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How to Convert JPG to PNG
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When Do You Need to Convert JPG to PNG?
Converting JPG to PNG is worth doing when an image is about to be edited repeatedly, or when a program or workflow specifically requires a lossless format. Design tools, some print processes and certain upload requirements all ask for PNG.
What Happens When You Convert JPG to PNG
Sharp decodes the JPEG and writes a PNG. PNG is lossless, so from this point nothing further degrades no matter how often the file is re-saved. What conversion cannot do is undo the compression that already happened: JPEG artefacts in the source are copied faithfully into the PNG. The file will grow, often several times over, because PNG stores photographic detail far less efficiently than JPEG does.
Worth knowing before you convert
Converting a low quality JPEG to PNG produces a large file that still looks like a low quality JPEG. Start from the best source you have.
About JPG and PNG
image/jpeg
Stream of standard JPEG images sent via pipe.
image/png
PNG is a raster-graphics file-format that supports lossless data compression. It supports palette-based images, grayscale, and full-color non-palette-based RGB or RGBA images. Its most notable feature is support for transparency (alpha channel).
Conversion Notes
Image conversion from JPG to PNG preserves colour information and dimensions. If PNG uses lossy compression (such as JPEG), compression artefacts appear at lower quality settings — use quality 85+ to minimise visible loss. Transparency (alpha channel) is preserved in formats that support it; if the target format does not support transparency, transparent areas are filled with white by default.
Frequently Asked Questions
No. It stops any further loss, but the compression artefacts already in the JPEG are preserved exactly.