camera
- Formats
- Select Most Compatible (saves as JPEG and H.264)
This increases file size but eliminates the compatibility problem entirely. Future photos are saved as standard JPG.
Method 3: Transfer as JPG from iPhone
When transferring photos from iPhone to Windows via USB, you can configure automatic conversion:
- Settings → Photos
- Scroll to "Transfer to Mac or PC"
- Select Automatic — photos convert to JPG during transfer to Windows
Photos remain as HEIC on the iPhone (saving storage) but transfer as JPG to Windows.
Method 4: iCloud.com download
If your photos are in iCloud:
- Go to icloud.com/photos in a browser
- Select the photos
- Download — iCloud automatically converts HEIC to JPG for browser downloads
Quality loss when converting HEIC to JPG
HEIC is a more efficient codec than JPEG — at the same visual quality, HEIC is roughly 50% smaller. Converting to JPEG increases file size and, at low quality settings, introduces some compression artifacts.
At quality 85–90%, the JPG output is visually indistinguishable from the HEIC original for most photos. Use the quality slider in the image converter to balance file size and quality for your use case.
Summary
For one-off conversions: use the free image converter. For preventing the problem: switch iPhone Camera settings to "Most Compatible" or configure "Automatic" transfer conversion. For iCloud photos: download via icloud.com.