A .jpeg file is already a JPG. Rename it and you are done, or drop it here for a smaller file, a stripped file or 50 at once.
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JPEG · PNG · WEBP · AVIF · HEIC · up to 50 at once · max 30 MB each
Auto tunes each image.
A hard cap for the number your form demands.
A floor for forms that refuse small files.
Empty side keeps the ratio. Never enlarges.
No: both names point at one standard, ITU-T Recommendation T.81, approved in September 1992. The JPEG committee lists the same document as ISO/IEC 10918-1. MDN lists a single media type for it, image/jpeg, with five extensions: .jpg, .jpeg, .jfif, .pjpeg and .pjp. So there is no better spelling, no newer spelling and nothing to convert. The post is JPG and JPEG the same shows the same bytes under five names, measured.
The two spellings exist because of an old limit. Microsoft's file naming documentation records that the MS-DOS FAT file system allowed eight characters for a name and three for the extension. On PCs, .jpeg became .jpg to fit, and both survived. Where a .jpeg name comes from today does not matter. The app that saved the file chose four letters, and either name is correct. Microsoft's support page on file extensions says a rename changes nothing about a file except its name. That sentence is the whole conversion.
Three steps in File Explorer, and a folder of them in one PowerShell line further down.
jpeg with jpg after the dot, and press Enter. Leave the rest of the name alone. That is the whole edit.Finder does the same job with Return instead of F2.
.jpeg to .jpg and press Return again. Apple's guide on renaming lists exactly that sequence: select, Return, type, Return.
Finder does it without typing a name. Select the files, Control-click, choose Rename and pick Replace Text. Put .jpeg in Find and .jpg in Replace with; that is Apple's own batch rename. On Windows, Microsoft's Rename-Item documentation gives a one-line example that renames every file in a folder by extension. With the extensions swapped in, it reads:
Get-ChildItem *.jpeg | Rename-Item -NewName { $_.Name -replace '.jpeg','.jpg' }Microsoft notes that the match is not case sensitive, so PHOTO.JPEG renames too. Dropping the same folder here gives 50 .jpg files back in one ZIP, each re-encoded on Auto to a smaller size. A file without tags that cannot shrink comes back as your original bytes instead.
In four cases, and the tool above exists for them. First, a portal that reads bytes. Microsoft's MIME detection documentation describes FindMimeFromData reading the first 256 bytes of a file. When the content disagrees with the declared type, the content wins. A site that checks the same way accepts a renamed .jpeg, because it is a JPEG. It rejects a renamed WebP or PNG whatever the file is called. Second, a size limit: a rename saves zero bytes. Our 576.8 KB reference photo landed at 99.7 KB under a 100 KB cap and 48.7 KB under 50 KB. Third, EXIF and GPS: a rename keeps every tag, and this page strips them by default (tick Keep EXIF metadata in Advanced settings to keep them). Our proof file is 33.6 KB, stored sideways with orientation tag 6. Stripped, it came out at 18.3 KB, upright at 267 by 400 pixels, with the metadata gone. Fourth, a batch that must all land under one cap: set Max file size once and every file obeys it.
A rename loses nothing, because not one byte changes. A re-encode through the tool is measured, not guessed. Our 576.8 KB reference photo became 339.6 KB at quality 85 and 273.9 KB on Auto, a 52.5% saving. Encoding at quality 75 gave 253.3 KB. Encoding that output again at 75 gave 251.9 KB after three passes and 251.9 KB after ten. A file without tags never comes back bigger. Under a 1 MB cap the same photo returned untouched at 576.8 KB, because nothing needed doing. A JPEG in and a JPEG out counts as a compression here, not a conversion. It does not spend a plan's conversion allowance.
Because it checks more than the name. A form that only reads the extension accepts the rename. If it still refuses the file, one of three rules is in play. It may check the bytes, and then the file was never a JPEG. A WebP or PNG saved with a .jpeg name stays a WebP or PNG. Drop it here and the tool names what it really is. It reads the format from the first bytes, never from the name, and then converts for real. It may enforce a size limit, which the Max file size cap meets exactly. Or it may want a pixel size, which the editor's crop and resize handle. The image to JPG page covers the first case for every source format.
The same way, in reverse: change .jpg to .jpeg and nothing else, because they are one format. If a form insists on the four-letter spelling, the rename above satisfies it. This tool always names its output .jpg, so for a .jpeg name rename after downloading. Neither spelling is newer, better or more compatible. The batch rename above works in this direction too: swap the two endings in the command.
Same rename, different cause. The JFIF to JPG page explains the Windows registry value behind it and how to stop it.
Drop it on the image to JPG page. The tool reads the bytes and converts HEIC, PNG, WebP and AVIF for real.
Compress JPG runs the same engine with the same caps; no rename is involved.
Short answers specific to this page. The tool above settles most of them in a second.
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Every route in and out runs on the same engine and the same rules. Each card is its own page.
Freeze the current pixels. Lossless from here, and the right move before editing or archiving.
The safe upgrade. Around a third smaller at matching quality, and readable essentially everywhere.
Roughly half the bytes of WebP on most photos. Slower to encode, worth it at scale.
HEIC, PNG, WebP or AVIF in, a .jpg out. Drop up to 10 files, cap the size if a form demands it, and download one ZIP.
A .jfif file is a JPEG that Windows named oddly. Rename it and it opens everywhere; drop it here when a portal, a size cap or a batch needs the bytes changed.
A rename fixes the name. The tool fixes the bytes: a hard size cap, EXIF gone by default, 50 files in one ZIP. Free, no signup, files wiped automatically.
Convert JPEG to JPG