JFIF to PNG Converter

A JFIF to PNG converter decodes a .jfif file and re-encodes the picture as a PNG. JFIF files turn up on Windows more than anywhere else: save an image from a browser and it lands as photo.jfif instead of photo.jpg, because of how the JPEG media type is registered on the machine. The file itself is ordinary JPEG data. The extension is the part that confuses upload forms, older software and the person who has to open it.

That matters for picking a target. If the only problem is the extension, converting JFIF to JPG is the lossless move, because JFIF and JPG are the same data and the file is renamed rather than re-encoded; the jfif-to-jpg page on this site does exactly that. Converting to PNG is a different job. The JPEG is decoded to pixels and written again with the PNG encoder, so the result is a genuinely new file in a lossless format, which is what you want when the image is heading into an editor, a document template or a build step that should not compress it again.

Two expectations are worth setting. The PNG will be bigger, sometimes much bigger. A 1,024 x 768 scan saved out of a browser as receipt.jfif comes back as receipt.png at the same 1,024 x 768 pixels, and the row shows the size before and after and how much larger the PNG is, because PNG stores every pixel instead of approximating them. And the PNG cannot clean anything up: whatever JPEG compression already did to the edges and flat areas is decoded faithfully and preserved. Lossless from here on, not lossless from the beginning.

The practical limits are short. JFIF has no transparency, so the PNG comes out fully opaque; the converter has no way to invent an alpha channel. Conversion runs through a canvas, which drops EXIF, GPS and color profiles. Pixel dimensions are left as they are. The format is read from the first bytes, so a .jfif that is really a PNG is handled correctly and the row tells you what it found. A .jpg is turned away with a link to the JPG to PNG converter. Images over 100 megapixels are refused with a message, empty files are refused, and there is no byte-size cap. Everything runs client-side, free, no signup, with a daily usage limit.

• Every .jfif is decoded and saved as PNG in your browser with the Canvas API. The images are not uploaded, and files from webmail or scanned documents stay on your computer.
• To enforce the daily limit, the page sends a request with the tool name and a device identifier, plus your sign-in token if you have one.
• After a batch, the page records only the number of files converted, their total size in bytes and the output format. File names and image contents are not sent.
• EXIF fields, GPS coordinates and color profiles from the JFIF are not copied into the PNG. Your original .jfif is not modified, so the metadata remains there.
• Converted PNGs are held in the tab until you remove them, press Clear All or close the page, and nothing is saved on a server.