Drop your .jfif files into the box above and they come back as PNGs, or as JPGs if you switch the format. The converter works on as many files as you add, shows the size of every result, and saves the whole set as one ZIP. It runs in your browser, so nothing is uploaded and there is no signup.
What a JFIF file is
JFIF stands for JPEG File Interchange Format, the standard container for JPEG images. Almost every JPEG photo you have ever seen is technically a JFIF file; the name only becomes visible when a file is saved with the ending .jfif instead of .jpg. That happens with some pictures saved from websites, and the file inside is an ordinary JPEG.
The trouble is the ending, not the picture. Photo apps usually open a .jfif file, but many upload forms, older programs and online services check the file name and accept only .jpg, .jpeg or .png. Converting gives the picture an ending that everything recognizes.
PNG or JPG: which to choose
- PNG keeps every pixel exactly as it was decoded, with no further compression loss. It is the better choice when you will edit the picture again, crop it or add text. The file is larger, often several times the size of the JFIF.
- JPG keeps the file small. Because the JFIF is already a JPEG, saving it as JPG compresses it once more; at the starting quality of 92% the change is very hard to see. Choose JPG when a form limits the file size or only accepts .jpg.
- WebP makes the smallest files for websites that support it.
Under Crop, resize and file size you can also shrink large photos, crop a batch to one shape, or aim for a maximum file size with JPG and WebP.
Renaming instead of converting
Because a .jfif file is already a JPEG, renaming it to .jpg often works. On a computer, rename the file and confirm the change of ending when asked. Converting is simpler on a phone, where file endings are often hidden, and it is the only option when you need a PNG. It also checks that the picture really opens: a damaged file shows an error on its row instead of failing later in an upload.
Converting a batch
Add as many files as you need, by dropping a folder's worth or choosing several at once. Each row shows the picture's size in pixels and the file size before and after. Open Preview to look at a result closely, download single files, or save everything in one ZIP. Converted files keep their original names with the new ending, and duplicate names get a number, so nothing is overwritten.
Remove the background too
A JFIF photo has a solid background, and so does the PNG made from it. To cut the subject out onto a transparent background, open the converted picture in the background remover, or use the Remove background button on its row. To go the other way and flatten a transparent PNG into a JPG, use PNG to JPG.
Frequently asked questions
What is a JFIF file?
A JPEG photo with a different ending. JFIF, the JPEG File Interchange Format, is the standard way JPEG images are stored, so a .jfif file holds the same kind of picture as a .jpg file.
Why won't a website or app accept my JFIF file?
Many upload forms and apps check only for the endings .jpg, .jpeg or .png, so they turn away a .jfif file even though its contents are a normal JPEG. Converting it gives the file an ending they recognize.
Can I just rename a .jfif file to .jpg?
Usually, yes. The contents are already a JPEG, so changing the ending to .jpg is often enough. Converting is the safer choice when renaming is awkward, such as on a phone, or when you need PNG.
Should I convert to PNG or JPG?
PNG saves the picture without any further quality loss but makes a larger file. JPG makes a small file and re-compresses the photo slightly; at the starting quality of 92% the difference is hard to see.
Will the PNG have a transparent background?
No. JPEG images, including JFIF files, have no transparency, so the PNG has the same solid background. To make the background transparent, use the background remover after converting.
Are my files uploaded?
No. The converter reads, converts and saves each file inside your browser, so the pictures never leave your device.