Some email services and webmail interfaces handle HEIC attachments inconsistently — refusing the upload outright, displaying a broken preview, or sending it in a way that leaves the recipient unable to open it properly. Converting to JPG first generally sidesteps this entirely.
Why HEIC specifically causes this kind of trouble
Email services vary considerably in how well they support newer formats like HEIC, and even when a service technically accepts the upload, the recipient's own email client might not render or open it correctly, since HEIC support is less universal than older, more established formats.
Steps to fix it
- Open HEIC to JPG.
- Upload the photo that's causing trouble.
- Convert to JPG for maximum compatibility.
- Attach the converted JPG to your email instead of the original HEIC file.
Why JPG specifically solves this reliably
JPG is about as close to a universal standard as image formats get, supported by essentially every email service and client in common use. Converting before attaching removes the uncertainty around whether a specific recipient's email setup will actually handle HEIC correctly.
Converting multiple photos before a single email send
If you're attaching several HEIC photos to the same email, convert the whole set to JPG first rather than attaching a mix of formats, keeping the email's attachments consistent and avoiding a situation where some photos display correctly for the recipient and others don't.
Checking your email service's attachment size limit too
Converting to JPG also tends to reduce file size compared to the original HEIC, which can help if you're also running into a separate attachment size limit, following the general approach covered in our guide on compressing an attachment that keeps bouncing back from an email server.
Setting your phone to save photos as JPG by default
If this is a recurring issue, checking your phone's camera settings for an option to save photos in a more universally compatible format by default can reduce how often you need to convert files after the fact, though this is a personal trade-off against the storage savings HEIC otherwise offers.
Checking whether the issue is actually about the attachment, not the format
Before assuming format is the cause, rule out other common attachment issues — file size, a slow connection, a temporary service outage — since these can sometimes produce a similar-looking failure that format conversion alone won't actually fix.
What to do if the recipient's side is the actual problem
If your email sends successfully but the recipient reports trouble opening the attachment, the issue may be on their end rather than yours; converting to JPG before sending is still the most reliable preventive step regardless of exactly where the original mismatch occurred.
A reasonable default habit if this issue has come up more than once
If you've hit this specific problem more than once, it's worth simply adopting "convert to JPG before attaching" as a default habit for any photo you're sending by email, rather than only converting reactively each time an attachment actually fails.
Why this is worth fixing properly rather than working around it once
A one-off workaround, like asking the sender to resend a photo in a different way, solves the immediate problem but leaves the underlying mismatch to cause the same friction again next time. Converting to JPG yourself, as a repeatable habit, is a more durable fix than relying on someone else to change how they send things.
Considering whether your email client has settings worth checking too
Beyond the file format itself, some email clients have their own settings around automatic image compression or format handling for outgoing attachments, which occasionally interact with HEIC files in unexpected ways; it's worth a quick check of your specific client's settings if conversion alone doesn't fully resolve the issue.
Why this small fix is worth remembering for the future
Once you've solved this specific problem once, remembering the fix saves you from having to search for or rediscover the same solution the next time a similar HEIC attachment issue inevitably comes up again.
Frequently asked questions
Why does my HEIC photo cause trouble attaching to an email?
Email services and clients vary in how well they support HEIC, sometimes rejecting the upload or failing to display it correctly for the recipient.
What's the quickest fix?
Convert the photo to JPG before attaching it, which is supported essentially universally across email services and clients.
Should I convert all my photos if attaching several at once?
Yes, convert the whole set to JPG for consistency, rather than attaching a mix of formats.
Does converting also help with attachment size limits?
Often yes, since JPG files are typically smaller than the original HEIC, which can help if size is also a factor.
Can I set my phone to avoid saving photos as HEIC in the first place?
Most phones offer a camera setting for this, though it trades away some of HEIC's storage-saving benefit.
Will the recipient notice a quality difference from the conversion?
Generally no, the tool uses high quality settings, so the difference isn't visible for most photos.
Is HEIC to JPG free to use?
Yes. No sign-up, no watermark, and files are removed from the server automatically about an hour after processing.