PixHeic
Convert HEIC for Email Marketing Templates
Your ESP will not accept a .heic upload. But before you reach for WebP, there is a compatibility catch worth knowing about email specifically.
100% Local — Files Never Leave Your Browser
Convert HEIC to WebP now
Drop your .heic files into the converter and download WebP versions at the original resolution. Decoding runs on your device via WebAssembly, so the photos are never uploaded to a server.
Open the converter Free, no sign-up, no watermark. Conversion happens on your device.Zero uploads
The decoder runs in your browser via WebAssembly. Your files never touch a server, so there is nothing to retain, leak or subpoena.
Client compatibility first
Email rendering is decided by dozens of clients, several of which still do not read WebP.
Light enough to send
Image weight affects load time in the inbox and clipping in Gmail.
Why HEIC never works in email
ESPs such as Mailchimp and Klaviyo validate uploads against a short list of formats, and HEIC is not on it. Even if you host the image elsewhere and link to it, no major email client can render HEIC, so subscribers would see a broken image.
That much is simple. The interesting question is what you convert to.
WebP in email: the honest answer
Support is genuinely mixed. Apple Mail and most webmail render WebP fine, but several desktop clients — Outlook on Windows in particular, which renders through Word — do not reliably. A broken hero image in Outlook can cost more than the bytes you saved.
For campaign imagery, JPEG remains the safer default, with WebP reserved for audiences you know are on modern clients. Our HEIC to JPG converter is the right tool for most newsletters.
Test before you send
If you do use WebP in a campaign, run it through your ESP's inbox preview across Outlook, Gmail and Apple Mail first. An image that silently fails to render is worse than a slightly larger JPEG.
Frequently asked questions
Can I use WebP in email campaigns?
Cautiously. Apple Mail and most webmail clients handle WebP, but Outlook on Windows and some desktop clients do not render it reliably, and there is no automatic fallback inside an email. For broad consumer lists, JPEG is the safer choice.
Why won't my ESP accept a HEIC file?
Mailchimp, Klaviyo and similar platforms accept a fixed list of image types that does not include HEIC, and no email client can display it anyway. Converting before upload is the only route.
Is anything uploaded to a server?
No. PixHeic decodes your file with a WebAssembly build of libheif that runs inside your own browser tab, so the image is read from your device into memory and converted there. You can confirm it in your browser's Network tab, or disconnect from the internet after the page loads and convert anyway.