First: rename or re-save?
Because the formats are identical, a simple rename is usually all you need. Reach for a true re-save only when an app is choking on metadata or you want a guaranteed-clean standard JPEG. Both are below.
Windows
Turn on file extensions, then rename:
- Open File Explorer → View → tick File name extensions.
- Right-click the file → Rename.
- Change the ending from
.jpegto.jpgand press Enter.
Prefer a re-save? Open it in Paint → File → Save As → JPEG picture.
Mac
- Click the filename once to select it, then again to edit it.
- Replace
.jpegwith.jpgand confirm "Use .jpg".
For a re-save: open in Preview → File → Export → Format: JPEG.
Phone (iOS & Android)
Mobile file managers can rename too, but the easiest route is a browser-based
converter: open it, upload the .jpeg, download the .jpg.
No app install required.
Command line (bulk)
Got a whole folder to change at once? One line does it:
# macOS / Linux
for f in *.jpeg; do mv -- "$f" "${f%.jpeg}.jpg"; done
Get-ChildItem *.jpeg | Rename-Item -NewName { $_.Name -replace '\.jpeg$','.jpg' }
Doing it in bulk online
If the command line isn't your thing, most online converters accept many files in one
go — drop the whole set in, and every file comes back with a .jpg
extension. That is the friendliest option for non-technical users with dozens of
photos.
Still unsure whether you even need to convert? Read JPEG vs JPG, or return to the overview.