Quick answer
Most email clients reject HEIC attachments. Convert HEIC to JPG before emailing. Use the HEIC to JPG Converter Chrome extension (30 seconds), then attach the JPG file.
You attach a HEIC photo to an email and hit send. The recipient gets a corrupted file or no file at all. Email servers do not recognize HEIC as a valid image format. Converting to JPG is the only reliable fix.
heicconvert.site · HEIC to JPG Converter
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HEIC
IMG_4827.HEIC
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HEIC
IMG_4828.HEIC
Done . 1.1s
HEIC
IMG_4829.HEIC
82%
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Why email clients reject HEIC
Three reasons:
- Older email servers: Many email systems (especially corporate) do not recognize HEIC MIME type (image/heic). They reject the attachment as unknown format.
- Mobile email: Gmail, Outlook, Apple Mail on Android cannot display HEIC without downloading a separate codec.
- Windows users: Cannot open the attachment even if email accepts it.
JPG works everywhere. HEIC fails in 40-50% of cases.
Before emailing: convert in 30 seconds
- Use HEIC to JPG Converter (Chrome extension), or Cloudconvert (web).
- Drag HEIC file into the tool.
- Click Convert/Download.
- Attach the JPG to your email instead.
Takes less time than writing the email subject line.
Email client behavior with HEIC
- Gmail: Accepts HEIC, displays preview on iOS (works if recipient uses Apple). On Android/Windows: shows error.
- Outlook (web): Rejects HEIC attachment, shows error: "This file type is not supported".
- Outlook (desktop on Windows): Accepts HEIC but recipient sees corrupted thumbnail.
- Apple Mail (Mac/iOS): Full support, shows preview, can forward without issue.
- Yahoo Mail: Rejects with error.
Only Apple Mail reliably handles HEIC. Convert for everyone else.
Alternative: use cloud sharing instead
If emailing photos:
- Send a Google Drive or OneDrive link instead of attachment (they auto-convert preview to JPG).
- Upload HEIC to Google Photos, share album link (works on all devices).
- Airdrop on Apple devices (preserves HEIC, no conversion).
These avoid the email attachment problem entirely.
At-a-glance comparison
| Email client | Accepts HEIC | Recipient can view | Recommendation |
|---|---|---|---|
| Gmail | Yes | iOS only | Convert to JPG |
| Outlook web | No (rejects) | N/A | Convert to JPG |
| Outlook desktop (Windows) | Yes | No (corrupted) | Convert to JPG |
| Apple Mail | Yes | Yes (Apple) | OK to send |
| Yahoo Mail | No (rejects) | N/A | Convert to JPG |
Frequently asked questions
Will Gmail accept HEIC if I compress it first?
No. Gmail accepts HEIC but still has display issues on non-Apple devices. Compress as JPG instead.
Can I send HEIC to another iPhone user safely?
Yes, HEIC to HEIC works fine. But if they forward it to a Windows user, it breaks. Convert preventatively.
What if I zip the HEIC file?
The recipient would need to unzip, then still cannot open HEIC on Windows. Convert to JPG instead.
Is there a browser extension to auto-convert on email?
No. You must convert manually. Takes 30 seconds with HEIC to JPG Converter.
Can I set my iPhone to email photos as JPG instead of HEIC?
No, iPhone always exports as HEIC by default. You must convert before emailing, or use AirDrop.
