JFIF to JPG Converter

What a JFIF file actually is

Here is the thing most JFIF to JPG converter pages will not tell you: a .jfif file already is a JPEG. JFIF stands for JPEG File Interchange Format, the 1992 specification that defines how JPEG-compressed data is wrapped in a file. Almost every .jpg on your computer is technically a JFIF (or its sibling, Exif) file. The .jfif extension shows up when Windows saves an image whose MIME type is image/jpeg but whose name has no extension, which happens a lot with pictures dragged out of a browser, Outlook, Facebook or WhatsApp Web. The data inside is ordinary JPEG; only the three letters at the end are unusual.

How this JFIF to JPG converter works

Drop the .jfif files above. Your browser decodes each one with its normal JPEG decoder, draws the pixels onto a canvas and re-encodes them as a .jpg at the quality you set (92% by default). The new file downloads straight from the tab; nothing is uploaded. The re-encode is what makes the result a clean, standard JPEG that every app and upload form accepts, and it strips any odd metadata that caused the misnaming in the first place. Because the image was already JPEG-compressed, the output at 92% is visually identical and about the same size, sometimes slightly smaller.

Several files can be converted in one batch; use "Download all" to save them one after another. EXIF orientation is respected, so nothing comes out sideways.

The two-second alternative: rename it

Since the bytes are already JPEG, you can also just rename photo.jfif to photo.jpg and most software will open it. On Windows, enable "File name extensions" in Explorer's View menu first, or the rename will silently produce photo.jpg.jfif. To stop Windows creating .jfif files in the first place, open the registry key HKEY_CLASSES_ROOT\MIME\Database\Content Type\image/jpeg and change the Extension value from .jfif to .jpg. Renaming is fine for your own use; converting here is better when you are submitting the file somewhere that checks the content, because the re-encode produces a textbook JPEG header.

Quality: does converting lose anything?

Re-saving a JPEG always involves a second round of lossy compression, but at 92% the difference from the original is far below what you can see, typically a fraction of a percent of pixel values. If you want to guarantee zero change, rename instead of converting. If you want a smaller file, lower the slider: 80% roughly halves the size of a typical photo with no visible change at normal viewing sizes.

Privacy and related tools

Files pulled from email and chat are often personal, so it matters that this converter never sends them anywhere. The work is done by your browser's canvas, offline if you like. For a lossless copy use the JPG to PNG converter, which accepts .jfif too. To bundle a stack of JFIF or JPG scans into one document, try the Image to PDF converter.