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JFIF to JPG: a lossless rename, or a full re-save

A .jfif file is a JPEG with an unfamiliar name. Free here, you can give it a .jpg name without touching the picture at all, or re-save it with new settings. Nothing is uploaded.

Converted on this computer · nothing uploaded · no signup · no watermark

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What a JFIF file is

JFIF stands for JPEG File Interchange Format. It is the header that most JPEG files start with, so a .jfif file is a JPEG picture. Some Windows programs and browsers save pictures with the .jfif ending, and then a website, an app or an upload form that expects .jpg refuses it. The pixels are fine; only the name is a problem.

Two ways to fix it

  • Just rename it. Because the file already is a JPEG, giving it a .jpg name is enough. For a .jfif file this page does exactly that by default: the file's bytes are copied unchanged and only the name is new, so there is no recompression and no loss. The tick box says so, and clears the quality settings away while it is on.
  • Re-save it. Untick that box to run the picture through the converter: a new quality, a fill if it has transparency, a stamped dpi, or a PNG, PDF, BMP or ICO instead.

What goes wrong

  • A rename that does nothing. Renaming by hand works too, but Windows hides extensions by default, so many people end up with picture.jfif.jpg. This page names the file for you.
  • Re-saving costs quality. A JPEG re-compressed is compressed twice. That is why the lossless copy is the default for this page.
  • Not actually a JPEG. The page reads the file's own first bytes, not its name. A .jfif that is really something else is converted through the picture path instead of being renamed.

The settings, for this conversion

  • Just rename it. On by default for a .jfif file. The picture, its quality and its resolution stay as they are.
  • Quality, fill and resolution. Shown when you turn the rename off: quality 90 to start, a fill colour for any transparent areas, and the dpi to write in.

How to do it

  1. Drop the .jfif file, or choose it.
  2. Leave the rename ticked for a lossless copy, or untick it to change settings.
  3. Download the .jpg.

Open the picture here, choose how to save it, and download. Everything happens in this page: the picture is read and rewritten by your browser, with no upload and no account. You can confirm that on the Network tab of your browser's developer tools.

One picture, or a whole folder

Converting one picture at a time is free, with no watermark and no limit. If you load several, you can pick any of them to preview and save on its own. Pro converts every loaded picture in one go and saves them as one ZIP (up to 30 at a time) with a short report of what was made. A folder of .jfif files is renamed in one go the same way.

Other conversions

The same tool opens with a different pair on each page, and any picture works on any page.

Questions

Is the .jpg identical to my .jfif?

With the rename ticked, yes: every byte of the picture is copied, and only the name changes. That is why there is no quality choice while it is on.

Why does Windows make .jfif files?

Some Windows programs and browsers name a JPEG after its header format when they save it. It is the same picture; the extension is simply less familiar to other software.

Can I convert a .jfif to PNG?

Yes. Choose PNG under Save as. The picture is opened and written as a lossless PNG, which will be larger than the JPEG.

What if the file is not really a JPEG?

The page checks the first bytes of the file, not the name. If it is another picture format, it is converted rather than renamed, and the result line shows what was made.

Can I rename or convert many pictures at once?

You can load up to 30 pictures and look at each one, but saving them one by one is free and saving them all at once is part of Pro: one ZIP with every converted file and a short report. Your first batch on a device is free to try.

Is my picture uploaded?

No. The picture is opened and rewritten by your browser, in this page, and the page has no code that sends a file anywhere. The site counts that a tool was used and that a file of a certain type was saved, never the picture or its name.