PNG to WebP Converter
Turn a PNG into a smaller WebP — transparency preserved, quality adjustable. Free, private, and your image never leaves your browser.
Why convert PNG to WebP?
WebP usually makes a much smaller file than PNG at the same visible quality, while still keeping a transparent background — so your pages load faster without a white box around logos or icons. Lumisphere converts right in your browser: drop a PNG (or a whole batch), nudge the quality slider, and download WebP. Nothing is uploaded, and there’s no sign-up or watermark.
- 1Add. Drop, paste or browse for an image (or several).
- 2Choose. Pick PNG, JPG, WebP or AVIF — tune quality for the lossy ones.
- 3Download. Save the converted file, or the whole batch.
Other conversions: Image Converter · PNG to JPG · SVG to PNG — the same private, in-browser converter. Need transparency instead? Try the background remover (no upload).
Good to know
How do I convert a PNG to WebP?
Drop your PNG in, keep the format on WebP, and download — the transparency is preserved and the file is usually much smaller. It never leaves your browser.
Does WebP keep PNG transparency?
Yes — WebP supports an alpha channel, so a transparent PNG stays transparent as a WebP. Lumisphere preserves it automatically.
Is WebP smaller than PNG?
Almost always. For photos and rich graphics WebP is dramatically smaller; even for flat logos it’s usually smaller. Use the Quality slider to trade size against sharpness.
Will every browser open my WebP?
All modern browsers (Chrome, Edge, Firefox, Safari) display WebP. Very old software may not — if you need maximum compatibility, convert to PNG or JPG instead.
Is it really free and private?
Completely — no sign-up, no watermark, no limit, and the conversion runs on your device, so the PNG is never uploaded.
How much smaller does WebP get?
For most PNGs, WebP lands 25–80% smaller at a quality that looks identical on screen. PNG is lossless, so a screenshot full of flat UI colour already compresses well and may only shrink a little; a PNG exported from a photo or a detailed illustration is where WebP wins big, because it can use lossy compression while still keeping the alpha channel. Drag the quality slider down and watch the output size update live — somewhere around 80% is usually the sweet spot where the file is tiny but the eye can’t tell.
Will transparency and quality survive?
Yes — WebP keeps the alpha channel, so a logo or icon with a see-through background stays transparent after conversion, which is exactly where it beats JPG. WebP support is now universal across modern browsers, so you can serve it directly on the web; the only place to be careful is very old software or email clients that predate it, where a PNG or JPG fallback is still safer. Because the whole conversion happens in your browser, the original PNG is never uploaded and the result is full-resolution with no watermark.