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How to Convert PNG to WEBP
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When Do You Need to Convert PNG to WEBP?
Converting PNG to WebP is a page speed decision. WebP files are considerably smaller than PNG at the same visible quality and keep transparency, so swapping images on a website usually cuts page weight without any visible change.
What Happens When You Convert PNG to WEBP
Sharp decodes the PNG and encodes WebP. The encoder can work losslessly or lossily, and either way WebP is more efficient than PNG for the same content. The alpha channel is preserved, which is what makes WebP a genuine replacement for PNG rather than for JPEG only. The saving is largest on photographic content and smaller on flat graphics that PNG already handles well. Pixel dimensions do not change.
Worth knowing before you convert
Keep the PNG as your source. WebP is the delivery format, and re-editing a lossy WebP repeatedly degrades it as any lossy format would.
About PNG and WEBP
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/webp
Image format employing both lossy and lossless compression. It is currently developed by Google.
Conversion Notes
Image conversion from PNG to WEBP preserves colour information and dimensions. If WEBP 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
Yes. WebP supports an alpha channel, so logos and cutouts convert without gaining a background.