JFIF to JPG
Rename and re-wrap JFIF files saved from the web or email into standard JPG that every app recognizes. Free, fast and secure, no sign-up. Everything runs locally in your browser and your file is never uploaded.
Higher = sharper but larger (PNG is lossless, no slider needed)
Frequently asked questions
Essentially, yes. JFIF is the most common way JPEG data is packaged — the contents are JPEG, just with a different extension. Some browsers save downloads as .jfif, which a few programs won't open.
Practically none that you'd notice. Since both share the same core, this mainly fixes the extension and wrapper; image cat re-encodes at high quality with no visible difference.
It's a known Windows file-association quirk and has nothing to do with the image itself. Saving it as .jpg lets every image app open it normally.
Updated · image cat team