Decide whether conversion is needed
HEIC is a file extension used for HEIF images. Compatible Apple systems support the format, but that does not mean every website, application or recipient can read it. Check the accepted formats at your destination before converting an entire collection. Keep the original format when there is no reason to change it.
The main purpose here is compatibility. A JPEG copy can be larger than the original HEIC, so changing format and reducing file size are separate tasks. Simply renaming a .heic extension to .jpg does not convert the image data and will not solve an unsupported-format problem.
Prepare JPEG copies in PhotoWisp
Work with files already available on your Mac. PhotoWisp accepts JPEG, PNG and HEIC input, with up to 500 photos per batch. Review your selection before starting so the batch contains only the images you intend to share.
- Drop HEIC files into the window or use Choose photos…
- Select Change format to prepare JPEG copies.
- Open Advanced options and choose a dimension limit only if your destination needs one. Small images are never enlarged.
- Run the conversion, then use Preview and Compare to inspect the results.
- Check the folder shown under Save to and use Save copies.
Check the image as well as its extension
Look closely at faces, colour and fine details in important photos. Creating a JPEG can lose detail. Keep the original HEIC if you want a good source for a different output later. A new file extension does not guarantee that every aspect of the original will look identical.
JPEG cannot retain transparency. If a cutout needs a transparent background, use PNG in Remove background. An explicitly applied transparent cutout remains PNG even when Change format is selected, so check the actual output format shown for each copy. A white background is suitable when you deliberately want an opaque JPEG.
Address a separate size limit
When the receiving service also sets a maximum file size, use Reduce file size with that stated limit. Inspect the result again because a smaller target can affect detail. An especially low size target is not inherently useful when your only problem is format compatibility.
Saving creates copies and leaves originals available. PhotoWisp works on macOS 14 or later on Intel and Apple Silicon Macs. Photo processing happens locally without uploading images to a server. The destination may still enforce its own requirements for dimensions, content or attachment size, so test the prepared JPEG before sending the complete collection.
Common questions
Will JPEG always be smaller than HEIC?
No. JPEG conversion is useful for compatibility and may increase file size. Use file size reduction when you need a specific target.
Can JPEG keep a transparent background?
No. Use PNG to retain cutout transparency. JPEG needs an opaque background.