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How to Convert PNG to JPG
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When Do You Need to Convert PNG to JPG?
PNG files from screenshots, exports and design tools are often far larger than they need to be for sharing. Converting PNG to JPG cuts the size sharply, which matters for email attachments, upload limits, and any web page where the image weight affects how fast the page loads.
What Happens When You Convert PNG to JPG
Sharp decodes the PNG and encodes a JPEG. PNG is lossless and JPEG is not, so this is the point where compression starts discarding detail, and it cannot be undone by converting back. The other change is transparency: PNG supports an alpha channel and JPEG has none, so transparent areas are filled with a solid background. Photographs convert extremely well and shrink dramatically. Screenshots of text, diagrams and line art fare worse, because JPEG softens hard edges.
Worth knowing before you convert
Repeatedly editing and re-saving a JPEG compounds the loss each time. Keep the PNG as your working copy and export to JPG once.
About PNG and JPG
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).
image/jpeg
Stream of standard JPEG images sent via pipe.
Conversion Notes
Image conversion from PNG to JPG preserves colour information and dimensions. If JPG 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
For photographs, often five to ten times smaller. For flat graphics and screenshots the saving is smaller and the quality cost is more visible.