How do I stop Windows saving .jfif?

A registry setting controls it; the simplest fix is to convert or rename files to .jpg as needed.

Will converting JFIF to JPG lose quality?

At the default quality the difference isn't visible. Renaming loses nothing at all.

JFIF vs JPG: What's the Difference?

A .jfif file is a JPEG image, just like a .jpg. JFIF (JPEG File Interchange Format) describes how JPEG data is stored, and most .jpg files use it too.

JFIF vs JPG

The image is the same. The only problem is the extension: many apps and upload forms don't recognize .jfif, so convert or rename it to .jpg.

Convert JFIF to JPG

JFIF vs JPG at a glance

Property	JFIF	JPG
Compression	Lossy (small files, some detail discarded)	Lossy (small files, some detail discarded)
Transparency	No	No
Animation	No	No
Opens in	Most browsers, but many apps and upload forms reject .jfif	All browsers and devices
Best for	Nothing specific: it's a JPG with a less common extension	Photos, sharing, email, social media

Use JFIF for

Nothing specific: it's a naming quirk

Use JPG for

Everything: uploads, sharing, editing

Key differences

Same image data

JFIF and JPG both contain JPEG-compressed images. Quality and size are the same.

Why .jfif appears

A setting in some Windows versions maps JPEG images to the .jfif extension, so images saved from browsers end up as .jfif.

Compatibility

Browsers open .jfif, but many forms, apps and phones don't recognize the extension.

JFIF

What is a JFIF file?

The JPEG File Interchange Format (JFIF) is a standardized image format that encapsulates JPEG-compressed data, defined by the C-Cube Microsystems standard to facilitate file exchange across different platforms. It resolves ambiguities in the raw JPEG interchange format by mandating specific markers (APP0 marker segment) and defining metadata parameters such as pixel density, aspect ratio, and color space (typically YCbCr). While essentially identical to standard JPG files in compression structure, JFIF strictly excludes advanced metadata like EXIF to maintain maximum compatibility with legacy decoders.

How to open a JFIF file

JFIF files are universally supported across all major operating systems, including Windows, macOS, and Linux, which open them natively in default viewers like Microsoft Photos, Apple Preview, and Eye of GNOME. Because the underlying data stream is standard JPEG compression, users can often rename the extension to .jpg without file corruption. Comprehensive support is also built into all modern web browsers (Chrome, Firefox, Edge) and image editing software like Adobe Photoshop and CorelDRAW.

Full Name: JPEG File Interchange Format
Developed By: C-Cube Microsystems
Initial Release: 1991
MIME Type: image/jpeg

JPG

What is a JPG file?

JPG is functionally identical to the JPEG format, differing only in the file extension length, a legacy constraint from the MS-DOS 8.3 filename limit (which allowed only three characters for extensions). It implements the same ISO/IEC 10918 standard, using lossy compression based on Discrete Cosine Transform (DCT) and Huffman coding to store photorealistic images. The file structure contains markers such as Start of Image (SOI) and End of Image (EOI) and supports color spaces like sRGB and CMYK, making it interchangeable with .jpeg files in all software contexts.

How to open a JPG file

As one of the most ubiquitous file types in computing, JPG files open natively on Windows, macOS, and Linux without external software. Default viewers like Microsoft Photos, Apple Preview, and Linux image viewers handle the format automatically. For editing or conversion, industry-standard tools including Adobe Photoshop, Paint.NET, and XnView provide extensive support. Web browsers universally render JPGs without plugins.

Full Name: Joint Photographic Experts Group
Developed By: Joint Photographic Experts Group
Initial Release: 1992
MIME Type: image/jpeg