Select JFIF
Choose one or more JFIF, PJP, or PJPEG files from your device.
✦ JFIF IMAGES · PROCESSED LOCALLY
Convert JFIF to PNG
privately in your browser.
Convert JFIF images into losslessly compressed PNG files directly in your browser. This is useful when you want to preserve decoded pixels for further editing without additional compression losses. Your files remain on your device.
Drop JFIF files here
or choose files
JFIF, PJP or PJPEG files · up to 20 files · max. 75 MB per imageSelected images
Files stay on your device
Files stay on your deviceNo accountNo watermark
JFIF TO PNG
From JFIF to a lossless PNG file
PNG stores the decoded pixels without any additional lossy compression.
Confirm PNG
PNG is preset as the output format and does not need a quality slider.
Save the PNG
Download results individually or collect multiple files in a ZIP archive.
FORMAT KNOWLEDGE
What happens when JFIF becomes PNG?
LokalPix reads the JFIF image (technically JPEG) in your browser and stores the decoded pixels losslessly as PNG.
JFIF
JPEG in a standardised container
JFIF contains JPEG-compressed image data. The image compression is identical to JPG.
PNG
Lossless output
PNG stores every decoded pixel value losslessly. For photographs, the PNG file is typically larger than the JFIF.
IMPORTANT
Earlier JPEG losses remain
PNG encoding adds no new losses but cannot reverse earlier JPEG compression artefacts.
FORMAT IN DEPTH
JFIF and PNG compared
Technical background for choosing the right format.
What JFIF is technically
JFIF is a container standard for JPEG image data. The image data itself is encoded with the lossy DCT compression that JPG also uses.
How PNG encodes
PNG uses lossless DEFLATE compression. It is well suited to screenshots, graphics, and further editing without new compression losses.
Why the PNG file is larger
PNG must preserve every pixel value losslessly. For photographs this file is therefore much larger than the JFIF, without looking better.
What is lost?
PNG encoding adds no new losses. Earlier JPEG artefacts from the JFIF source remain part of the image. JFIF metadata are not transferred by default.
FREQUENT QUESTIONS
Questions about JFIF to PNG
Answers about quality, privacy, and format limitations.
Does PNG improve JFIF quality?
No. PNG stores the decoded pixels losslessly but cannot repair earlier JPEG losses.
Why is the PNG file larger?
PNG is lossless and is usually larger than JFIF for photographs. Larger does not automatically mean more image detail.
Are resolution and aspect ratio preserved?
Yes. LokalPix does not intentionally change the pixel dimensions during this conversion.
Are metadata preserved?
Metadata are removed by default. JFIF APP0 markers are not transferred to the PNG file.
Will the PNG get a transparent background?
No. JFIF has no alpha channel. Converting to PNG does not automatically make the background transparent.
Can I convert several JFIF files?
Yes. Up to 20 files can be processed in one batch and downloaded individually or together as a ZIP archive.
PRIVACY BUILT IN
Your images belong to you.
Conversion uses your browser's built-in functions. There is no image upload and no cloud storage.
Technology and data flow in detail →- ✓ Processing in your browser
- ✓ No server-side image storage
- ✓ No user account