Step 1: Attach your JPEG files using the button above or by bring and position.
Step 2: Click the 'Optimize' button to start the optimization.
Step 3: Collect your converted JFIF files.
JPEG to JFIF Optimization FAQ
Will JFIF actually be smaller than JPEG?
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Almost always when going from PNG / JPG / TIFF into WebP or AVIF: expect 25-50% smaller than JPG at the same visual quality, 60-90% smaller than PNG. Going the other way (WebP / AVIF back to JFIF = PNG / JPG) typically grows the file because you are leaving a more modern codec for an older one — useful for compatibility, not size.
Does JPEG to JFIF preserve transparency / alpha?
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Transparency survives when JFIF supports alpha (PNG, WebP, AVIF, GIF, TIFF, SVG). Converting to JPG flattens the alpha channel onto white — if you need transparency on the modern web target WebP or AVIF instead of JFIF.
Will the JFIF version look identical to the JPEG on a Retina display?
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At quality 80+ on WebP / AVIF the difference is invisible to anyone but a trained eye even at 3x device pixel ratio. Photos compress slightly more visibly than line art; if your JPEG is screenshots or UI mockups, push quality to 90 or use a lossless JFIF.
Will EXIF camera metadata survive JPEG to JFIF?
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Usually not. In most conversions, camera EXIF fields such as the camera model and GPS position are not carried into the JFIF. There is no setting on this page to keep or remove metadata, so check the result with a metadata viewer if it matters.
Can I batch convert a folder of JPEG files to JFIF?
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Several files in one job need a paid plan. Free use is one file per conversion, one conversion an hour. On a paid plan you can add several files to one job, then download each result on its own or all of them in one ZIP.
Are my JPEG files private during JFIF conversion?
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Yes. Uploaded JPEG files are processed on our own conversion servers, no person reviews them, and they are never shared. The upload and the converted JFIF are both deleted automatically about 24 hours after the conversion, which leaves time to download the result. See /privacy/ for the full policy.
How do I serve the JFIF with a JPEG fallback on my site?
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Use a `<picture>` element: `<picture><source srcset="image.JFIF" type="image/JFIF"><img src="image.JPEG" alt=""></picture>`. Browsers that understand JFIF fetch the smaller file; older browsers fall back to JPEG. WebP is supported in 96%+ of installed browsers, AVIF in 90%+.
Why is my JFIF file unexpectedly bigger / smaller than I expected?
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A JPEG that is already heavily compressed (low-quality JPG) often grows when re-encoded into a lossless JFIF (PNG / TIFF). A high-bitrate lossless JPEG (PNG / TIFF) often shrinks 60-90% when going to a lossy modern JFIF (WebP / AVIF). Image content matters too — photos compress very differently from line art and screenshots.
