JPG to JPEG, a new ending, the same picture.

A JPG to JPEG converter changes a file name from .jpg to .jpeg. Both endings belong to the same format, so a real JPG picture is simply copied under the new name: same data, same quality, same size in bytes. This tool is for the moment a form, an app or a colleague wants the longer ending. It checks the first bytes of every file, shows a checksum of the data before and after the rename, and can switch the letters to capitals, so IMG_2041.JPG can become IMG_2041.jpeg in one step.

How to convert JPG to JPEG

1. Drop your pictures on Drop JPG files here, or click to choose. You can also paste one.
2. Check that Save as says .jpeg. Change Letters to Capitals if you need .JPEG.
3. Look at the label on each row. Real JPEG means the data was copied untouched.
4. Press Download for one file, or Download all as a ZIP for a batch.
5. Use Add more files for the next batch, or Start over.

Worked example: a folder of camera files

Say a form accepts only .jpeg and you have three files: IMG_2041.JPG, IMG_2042.JPG and beach.jpg. Drop all three. With Letters on Small letters you get IMG_2041.jpeg, IMG_2042.jpeg and beach.jpeg. With Capitals you get .JPEG on all three. The stem of the name, the part before the dot, is never changed. If you also drop IMG_2041.jpg, it would collide with IMG_2041.JPG once the endings match, so the second one is named IMG_2041 (2).jpeg and nothing is overwritten.

Same format, two endings

The IANA media type registry lists both jpg and jpeg as file endings of the image/jpeg type (checked 27 Oct 2026). It does not say that one is better or newer, and it does not say why both exist.

Because the registry text is not clear about letter case, use capitals only when a system asks for them. Some systems treat a name in capitals as a different name from the same one in small letters, and some do not.

Files that look like JPG but are not

A name is only a label. A PNG that someone renamed to .jpg still holds PNG data, and a program that reads the contents will say so. This tool looks at the first bytes of the file. If it finds something other than a JPEG, it does not pretend: by default it draws the picture on white and saves a real JPEG, and the row tells you what the file was and the new size. Transparent areas turn white. Switch off Save other pictures as a real JPEG if you want only genuine JPEGs renamed.

Common problems

• The row says the file is not a JPEG. It may be a PNG, WebP or HEIC with a JPG name. Let the tool re-save it, or use PNG to JPG or HEIC to JPG for control over the result.
• The upload form still says no. If the row says Real JPEG, the name is fine. Look at the form's limit on file size or pixel size.
• You want .jpg again later. Change Save as to .jpg, or use JPEG to JPG.

If the file is too big for the form, shrink it first with the image compressor.