PNG to WebP
Turn PNG images into much lighter WebP files, transparency kept. Nothing is uploaded.
Choose the PNG images to convert
PNG files, as many as you like. Other image formats your browser can open work too.
Convert to
Transparency is kept.
- 1. Choose your PNG images
- 2. They are converted on your device
- 3. Download the WebP files
To convert PNG to WebP, choose your PNG files above: each one is re-encoded as a WebP that is usually far smaller, with transparency kept. You set the quality, see the size before and after, and download the files one by one or as a ZIP. The conversion runs in your browser, so nothing is uploaded.
Why convert PNG to WebP
PNG is lossless: it stores every pixel exactly. That is perfect for editing and terrible for weight. A phone screenshot can easily be 2–4 MB as PNG; a photo exported as PNG can reach 10 MB or more.
WebP was designed for the web. It supports transparency like PNG and compresses like a modern JPG, so:
- Websites load faster. Smaller images mean better page speed, which matters for visitors on mobile data and for search ranking.
- Uploads fit size limits. Many forms and platforms cap images at 1–5 MB.
- Storage and sharing get lighter. A folder of screenshots can drop from hundreds of megabytes to tens.
All current versions of Chrome, Edge, Firefox and Safari display WebP, so for anything shown in a browser it is a safe choice.
How to use the converter
- Choose one or more PNG files, or drop them in. Other images your browser can open work too.
- The output is preset to WebP. You can switch to JPG or PNG at any time.
- Set the quality (40 to 100, default 90). Lower means smaller.
- Compare the before and after sizes, then download each file or all as a ZIP.
Can your browser create WebP?
Every modern browser can show WebP, but not every browser can write it from a web page. Chrome, Edge and Firefox can. Safari, on Mac and iPhone, often can't: asked for a WebP, it quietly produces a different format. The tool checks what your browser actually produced and tells you if WebP isn't available, instead of handing you a mislabeled file.
If that happens, open this page in Chrome, Edge or Firefox, or choose JPG as the output: for photos without transparency, JPG at quality 80–90 also gives large savings over PNG.
What changes when PNG becomes WebP
- File size. Usually much smaller. The tool shows the exact difference per file.
- Transparency. Kept, including soft edges and shadows.
- Detail. WebP at quality 90 is lossy but very close to the original. Fine text in screenshots holds up well at 85 and above; below 70 you may notice soft edges around letters.
- Pixel dimensions. Unchanged. If the image is larger than it needs to be, resizing saves more than any quality setting: try the image resizer first, or use the image compressor to aim for a size in KB.
- Colors. Saved in sRGB, the standard for screens.
- Metadata. PNGs can hold text chunks and EXIF, including the software that made them and sometimes a location. The image is redrawn and re-encoded, so that metadata is not carried into the WebP.
| Image type | Typical saving |
|---|---|
| Photo saved as PNG | Large |
| Screenshot with text and UI | Medium |
| Logo or icon with few colors | Small, sometimes none |
If a small, flat-color graphic doesn't shrink, keep the PNG: it was already efficient.
Screenshots worth keeping private
PNG is the format of screenshots, and screenshots are often what we least want others to see: a boarding pass, a bank transfer, a two-factor backup code, a message thread, a medical result from a patient portal. Converting them saves space, but they still sit in the camera roll, synced and in plain view.
sigil. gives them their own place on the phone. Imported images are encrypted with a 256-bit key that only your sign unlocks; metadata is stripped on import and on export; there's no account and no server. If you share an image later, see how to share photos privately for options that don't leave copies everywhere, and the EXIF remover for cleaning files before they leave your device.
Frequently asked questions
How much smaller is WebP than PNG?
It depends on the image. Photos saved as PNG often shrink by 70–90% as WebP; flat graphics and screenshots shrink less, sometimes only 20–40%. The tool shows the before and after size of each file.
Does WebP keep transparency?
Yes. Transparent and semi-transparent pixels are kept, so logos and cut-outs stay on no background.
Why does the tool say my browser can't create WebP?
Some browsers, notably Safari, can open WebP but can't write it from a web page. The tool detects this and tells you; use Chrome, Edge or Firefox, or pick JPG or PNG as the output.
Is PNG to WebP lossless?
Not at the quality slider's usual settings: the tool uses lossy WebP, which is what makes files much smaller. At quality 100 the result is visually very close to the original, but still re-encoded.
Are my PNG files uploaded?
No. The conversion happens in your browser, on your device. Nothing is sent to any server.