3

I downloaded several images that are are .jfif files. I have various enhancements (e.g. context menus) and processing scripts that are keyed to *.jpg files and would like to use these with the new files.

I have read Are all JPEG files JFIF?, but want to explicitly clarify: is it safe (by which I mean no risk of corruption or errors reading the file, either image data or metadata) to directly rename a .jfif file as a .jpg file?

I am trying to understand whether it's fine to simply rename the files and change the extension directly (i.e. the underlying file format is the same) or whether I need to re-encode/re-save these .jfif files as .jpg files (which might result in some lossy compression / quality loss), because the two file formats are different somehow.

1

Yes.

JPEG is not a file format - it's a compression method. It doesn't specify how the compressed data should be stored in a file. There are two file formats that fill in this gap: the original JFIF, and the newer Exif1. They are very similar, mostly compatible and can even be mixed in a single file. Both use the .jpg extension.

Your .jfif file is a JPEG-compressed image stored in a JFIF file format. It's a valid content for a .jpg file.


1 Technically, TIFF also supports JPEG data, but I don't think I've ever seen such file and it's certainly not a common choice for saving JPEGs.

2
  • 1
    Thanks @gronostaj -- I just wanted to check with you about JFIF/EXIF as from the research I did myself, I read that JFIF is mutually incompatible with the newer Exchangeable image file format, EXIF (which JPEG uses, right?) - Does your answer contradict that then?... To be clear, am not trying to say you are wrong as I freely admit my knowledge of image standards / file-formats is very limited so I may have-misunderstood, am just trying to do a sanity check / correlate the info together in my head. 👍🏼
    – Martin
    Jun 18 at 8:24
  • 1
    @Martin Here you go.
    – gronostaj
    Jun 18 at 12:17

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.