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Tool guide
Save a picture from almost any modern website and you get a .webp file that plenty of software still refuses to open: photo kiosks, older Office builds, some upload forms and a lot of desktop viewers. This page decodes the WebP with your browser's own image engine, repaints it onto a canvas and hands back an ordinary JPEG. Nothing leaves the machine. JPEG has no alpha channel, so any transparent area comes out white — expected, not a bug.
That is normal. WebP packs the same pixels roughly 25-35% tighter than JPEG, so going back the other way almost always produces a heavier file. If size matters more than compatibility, keep the WebP, or run the finished JPG through an image compressor to hit a target in kilobytes.
It gets filled with white. The JPEG specification has no alpha channel at all, so there is nowhere to store transparency and the canvas is painted white before export. If you need the cut-out to stay cut out, use the WebP to PNG converter instead — PNG keeps the alpha channel intact.
A little. The WebP was already lossy, and JPEG compresses on top of that, so this is a second generation. On photographs you will rarely notice; on screenshots with text and on hard edges you may see halos around the strokes. Avoid bouncing the same image back and forth repeatedly — the artefacts stack up.
No hard limit is coded in; the ceiling is the memory your tab can claim. Images up to a few dozen megapixels are fine on an ordinary laptop. Very large panoramas can exceed the browser's canvas dimension limits and come back blank — scale the picture down first if that happens.
Not as an animation. WebP can hold a sequence of frames, but JPEG is a single-frame format. The browser hands the canvas only the first frame, and that frame is what you download. For anything that moves you need GIF or a video format rather than JPEG.
It does not. The .webp you pick is read through the browser's own file API, decoded in the tab and painted onto a canvas, and the JPEG is read back out of that canvas. No network request is made during conversion — the page keeps working offline once loaded, and the file stays on your disk.
Yes. Mobile Chrome and Safari both decode WebP and write JPEG through canvas, so the page works on a handset. The result lands in your downloads, and on iPhone it is easiest to move it into Photos straight away. Large images take noticeably longer to convert on older devices.
Before: photo-1024.webp — 210 KB, 1600×1200, grabbed with "Save image as" from a photographer's site. The kiosk terminal does not recognise the format.
After: photo-1024.jpg — same 1600×1200 frame as JPEG. It usually roughly doubles in size, because JPEG compresses worse than WebP, but every device opens it.
Before: logo.webp with an alpha channel: lettering on a fully transparent background.
After: logo.jpg: same lettering, background now solid white. Invisible on a white page, wrong over a coloured block — use the WebP to PNG converter for that.
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