Convert PNG to WebP
You convert PNG to WebP by dropping the PNG into the box above; the WebP target is already selected, so one click on Convert finishes the job. Everything runs locally in your browser through WebAssembly, with no upload step at all.
Drop your PNG here
It becomes a WebP right in your browser, up to 100 MB
Your file never leaves your device
Why convert PNG to WebP?
WebP is the workhorse swap for web images: you keep the transparency that pushed you to PNG in the first place while cutting most of the weight. A PNG hero image or product shot with an alpha channel routinely drops by half or more as WebP, which translates directly into faster page loads and better Core Web Vitals. Since every current browser renders WebP, the old compatibility argument for serving PNG on the web has mostly evaporated. The main holdouts are non-browser software and some CMS plugins.
What is PNG?
PNG (Portable Network Graphics) is a lossless image format from 1996. It compresses with DEFLATE, keeps every pixel exactly as authored, and supports a full 8-bit alpha channel for transparency. That makes it the default choice for screenshots, UI mockups, logos and anything with sharp edges or text. The tradeoff is size: photographs stored as PNG are often several times larger than a visually identical lossy file.
What is WebP?
WebP is an image format Google released in 2010, built on VP8 video coding. It offers both lossy and lossless modes, supports transparency in both, can hold animation, and typically lands 25-35% smaller than a comparable JPG. Every modern browser has rendered it since Safari 14 arrived in 2020, but plenty of desktop software, older CMS upload forms and printing services still refuse it.
Quality and what to expect
This converter encodes lossy WebP at the default quality, which is visually very close to the source for typical photos and graphics but is not pixel-identical, so keep your PNG master if you may need to re-edit. The alpha channel is preserved: transparent and semi-transparent regions come through intact. Very fine single-pixel patterns, like dithering or hairline grids, are where lossy WebP visibly diverges first. EXIF and other metadata are not carried into the output.
PNG to WebP FAQ
Does WebP keep my PNG transparency?
Yes. WebP supports a full alpha channel even in lossy mode, and this converter passes it through, so cutout logos and UI elements stay transparent.
How much smaller is WebP than PNG really?
It depends on content. Photographic PNGs often shrink 70-90% because they were a poor fit for lossless storage. Graphics with large flat areas shrink less dramatically, and tiny icons may barely move.
Is anything sent to a server while converting?
Nothing is. The libwebp encoder is compiled to WebAssembly and runs on your CPU, in your browser tab. The file never crosses the network, which you can verify in the developer tools network panel.
Can older browsers still show the WebP?
Every browser released since 2020 renders WebP, including Safari from version 14. Only genuinely ancient browsers or non-browser tools (some image viewers, older Photoshop versions without plugins) will balk.
Should I use WebP or AVIF for my site?
AVIF compresses harder but encodes slower and has slightly younger support. WebP is the safe, fast default; if you chase every kilobyte, convert to AVIF as well and serve both with a picture element.