PNG to WebP converter
Turn PNGs into WebP images that load faster on websites while keeping transparency. Converted on your device in seconds; nothing is uploaded.
Drop your images here
JPG, PNG, WebP, AVIF, HEIC and GIF, up to 100 MB each
How it works
Convert in three steps
- 1
Drop your PNG images in, or choose them from your device.
- 2
Graviton converts them to WebP right in your browser.
- 3
Download each WebP, or all of them as one ZIP.
Why convert PNG to WebP?
PNG is lossless and supports transparency, which suits screenshots and graphics but makes photos large. WebP is a web format that is usually 25–35% smaller than JPG, but some editors, upload forms and older apps reject it.
What happens to quality?
Images are converted at WebP quality 80, which keeps graphics crisp and transparency intact. Turn on "Lossless" for pixel-perfect output.
Frequently asked questions
Is WebP supported everywhere?
Every modern browser displays WebP. Some older apps and upload forms still don’t, so keep a PNG copy if you need one.
Are my images uploaded?
No. Graviton converts and compresses inside your browser, so your images never leave your device. Nothing is sent while you compress. When you download, the browser sends only a one-way fingerprint of the image, so the download can be counted and approved. Graviton stores none of it.
Can I process many images at once?
Yes. Drop up to 250 images at once and download them one by one or together as a ZIP that keeps the original file names. On Free, each image counts once a day against your 3 downloads; Pro has no daily limit, so the whole batch downloads at once.
Is it free?
Yes. Compressing and converting are free and unlimited, with no account needed. Downloading needs a free account, which includes 3 downloads a day with every format and setting. Pro removes the daily limit.