ImgSquash

PNG to WebP Converter

PNG is lossless and supports transparency, but files are often far larger than needed. Converting to WebP gives you files roughly 25–35% smaller than JPG at the same visual quality — ideal for websites. Lossless compression works by finding repetition, and photographs have very little. A photo saved as PNG is routinely five to ten times the size of the same photo as a good-quality JPEG with no visible difference — which is the single most common cause of a slow-loading page. Images going onto a website, where the 25–35% saving over JPEG is bandwidth and Core Web Vitals rather than an abstraction. Drop your files below; everything runs locally through the Canvas API, with no upload, no size limit and no account. Check where the result has to open before you commit to a batch — every current browser reads WebP, but desktop and office software is patchier, so it is a format to publish in rather than to hand to somebody.

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What a PNG file actually is

PNG arrived in 1996 as a patent-free replacement for GIF and compresses with DEFLATE — the same algorithm as ZIP. Nothing is discarded, so a PNG decodes to exactly the pixels that went in, and it carries a full 8-bit alpha channel rather than GIF's single transparent colour.

Screenshots on every operating system default to PNG, as do exports from design tools and most logo and icon assets. Anything with crisp edges, flat colour or a transparent background has probably been living as a PNG.

What you get from WebP

WebP output uses lossy compression with a quality control, but unlike JPEG it can keep an alpha channel at the same time — one format for photographs and for graphics with transparency.

Every current browser reads WebP; Safari joined in version 14 in 2020, which was the last real holdout. Desktop applications are patchier, so it is a format to publish in rather than to archive in.

What changes when you convert PNG to WebP

This is where the file size actually drops. A PNG stores its image without discarding anything, and WebP's lossy mode decides what the eye will not miss — typically landing 25–35% below a JPEG of matching quality, and keeping the alpha channel while it does so, which JPEG cannot. The catch is not visual but practical: WebP is a format to publish in, and a poor choice for anything you are handing to someone else's desktop software.

Transparency survives intact. Both PNG and WebP carry a full 8-bit alpha channel, so cut-outs, drop shadows and anti-aliased edges convert without a white box appearing behind them, and the result still composites cleanly onto any background colour.

Frequently asked questions

Is this PNG to WebP converter really free and private?

Yes. Conversion happens entirely in your browser using the Canvas API — your PNG graphics are never uploaded to a server, there is no file limit, no watermark and no sign-up.

Can I convert multiple PNG files at once?

Yes — drop any number of files and they convert in one batch. Use "Download all" to save the results as a single ZIP.

Does converting PNG to WebP lose quality?

This is where the file size actually drops. A PNG stores its image without discarding anything, and WebP's lossy mode decides what the eye will not miss — typically landing 25–35% below a JPEG of matching quality, and keeping the alpha channel while it does so, which JPEG cannot. The catch is not visual but practical: WebP is a format to publish in, and a poor choice for anything you are handing to someone else's desktop software.

Will a WebP file open on every device?

In a browser, yes — every current browser has supported WebP since Safari 14 in 2020. Outside the browser it is less certain: older desktop editors, some print workflows and a number of CMS uploaders still reject it. Use WebP for the web and JPG or PNG for anything you are handing to someone else.

Is it worth converting my screenshots away from PNG?

Usually not. Screenshots are exactly what PNG is good at — flat colour, sharp text, few gradients — so they compress well losslessly and JPEG would smear the text. Convert photographs out of PNG, not interface captures.

Related conversions

JPG → WebPPNG → JPGPNG → ICOHEIC → WebPAVIF → WebPGIF → WebP

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