Camera EXIF (ISO, shutter, lens, GPS coords) is preserved by default during JPEG → JFIF when both formats support metadata. Use the privacy option to strip metadata before download if you need to share images without geolocation.
How small can the JFIF get without visible artifacts?
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For JPG / WebP, quality 75-85 typically gets the JFIF 60-80% smaller than JPEG with no visible difference at normal viewing distance. For lossless JFIF (PNG, TIFF), expect smaller savings — usually 5-30% via better deflate / LZW compression. JFIF与JPG具有字节兼容性,因此重命名或转换是元数据操作,而不是重编码。