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Your file is converted locally in your browser. It is never uploaded anywhere.
JFIF is just a JPEG file with a different file extension — this tool decodes it and re-saves it as a standard PNG. Because the conversion happens with your browser's built-in image engine, there's no queue, no file-size limit tied to a server, and no copy of your file kept anywhere once you close the tab.
JFIF (JPEG File Interchange Format) is essentially a JPEG image, just saved with a .jfif extension — common from some messaging apps and browsers.
Some programs don't recognize the .jfif extension even though the image data is JPEG-compatible. Converting to PNG avoids that confusion.
The JFIF/JPEG source is already compressed; re-saving as PNG won't recover lost detail, but it won't lose any further quality either.
No, the conversion is done locally in your browser.