A JPG file can be larger than the original AVIF because the two formats compress images differently. AVIF generally stores images more efficiently, allowing it to retain similar visual quality with less data. When you convert AVIF to JPG, the converter creates a new file using JPG compression. Even if the picture keeps the same dimensions and looks almost identical, the resulting file may take up more storage space.
The output settings also affect the JPG file size. A high quality setting uses less aggressive compression, which preserves more detail but usually creates a larger file. Image dimensions matter too: a picture with more pixels generally requires more data. Detailed textures, such as leaves or hair, can also be harder to compress than plain backgrounds. A larger JPG does not necessarily mean better quality, since conversion cannot recover details already missing from the original.
To reduce the JPG file size, lower the quality setting gradually and compare the results at your intended viewing size. If the image is only needed for a small preview, reducing its dimensions can help further. Create each new version from the original AVIF to avoid repeated JPG compression. If you do not specifically need JPG and your intended application accepts AVIF, keeping the original may be the most practical option.
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