Is there any difference between a .jpg and a .jpeg file?

No. Same format, same bytes, same everything — only the extension text differs. The short form exists because MS-DOS allowed three-letter extensions and the long one did not fit.

Why does this take no time at all?

Because there is no conversion to do. PhotoTray confirms the file is a JPEG and renames it. A tool that takes several seconds per file is decoding and re-encoding your photo, which costs quality and gains nothing.

Can I do a whole folder?

Yes, with no limit on the count. It is the reason to use a tool rather than renaming by hand.

Free converter

JPGJPEG

JPG to JPEG Converter

The same conversion as JPEG to JPG, running the other direction, and it is the same non-event: these are one format with two spellings. PhotoTray verifies the file and renames it. Nothing is decoded, nothing is re-encoded, and the image you get out is byte-for-byte the image you put in.

Download for Windows

Windows 10/11 (x64) · Free · No account

Drop in your files — Same file, new extension — no re-encoding, so no quality loss at all.

Why convert

Why convert JPG to JPEG

Because something has specifically asked for a .jpeg. It is usually an upload validator or an older enterprise system checking the extension text rather than reading the file — and while that is their bug, you still have to get past it. Some submission guidelines also name JPEG because the author preferred the formal spelling.

An upload form that lists .jpeg and silently rejects .jpg.
Older enterprise or Java software that matches on the long extension.
A style guide or submission spec that names JPEG explicitly.
Normalising a folder so every file uses the same extension.

How it works

Convert JPG to JPEG in a few clicks

1
Drop your JPG files in
A file, a selection, or a whole folder.
2
PhotoTray checks each header
The JPEG signature is verified before anything is renamed, so a mislabelled file cannot end up with a misleading name.
3
It renames them
Instantly, losslessly, with the image data untouched.

The details

JPG to JPEG, at a glance

What actually happens: A verified rename — the image data is never touched
Quality loss: None. The file is byte-identical
Safety check: The JPEG file header is verified before renaming
Speed: Instant, even on thousands of files
Where it runs: Your own PC — nothing is uploaded
Platform: Windows 10/11 (x64)

Questions