JPG vs JPEG
JPG and JPEG are not two different formats — they are identical. Both refer to images compressed with the JPEG standard from the Joint Photographic Experts Group. The only difference is the spelling of the file extension, a leftover from old operating-system limits.
There is no difference: .jpg and .jpeg are the same format and open identically everywhere. Use whichever extension you like — .jpg is more common, .jpeg is the original spelling. You never need to convert between them.
JPG vs JPEG: side-by-side comparison
| Attribute | JPG | JPEG |
|---|---|---|
| Format | JPEG standard | JPEG standard |
| Extension length | 3 letters (.jpg) | 4 letters (.jpeg) |
| Why it exists | Old DOS/Windows 8.3 filename limit | Original full extension |
| Quality / compression | Identical | Identical |
| Compatibility | Universal | Universal |
| Conversion needed | No | No |
What is JPG and what is JPEG?
JPG
The ".jpg" extension exists because early DOS and Windows file systems limited extensions to three characters (the "8.3" naming rule). To fit, "jpeg" was shortened to "jpg". The file contents are exactly the same JPEG-compressed data.
JPEG
The ".jpeg" extension is the original, full spelling matching the standard's name (JPEG). Systems without the old three-character limit, such as macOS and Linux, happily use it. It produces an identical file to .jpg.
When to use which
Choose JPG
Use .jpg if you want maximum convention compatibility — it is the most widely seen extension and what most cameras and apps default to.
Choose JPEG
Use .jpeg if you prefer the original spelling; it works everywhere modern. If a website demands one specific extension, simply rename the file — no conversion is required.
Convert between these formats
Use our free, browser-based converters: