What is the difference between JPG and JPEG?

There is no technical difference. JPEG is the format name; JPG is a shortened 3-letter extension from early Windows. Both extensions refer to identical files using the same JPEG compression standard.

More about converting HEIC to JPEG

JPG and JPEG are the same format - There is no technical difference whatsoever. JPEG (Joint Photographic Experts Group) is the formal name of the format. The .jpg extension exists because early Windows operating systems (MS-DOS, Windows 3.x) enforced a 3-character limit on file extensions, so .jpeg was shortened to .jpg. Modern operating systems use both interchangeably.

Converting HEIC to JPEG is therefore identical to converting HEIC to JPG: your iPhone photo is decoded and re-encoded as a universally compatible JPEG that opens on any device, in any email client, and in any image editor - No HEVC codec required. The only reason to specifically target the .jpeg spelling is that some legacy software, shell scripts, or automated workflows are hardcoded to accept only .jpeg files and reject .jpg.

When you'd use this

Reasons to convert HEIC to JPEG usually come down to compatibility, file-size, or specific feature requirements. Common situations:

  • An app or platform only accepts JPEG uploads.
  • You need a feature unique to JPEG (e.g. transparency, vector scaling, animation, multi-page pages, etc.) that HEIC doesn't provide.
  • You're optimising file size — modern formats often produce smaller files than the older format you started with.
  • You need a single archival format across a project so files behave consistently in the same viewer.

How to do it in heic.now

  1. Open the HEIC → JPEG tool on heic.now.
  2. Drag your HEIC file onto the drop zone, or click Select files. You can drop a whole folder of files at once.
  3. The output is fixed to JPEG. If the format supports extra options (page size, transparency background, quality, EXIF stripping), tweak them in the right-hand panel.
  4. Click Convert. The job runs on our server and finishes in a few seconds for typical photos.
  5. Download the result. Files stay in storage for 24 hours and are then permanently deleted.

The entire flow is free for the first 10 jobs per day with no signup required. A free account doubles that quota; a premium plan removes the limit entirely.

Tips and common pitfalls

  • If you already have a .jpg file and only need the .jpeg extension, rename it directly in Finder (Mac) or Windows Explorer - Right-click → Rename → change .jpg to .jpeg. No re-encoding is needed.
  • Use quality 85–92% for the conversion - The JPEG will be visually identical to the HEIC source at a modestly larger file size.
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