Convert JFIF to PNG — Fix the File Windows Won't Open
A .jfif file is a JPEG with an unhelpful extension. Convert it to PNG and it opens in every app, with nothing uploaded to a server.
Quick answer: Drop your .jfif file into the JFIF to PNG converter and download the PNG. It runs in your browser, handles batches, and nothing is uploaded.
Convert your JFIF files now Batch · nothing uploaded · free
JFIF stands for JPEG File Interchange Format, and it is the container almost every JPEG on the internet already uses. The extension is the only unusual part. Certain versions of Windows, and Internet Explorer's descendants in particular, save an image copied from a web page with a .jfif extension because of how the format is registered in the system, and once that happens the file is refused by apps that match on extension rather than reading the header.
Nothing about the image is damaged. You can prove it by opening the same file in a browser, which reads the bytes rather than the name. Converting to PNG simply gives you a file whose name and contents agree, so it stops being a problem in every app you open it with.
PNG or JPG — which should you convert to?
Convert to JPG if you only want to fix the extension and keep the file small. The image data can pass through essentially unchanged because it is already a JPEG.
Convert to PNG if you are going to edit the image afterwards. PNG is lossless, so every save from that point on keeps the pixels exactly, whereas each JPEG save discards a little more. The PNG will be bigger — that is the cost of storing every pixel rather than an approximation — and you can bring it back down with the PNG compressor, which re-encodes losslessly.
Frequently Asked Questions
JFIF is a JPEG file. The name is the container specification JPEG images are normally written in, and Windows sometimes saves or renames a downloaded JPEG with a .jfif extension instead of .jpg. The bytes inside are the same, which is why the file opens fine in a browser but confuses apps that only look at the extension.
Because many programs decide what to do from the extension rather than the contents. The image is a perfectly valid JPEG, so nothing is broken — converting it to PNG (or renaming it to .jpg) gives you a file every application recognises.
No, and nothing can. The JFIF was already compressed as a JPEG, so detail that was discarded then is gone for good. Converting to PNG stops any further loss from that point on, because PNG is lossless, but it does not restore what was lost.
Usually yes, often several times larger. PNG stores every pixel exactly while JPEG stores an approximation, so a photograph grows considerably. That is the trade for a lossless file that every app opens. If size matters more, converting to PNG and then compressing it is the sensible order.
No. The conversion runs in your browser, so the image never leaves your device.
Yes. Drop in a batch and they are converted together, with a ZIP at the end.