Convert JFIF images to PNG locally - JFIF is the standard JPEG format; PNG is lossless, no upload.
Running locally on your device ...
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
JFIF (JPEG File Interchange Format) is simply the standardised form of a JPEG file. A .jfif file holds exactly the same image data as a .jpg file - some cameras, email programs and browser downloads just assign the .jfif extension instead of .jpg. That is precisely why many programs do not know what to do with it at first. This tool reads the JFIF and outputs a universal PNG.
The conversion runs entirely locally in your browser (no upload, even offline). The JFIF is decoded like a JPEG and re-encoded as a lossless PNG. PNG is suited for further editing, for programs that will not open a JFIF, and for graphics with sharp edges. Note: PNG cannot recover detail JPEG already discarded, but it avoids further quality loss on re-saving.
You will mostly meet the .jfif extension on images that arrived through certain mail programs or web forms. Instead of laboriously renaming the file and hoping the target program accepts it, you convert it here cleanly into a PNG that opens everywhere. For a smaller photo format, though, JPG is the more compact choice; PNG is lossless and therefore noticeably larger for photos.
| Input formats | JFIF |
|---|---|
| Output format | PNG |
| Batch processing | Yes |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: PNG is lossless and noticeably larger than the JFIF/JPG for photos. Any existing JPEG compression artefacts remain visible - PNG only prevents further loss, it does not make the image sharper. A JFIF has no transparency; the PNG is opaque.
Practically none. JFIF is the standard file format for JPEG; the image data is identical, only the file extension differs.
No. The conversion happens entirely locally in the browser - even offline.
Some older programs only recognise the .jpg extension. After converting to PNG the image opens everywhere.
No. PNG is lossless but cannot recover detail JPEG already discarded; it only prevents further loss.
JFIF/JPEG has no transparency, so there is none to preserve. The PNG is fully opaque.