Photo contests almost always ask for JPG entries, and iPhones save photos as HEIC by default. That mismatch has ruined more than one entry: a photographer picks their best shot, attaches it to the entry form, and gets a vague error about an unsupported file type. The photo was never the problem. The format was.
Why contest forms refuse HEIC
Contest entry forms are built for the widest possible compatibility. Judges may open entries on different devices and software, and the organisers need every entry to display identically for everyone. JPG is the format every system reads without extra software. HEIC is Apple's format, designed to save space on the phone, but many web forms, judging platforms, and older image tools cannot open it at all. When the rules say JPG only, they mean the file itself must be JPG data — a HEIC file with a different name does not qualify.
Keep the original before you convert
Start by protecting the original. Keep the HEIC master exactly as it came off the phone, and convert a copy for the entry. If the contest later asks for a different size, a different crop, or a higher-quality version, you want to work from the original, not from a file that has already been converted once.
Do not just rename the file extension
Renaming a file from .heic to .jpg changes only the label, not the contents. The file is still HEIC data, and the entry form will still reject it — or, in the worst case, accept it and then fail to display it to the judges. A real conversion decodes the HEIC image and writes a genuine JPG file. Check the result opens as a JPG before you send it anywhere.
Convert in the browser, without uploading
You do not need to install a converter app, and you should think twice before uploading an unpublished contest entry to a random conversion server. A browser-based converter that processes files locally keeps the work on your own device:
- Pick the entry photo and decide on any final crop or straightening first, while you still have the original.
- Open the converter in your browser and select the HEIC copy you prepared.
- Convert to JPG and download the result.
- Open the downloaded JPG and confirm the framing and orientation are right before attaching it to the entry form.
One caution applies to any online converter: most of them upload your photo to their server first, convert it there, and send the result back. For a contest entry you have not published yet, that is an unnecessary exposure. You can convert HEIC to JPG for photo contest entries entirely in the browser: the conversion runs on your own device, nothing is uploaded to a conversion server, and no account is needed.
Pre-submit checklist
Run through this list before you finalise the entry:
- Open the JPG on a different device or in a different app from the one you converted in. If it opens cleanly there, the file is genuinely a JPG.
- Confirm the photo is the right way up and not mirrored or rotated. Orientation errors are easy to miss on a small phone preview.
- Re-read the contest rules and confirm your file matches the stated format and size requirements.
- Check that the entry form's preview shows the photo you intended, not an older or duplicate file with a similar name.
- Keep the original HEIC master archived until the contest results are announced, in case the organisers request a replacement file.
Contests are judged on the photograph, not the file format — but only if the judges can open it. Convert a copy to a genuine JPG and verify it opens elsewhere.
Disclosure: I'm the developer of FileOnTap.
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