Picture Batch PNG to WebP
PNG to WebP
PNG is honest and enormous. WebP does the same job — including full transparency — in a fraction of the space, and every browser released in the last several years displays it. For images headed to a website, this is usually the single largest saving available for the least effort.
Drop PNG images here
PNG files — or any of JPEG, WebP, AVIF, BMP, ICO, TIFF, GIF or camera raw (CR2, CR3, NEF, ARW, DNG, RAF, ORF, RW2). Everything runs on this device.
Your images never leave this device. They are decoded and re-encoded by your own browser, and the security policy on every page blocks this site from sending them anywhere.
Smaller than JPEG and PNG, keeps transparency, supported by every current browser.
The usual range for photographs on the web.
Images keep their original dimensions.
Kept. WebP stores a full alpha channel, so cut-outs and soft edges come through exactly.
Exif is carried across where both formats can hold it. Nothing currently in the queue has any.
Exif metadata can be carried from PNG to WEBP. Colour profiles are not, because decoding converts the image to sRGB.
What happens to your image
Expect a smaller file than JPEG or PNG at the same visual quality, typically by 25–35%.
| Property | Outcome |
|---|---|
| Transparency | Preserved: Kept. WebP stores a full alpha channel, so soft edges and cut-outs survive exactly. |
| Image quality | Partly preserved: WebP is lossy: the image is re-compressed and detail is discarded to make the file smaller. The quality control decides how much. |
| Colour | Partly preserved: Converted to sRGB. Decoding an image colour-manages it into the browser's own space, so the output is sRGB and is left untagged, which every viewer reads as sRGB. A wide-gamut source is reported before conversion. |
| Exif metadata | Preserved: Carried across if you leave metadata switched on, or removed completely if you switch it off. Camera, date and any location tag travel together. |
| Orientation | Preserved: Applied to the pixels, and the tag is reset to upright afterwards so nothing rotates the image a second time. |
Quality 82 by default, and why
At 82 a photographic WebP is typically a quarter to a third the size of the PNG and the difference is not visible at normal viewing sizes. Above 90 the file grows quickly for very little visible gain. Below 70 you start to see softening around edges.
For logos and screenshots, push the quality to 95 or above — or stay with PNG. WebP's lossy mode has the same weakness as JPEG around hard edges, and a flat-coloured image often compresses better losslessly anyway.
Transparency survives exactly
WebP stores a full eight-bit alpha channel, so partial transparency, soft shadows and anti-aliased cut-out edges all come through. This is the main advantage over JPEG and the reason WebP replaced PNG for interface assets on most large sites.
Where the metadata goes
If the PNG carried an Exif block it can be carried into the WebP, which means rebuilding the file in WebP's extended container form — a simple WebP has nowhere to store metadata at all. That rebuild is done here and then the result is decoded again to make sure it still opens; if anything about it fails, the untouched encoder output is used instead and the result says the metadata was dropped.
Switching metadata off removes it entirely, which is the right choice for anything going onto a public site.
If something goes wrong
"This browser cannot encode image/webp."
WebP encoding comes from the browser's own canvas, and a small number of builds do not provide it.
What to do: The output format list only offers formats this browser has proven it can write, so this should not be reachable. If you see it, AVIF or JPEG will work instead.
A logo looks fuzzy at the edges.
Lossy compression applied to hard edges.
What to do: Raise the quality to 95 or above, or keep the PNG. Flat artwork is the case PNG is genuinely best at.
Questions
How much smaller is WebP than PNG?
For photographs, typically 70 to 90% smaller at a quality that looks the same. For flat artwork the gap narrows considerably and PNG can sometimes win.
Is WebP supported everywhere now?
In browsers, effectively yes. In desktop software, mostly, but a long tail of older applications still refuses it — which is why the reverse conversion is one of the most requested things on this site.