A photo that opens on your iPhone may fail on Windows or in an attachment form. Check the source, then test one JPG copy at the actual destination.
Before converting the whole batch, review orientation, color and file size to avoid repeating the job. Keep the HEIC source.
Start with the symptom you see
The next step depends on whether only Windows fails or the source itself will not open. Find your symptom below, then follow the details that follow.
| Symptom | Check first | Next action |
|---|---|---|
| Opens on iPhone but not Windows | HEIC support in the Windows photo app or viewer | Use a compatible viewer, or make and test one JPG copy. |
| Will not open on iPhone either, or the file is 0KB | Whether the source finished downloading or transferring, and its file state | Download or transfer the source again. Converting a 0KB file cannot recover the photo. |
| The JPG opens but the submission form rejects it | Accepted format, bytes, pixel dimensions, aspect ratio and filename | Save a copy to the destination’s specifications. A JPG extension alone does not ensure acceptance. |
| JPG brightness or colors differ from the source | Possible differences in HDR, color processing or viewer rendering | Compare both in the same app on the same screen. If the difference is substantial, check another conversion or viewing environment. |
Check the source on the iPhone first
If the source also fails on the phone or measures 0KB, investigate an incomplete transfer or damaged file first. If it works there but not on Windows, prepare a compatible copy and retain the HEIC.
Convert one photo before the batch
Open one source in the HEIC converter and choose JPG. Start with the default quality for sharing; keep original dimensions initially for small document text or printing.
Follow an explicit PNG requirement. Saving a full camera photo as PNG merely because it sounds sharper can greatly increase its size.
Open the downloaded copy on Windows and at the destination
Inspect orientation, brightness and color in Photos or a browser. Check extension and bytes in File Explorer and compare dimensions with the submission rules. Process the remaining photos after this copy works where it is needed.
If it still fails, separate viewing from submission
If the JPG opens on Windows but is rejected by the portal, review accepted formats, bytes, aspect ratio and naming rules. Try a different known-good photo if the source also fails, to separate a file problem from an app problem.
- Read related articleChoose between future JPG capture and keeping HEIC