Rename a JPEG to JPG in your browser
They are one format. The short spelling exists because MS-DOS filenames allowed three characters after the dot, so there is nothing here to convert: your file comes back unchanged, under the name the thing rejecting it is asking for.
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No JPEG to hand?
How to change a .jpeg to a .jpg
A mixture of .jpeg and .jpg is fine, and so is a folder of a hundred. Both spellings are taken here and everything leaves under the shorter one.
The settings arrive at "do not touch this file", and that is the whole trick. Before and after will show the same size, which is the result rather than a fault.
Same photograph, same bytes, same quality it had this morning. The download picks up the "-min" that every tool on this site adds to a filename, and you can edit that back out; the three letters after the dot are the ones that were the problem.
Why one format has two extensions
The committee that published the standard in 1992 called it JPEG, and the filename that went with it was .jpeg. MS-DOS, and Windows behind it, allowed exactly three characters after the dot, so every tool written for a PC shortened it to .jpg while Unix and Mac software carried on with the longer one. Neither spelling ever meant anything about the file. Open a .jpg and a .jpeg in a hex editor and both start with the same three bytes, both decode with the same decoder, and both are described by your file manager as a JPEG image.
What goes wrong is never the picture. It is a form, a printer, a school portal or a CMS that checks the last few characters of the filename against a short list somebody typed years ago and forgot to put .jpeg on. The file is perfectly valid and the check is wrong, but the check is the one holding the door, so the fix is to change the name. Renaming it is the correct repair, and it is one you can do yourself in your own file manager in about ten seconds.
This page exists because most tools that answer this search re-encode the photograph to make it look like work happened. Re-encoding a JPEG always costs a little detail, every time, and it is a strange price to pay for four characters. So at quality 100, with no width cap and no target size, nothing is encoded at all: the file you dropped is the file you download, byte for byte, under the other name. Move any one of those three controls and it becomes a real re-encode, and the panel shows you the size change when it does.
JPEG and JPG FAQ
Is a JPG different from a JPEG in any way?
No. Not in quality, not in compression, not in what can open it, not in anything a program can measure. They are the same format under two spellings of the same extension, and our own dropzone folds .jpeg, .jpe and .jfif into one before it looks at a single byte.
Then why did the upload form reject my .jpeg?
Because it is reading the filename rather than the file. A validator with a list of allowed extensions that says jpg, png, gif will turn away a perfectly ordinary JPEG whose name happens to end in the longer spelling. Nothing is wrong with your photo, and giving it the other name is all that is needed.
Could I not just rename it myself?
You could, and if you have one file it is the fastest route. On Windows, switch on file name extensions in the View menu of File Explorer, then press F2 and change .jpeg to .jpg. On a Mac, click the name in Finder, edit it the same way, and confirm when it asks whether you meant to change the extension. This page is for doing several at once, and for the times a phone or a locked-down work laptop will not let you edit a filename at all.
Does the picture lose any quality here?
Not at the settings the page arrives with. The encoder never runs: at full quality, with no width cap and no target size, there is nothing to re-encode, so what downloads is your own bytes with a different name. Move the quality slider, change the width or set a target size and it becomes a real re-encode, which does cost quality and cannot be undone.
Does this remove EXIF, GPS or other metadata?
No, and that is worth knowing rather than assuming. Because your file is handed back untouched, everything it carries comes with it: the camera make and model, the timestamp, the thumbnail, and the GPS coordinates if location was switched on when the photo was taken. Renaming a file has never removed any of that. The other way round is worth knowing too: the controls here that do re-encode, a target size or a lower quality or a smaller width, rebuild the file from pixels and drop the EXIF as they go. If stripping it is what you actually want, the JPG compressor does that deliberately, with "Strip EXIF & GPS" turned on.
Are my JPEG files uploaded to convert them?
No. The JPEG is decoded and the JPG is written by your own browser, in this tab. There is no upload endpoint in the site for a file to go to, which you can check in your network tools: convert something and watch that no request carries it. Disconnect from the network after the page loads and it still works.
Related
Same format joins the queue. Anything else re-routes to its own tool.