JPEG, JPG: same format, two spellings
JPEG stands for Joint Photographic Experts Group, the committee that designed the format. The file itself is the same whether it’s called photo.jpeg or photo.jpg. The shorter spelling exists because early versions of Windows only allowed three-letter file extensions, and the habit stuck.
So if you searched for “HEIC to JPEG” and landed on a page that saves .jpg files, nothing is wrong. You’re getting a standard JPEG that any “JPEG only” system will accept.
Where you’ll see “JPEG” instead of “JPG”
The longer name tends to appear in official or technical places:
- Windows and macOS describe the file type as “JPEG image” in File Explorer and Finder, even when the name ends in .jpg.
- Upload forms for visas, job applications, schools and government portals often say “JPEG format only”.
- Cameras usually offer “JPEG” and “RAW” as quality settings.
- Web servers label the file
image/jpeg, whatever the extension.
All of them mean the same format you get from this converter.
What if a form rejects .jpg?
It’s rare, but some badly built forms check the extension literally. Rename the file from .jpg to .jpeg and try again. Renaming is safe here because the contents are already JPEG. (Renaming a .heic file to .jpeg is not safe: the file is still HEIC inside and will be rejected or show as broken.)
If the form complains about size rather than type, send your photos through Compress HEIC instead. It outputs JPEG at the quality needed to fit a limit such as 1 MB, using decimal megabytes so it passes either way the form counts.
How the conversion works
Your browser does all the work. A WebAssembly copy of libheif decodes the HEIC, and Web Workers encode JPEGs in parallel. No file is sent anywhere, there’s no account, and there’s no watermark stamped on the result. If you’re on a train with flaky signal, it keeps working because the app is cached after your first visit.
Colours are handled carefully too. iPhone photos are captured in Display P3, so we embed that profile in the JPEG. If an older program shows the colours a bit flat, switch Colour to sRGB.
Converting lots of photos
Drop a whole folder on desktop, or select hundreds of photos at once. You can pause, resume and retry any file that failed, then download one ZIP. For a full camera roll, the HEIC to JPG batch tool puts those controls front and centre.
Still on Windows and want to open HEIC files directly? Our page on converting HEIC for Windows covers the options.