JFIF vs PNG
| Property | JFIF | PNG |
|---|---|---|
| Full name | JPEG File Interchange Format | Portable Network Graphics |
| File extensions | .jfif | .png |
| Created by | C-Cube Microsystems (Eric Hamilton), later ITU and ISO | PNG Development Group (W3C Recommendation) |
| Introduced | 1992 | 1996 |
| Compression | Lossy JPEG, identical to a .jpg file inside | Lossless: every pixel is kept exactly |
| Transparency | No | Yes, full alpha channel with soft edges |
| Animation | No | Only as APNG, which few apps play |
| Typical size | — | Often 3–10× larger than JPG for photos; small for flat graphics |
| Opens on | Opens wherever JPG does, but some upload forms reject the .jfif extension | Every browser, phone, computer and image editor |
| Best for | Nothing special: it is a JPEG with an unusual extension | Screenshots, logos, text and graphics with transparency |
Why convert JFIF to PNG?
A .jfif file is a JPEG with an unusual extension, usually created when Windows saves an image from the web. Some apps and websites do not recognise the extension. Saving as PNG solves that and gives you a format designed for editing: every pixel is stored exactly, so cropping, annotating or adding text and saving again will not degrade the image.
Converting to PNG does not improve the picture. Any JPEG compression already in the image stays; PNG just stops more from being added. Expect the PNG to be several times larger than the JFIF, especially for photos. If you only need the file to be accepted somewhere, JFIF to JPG keeps it small.
PNG is also the better choice when you are going to put the image into a design app such as Canva or Figma and add sharp text or graphics on top.