When conversion is useful
Some iPhone photos use HEIF, commonly saved with the .heic extension. A site can reject that file even though it opens normally on your phone. A JPG copy is useful when the receiving service specifically accepts JPEG but does not list HEIC.
Apple documents both exporting existing images into other formats and changing Camera > Formats to Most Compatible for future captures on supported devices. Changing a camera setting does not retroactively convert your photo library. You do not need to change the camera setting to use this converter.
Prepare a copy in PixelPrep Tools
- Open HEIC to JPG and tap anywhere inside the photo box. Choose the photo or file. The picker may supply a converted copy itself, so check the file information shown after selection.
- Wait for the thumbnail to appear. HEIC decoding can take longer than opening JPG, especially on a phone. Keep this tab in the foreground.
- Leave the custom fit on Keep original dimensions for a format-only conversion. Keep Output dimensions and Zoom at 100% unless you deliberately want a smaller result.
- Prepare the photo, compare the output with the original preview, and download it. Confirm the result is a JPG and open it from your device’s downloads.
If the photo will not open
The input limit is 40 MB and 40 megapixels per image. A 48-megapixel camera original exceeds the pixel limit even if its file size is below 40 MB. Use a smaller exported copy from a trusted photo application; do not just rename the file extension.
A .heic or .heif extension is not proof that every encoding variant can be decoded. Corrupt files, unusual variants and device memory limits can prevent opening. Try one image at a time and close other memory-heavy tabs. If the file is still rejected, export a JPEG with the device’s photo software and add that copy.
PixelPrep Tools does not process your photos on a remote conversion server. That keeps the conversion local, but it also means your browser and device determine available memory. Support can investigate the error with your device, browser and file dimensions; do not email a private photo.
A JPG is not the entire camera original
The result is a re-encoded still picture. Do not rely on it to preserve Live Photo motion, depth information, a multi-image sequence, or original camera metadata. Colour and tonal appearance can differ between the source viewer and browser output, so inspect skin tones, skies and very bright areas.
For a format-only conversion, dimensions should stay the same within the output limit of 8192 pixels per side and 24 megapixels total. If your original exceeds that output limit, deliberately reduce Output dimensions before preparing. Keep the original for editing or archiving.