What is a PNG file?
PNG is a lossless format designed for the web. Every pixel is preserved exactly, and its alpha channel supports smooth, variable transparency — which is why logos, icons, and UI screenshots are almost always PNGs. The tradeoff is file size: photographs saved as PNG can be several times larger than an equivalent JPG.
In short, PNG is lossless quality with full transparency. It is best for logos, icons, screenshots with text, diagrams, and any image that needs a transparent background. Its main limitations are large file sizes for photographic content and no animation support.
Why convert PNG to WebP?
WebP was created by Google to replace both JPG and PNG on the web. It supports lossy and lossless compression, transparency, and even animation in a single format. In lossy mode WebP files are typically 25–35% smaller than a JPG of comparable visual quality, which directly improves page-load speed and Core Web Vitals.
Converting from PNG to WebP makes sense when you need website images of every kind — product photos, hero images, thumbnails — where smaller files mean faster pages. WebP is supported by all modern browsers (Chrome, Firefox, Safari 14+, Edge).
Both formats support transparency, and this converter preserves the alpha channel — transparent areas in your PNG stay transparent in the WebP.
WebP uses lossy compression, so use the quality slider to balance file size against fidelity — 80–90% is visually indistinguishable from the original for most images.
How to convert PNG to WebP
Drag and drop one or more PNG files into the box above (or click to browse). Adjust the quality slider if you want smaller files or higher fidelity, then press Convert. Each file is decoded and re-encoded as WebP on your own device in a second or two, and you can download results individually or grab everything as a ZIP.
Unlike most online converters, FileLark never uploads your files to a server. The conversion runs entirely inside your browser using modern web technology, which means it works offline once the page has loaded, there are no file size queues or daily upload limits, and your images can never be stored, scanned, or leaked — they simply never leave your device.