Convert JPG to WebP
Drop in your JPGs, pick a quality, and download WebP files. Each row shows what the conversion actually saved.
Conversion happens inside this page using your browser's own image engine. Your files are never uploaded.
How to use it#
- Drop your JPG or JPEG files onto the box above.
- Move the quality slider and watch the output size in each row change.
- Download the files you want, or all of them together.
How much smaller a photo gets#
WebP typically writes a photograph in about a quarter to a third less space than JPG at the same visual quality. On a page carrying a dozen images that is the difference between a fast load and a slow one, and on a phone connection it is the difference people actually notice.
The size in each row is measured on the file your browser produced rather than estimated, so the number you are deciding on is the real one. If a particular photo does not shrink much, you will see that straight away instead of finding out after you have replaced everything.
Compressing an already compressed photo#
A JPG has already had detail removed, and re-encoding it as WebP removes a little more. The artefacts the JPG encoder left behind are part of the image now, so the WebP encoder faithfully preserves them and then adds its own.
In practice this is invisible on a photograph at anything above about 75%. Converting from the original camera file, if you still have it, always beats converting a JPG that has already been through a resize and a re-save.
What WebP is safe for#
Every current browser displays WebP, so anything being served to a web page is fine. Email clients are less consistent and some desktop software still will not open one, which is worth checking before you convert the only copy you have.
Nothing here overwrites your originals. The JPGs you drop in are read and left alone, and the WebP arrives as a separate download.
Frequently asked questions#
Are my photos uploaded anywhere?
#
No. Your browser does the decoding and encoding itself, so the photos stay on your device. The tool keeps working with the network switched off.
How much smaller will the WebP be?
#
Usually a quarter to a third smaller than the JPG at a similar quality, though it varies a lot by image. Each row reports the measured size of the file that was actually produced.
What quality setting should I pick?
#
The default suits most photographs. Below about 70% you start to see smearing in smooth areas like skies and skin, and text in a screenshot falls apart sooner than a photograph does.
Can I convert the WebP back to a JPG later?
#
Yes, though each round trip costs a little quality, so keep the original JPG if you can rather than treating the WebP as your master copy.
Is there a limit on how many files I can convert?
#
The tool imposes none. The real limit is your device memory, and very large images can fail to decode on an older phone.