JPEG to JPG Converter
Convert JPEG to JPG online, free
A form says JPG only and rejects your .jpeg, even though they are the exact same format. This relabels your files to .jpg right in the browser, with no re-encoding and zero quality loss, because there is genuinely nothing to convert beyond the extension.
Drop images here or click to upload
JPEG / JPG only — up to 50MB each
- Files never leave your device
- Runs in your browser
- Free, no signup
How it works
- 1
Drop your JPEG files
Drop a single .jpeg or up to 100 files together. Anything that is already a JPEG works, whichever extension it currently has.
- 2
Files are relabeled, not re-encoded
imgkilo keeps the original bytes exactly and only swaps the extension to .jpg. No decoding, no quality loss, no change in file size.
- 3
Download .jpg files
A single file downloads immediately, batches arrive as a ZIP, every name already ending in .jpg.
Why this is a rename, not a real conversion
Zero quality loss
Because the format is already identical, there is nothing to re-encode. The output is byte-for-byte the same as your input, just with a .jpg extension instead of .jpeg.
Clears extension-only requirements
Many upload forms and older programs check the extension, not the contents. Renaming to .jpg satisfies a JPG only field that was wrongly rejecting your .jpeg.
Batch in one drop
Normalize a whole folder of mixed .jpeg and .jpg files to a consistent .jpg in a single batch, then download them all as a ZIP.
Where this helps
Extension-validated upload forms
A form labeled JPG only rejects .jpeg files even though they are the same format. Renaming to .jpg lets the upload through without changing the image at all.
Older or picky software
Some legacy programs, photo kiosks, and import tools only list files ending in .jpg. A folder of .jpeg files becomes usable the moment the extensions match.
Consistent file pipelines
Scripts that match *.jpg silently skip .jpeg files. Normalizing everything to .jpg keeps a batch job or asset pipeline predictable.
Phone and tablet renaming
Renaming a pile of files is awkward on a phone. Dropping them here and downloading a ZIP with .jpg extensions is faster than fixing each by hand.
Tips that help
- 1
Want a smaller file? This is not it
Renaming does not change the size. To actually shrink the file, use Compress to size, which iterates the JPG quality to hit a KB target.
- 2
Need a real format change?
If you want transparency or a smaller modern format, convert to WebP instead. If a tool needs lossless PNG, use the JPG to PNG converter.
- 3
On a desktop, you can rename by hand
Because the bytes are identical, renaming .jpeg to .jpg in your file manager works too. This tool just makes it painless for many files or on mobile.
JPEG vs JPG: the same file with two names, and why the rename still matters
This is the rare image conversion where the honest answer is that there is nothing to convert. JPEG and JPG are two names for one format, identical down to the byte. Yet the search exists for a real reason: extensions still gatekeep files in the wild, and people genuinely need a .jpg when they have a .jpeg. This guide explains where the two extensions came from, proves they hold the same data, covers the actual situations where the rename matters, and explains why imgkilo refuses to re-encode the file the way some converters quietly do.
Where two extensions for one format came from
The format is JPEG, named after the Joint Photographic Experts Group that standardized it. Its natural extension was .jpeg, four letters.
Then MS-DOS and early Windows arrived with the 8.3 filename rule, which allowed at most three letters after the dot. The system trimmed .jpeg down to .jpg, and that shortened form spread across Windows for decades.
Modern operating systems dropped the three-letter limit long ago, so .jpeg is perfectly valid again. But .jpg never went away, because billions of files, tools, and habits were built around it. Today both are everywhere, used interchangeably.
So when you see .jpeg and .jpg side by side, you are not looking at two formats. You are looking at one format wearing two labels for a historical reason that no longer applies but never got cleaned up.
They really are the same bytes
You can prove this without any tools. Take a .jpeg file on a desktop, rename it to .jpg, and open it. It works perfectly, because you changed the label on the box, not what is inside.
Every JPEG file, regardless of extension, starts with the same marker bytes and follows the same internal structure. Image viewers and editors identify the format by reading those bytes, not by trusting the extension, which is why renaming never corrupts anything.
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This is also why a real conversion is unnecessary here. Converting JPG to PNG or WebP changes how the pixels are stored. Converting JPEG to JPG changes nothing about storage, so the only honest operation is a rename.
If you ever need to actually change the format, that is a different job. To shrink the file, compress the JPG to a target size. To get transparency or a smaller modern format, convert to WebP.
When the rename genuinely matters
Extension validation is the big one. Plenty of upload forms check the extension rather than the file contents, and a form that says JPG only will reject a .jpeg even though it is the same format. Renaming to .jpg lets it through.
Legacy and picky software is the second. Some older programs, photo kiosks, and import tools only list or accept files ending in .jpg. A folder of .jpeg files becomes invisible to them until the extension matches.
Automation is the third. Scripts and batch jobs often match a pattern like *.jpg. A stray .jpeg slips past the filter and gets skipped, so normalizing everything to .jpg keeps a pipeline consistent.
In all three the file is fine, the label is the problem. That is exactly what this tool fixes, in bulk, without touching the image.
Why imgkilo does not re-encode
Many online JPEG to JPG converters quietly decode your image and re-encode it as a fresh JPG. That changes the bytes, shifts the file size, and throws away a little quality on every pass, because JPG is lossy and each save compounds the loss.
There is no reason to pay that cost when the format is already correct. imgkilo takes the original file and outputs the same bytes with a .jpg extension, so the result is identical to the source. No quality loss, no size change, nothing to second-guess.
Practically, you drop your files, the tool relabels each one, and you download. A single file comes straight back, and a batch arrives as a ZIP with every extension already set to .jpg.
All of it happens in your browser. The image never leaves your device, so even private photos and documents stay local. Free, no account, no ads, no watermark.
Frequently asked questions
Honest answers to what people ask before using this tool.
Further reading
Independent references if you want to go deeper on the formats and tradeoffs.