Drop your JPG file(s) here
You can add more than one file
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This gives you .jfif files out of .jpg files. JPG to JFIF matters in exactly one situation, which is when something on the other end has been written to accept that extension and nothing else. The image data is JPEG either way, so what changes is the label on the file.
Scanning software, older document management systems, and internal tools built long enough ago that whoever wrote them typed .jfif into a list of allowed extensions and moved on. It is rarely a preference. It is almost always a validator nobody has updated.
The file is decoded and written again rather than simply relabelled, which is what makes the output reliably valid. The practical consequence is worth knowing. Every JPEG re-encode costs a little detail, invisible once but cumulative, so convert from the photo you started with rather than putting the same image through several times.
Where this saves real time is on a batch. Add the lot, let the queue work through them, and take the finished files as a single ZIP instead of clicking through a download for each one. If one file in the batch fails, it says so on its own row and the rest carry on without you.
Row by row control
Any single file in the queue can be sent to a different format than the rest.
One archive for the batch
A folder of finished .jfif files comes back as a single ZIP rather than a stack of clicks.
Failures stay visible
A file that cannot be read is marked on its own row instead of silently vanishing.
JPG to AVIF Converter
Re-compress JPG photos as AVIF files that are far lighter at much the same visible quality.
JPEG to PNG Converter
Write JPEG photos out as lossless PNG files ready for editing or for tools that only take PNG.
JPEG to JPG Converter
Give .jpeg files the shorter .jpg extension that many upload forms and older programs still require.
JPEG to JFIF Converter
Save JPEG images with the .jfif extension for systems that were written to accept only that name.
The contents are. Whether a given program treats them the same depends on whether it checks the extension or the file itself, and plenty still check the extension.
Yes, Photos handles them directly. It is third party and older business software that tends to balk.
No. Width and height come through untouched, and nothing is scaled or cropped along the way.
That row reports the failure and the remaining files finish normally. You can remove the bad one and download the rest.