ALL IMAGE TOOLS56
PNG to WebP
Convert PNG to WebP Online — Up to 80% Smaller
Dramatically reduce PNG file sizes by converting to WebP.
About PNG to WebP
PNG files can be very large, especially for photographs or complex graphics — a single high-resolution PNG can easily exceed 10 MB. WebP offers both lossy and lossless compression that is dramatically more efficient, often producing files 60-80% smaller than PNG while maintaining excellent visual quality. This is particularly impactful for web developers looking to improve page load times, reduce bandwidth costs, and boost Core Web Vitals scores. This tool converts your PNG files to WebP format entirely in your browser, with an adjustable quality slider so you can control the trade-off between file size and quality. For images where transparency is important, WebP supports alpha channels just like PNG, so you do not lose that capability in the conversion. Use cases include optimizing website assets, preparing images for content management systems, and compressing screenshots before sharing. Since all processing runs locally in your browser using the Canvas API, your images are never uploaded to any server. Batch support lets you convert multiple files at once.
Questions
How much smaller is WebP compared to PNG?
WebP files can be 60-80% smaller than PNGs, especially for photographs. For graphics with flat colors, the savings are typically 30-50%. Either way, you'll see significant size reduction.
Does WebP support transparency like PNG?
Yes! WebP supports alpha channel transparency just like PNG, but with much better compression. It's the best of both worlds — small files with full transparency support.
Is converting PNG to WebP lossy?
By default, the conversion uses lossy WebP compression (like JPG). You can increase the quality slider to maximum for near-lossless results, though the file will be larger.
Can the WebP end up larger than my PNG?
Occasionally, yes — tiny icons and heavily optimized flat-color PNGs can grow, because lossy WebP is tuned for photographic detail. The Delta stat shows the true size change before you download, and it loses its green tint whenever the output grew, so a bad trade is never hidden.
Can I convert the WebP back to PNG later?
Yes — the WebP to PNG tool does the reverse. But this conversion is lossy, so a round trip gives you a PNG of the compressed pixels, not your original; keep the source PNG if you might need it again.
Is my file uploaded to a server?
No. Transmute processes everything locally in your browser using JavaScript and WebAssembly. Your files never leave your device — there is no server, no upload, no cloud processing.