JPG to WebP Converter
You run a website or an online shop and your photos are JPG. Page speed matters, and WebP is built to carry photos in less space. This converter turns your JPG files into WebP locally, shows the size of each result next to the original, and lets you decide whether the trade-off is worth it for your pictures.
Embed this tool on your websiteShow code
Free to use on any site. Paste the code where you want the tool to appear. It runs inside the page; visitors' files are processed in their own browser and are not uploaded.
WordPress and most site builders have a "Custom HTML" block where this code can be pasted. The embed keeps a small link back to CalcMaster.
How to convert JPG to WEBP
- Add your JPG files by dropping them, clicking the drop zone or pasting.
- The output format is already set to WEBP. Adjust quality or size if you need to.
- Press Convert and compare the original and new size for each file.
- Download each file or all of them as a ZIP.
When to convert, and when not to
- You publish photos on a site and want lighter pages for visitors.
- You can serve a JPG fallback to software that still cannot open WebP.
- You want to test your own images instead of trusting a general claim about savings.
- Skip it for pictures that go to e-mail attachments, printers or older programs that expect JPG.
What changes
- The file is encoded again as lossy WebP, so a small amount of extra detail can be lost on top of what the JPG already lost.
- The quality slider controls how hard the encoder compresses. Lower values give smaller files and more visible softness.
- Metadata such as camera model and GPS position is not kept.
- Rotation from a phone is applied, so the image keeps its upright look.
- The result is a still image with no transparency, since a JPG carries none.
How to judge the result on your own photos
The saving from WebP depends on the picture. A busy landscape, a plain product shot on white and a screenshot of text all behave differently. Instead of relying on a rule of thumb, convert three or four typical images from your site, then compare the original and new sizes shown on each row. Open the results at full size and look at edges, skin tones and gradients such as skies.
If a gradient shows banding or a face looks waxy, raise the quality slider and convert again. Settings that suit one photo may be too harsh for another, so it is fine to use different values for different groups of images.
Keeping a JPG fallback
Current browsers read WebP, but not every program does. Email clients, older office software, some print services and a few upload forms still expect JPG. A sensible habit is to keep your original JPG files and publish the WebP version only where you control how it is shown.
Because this tool never overwrites your source file, you can convert, test the page, and delete the WebP if it does not help. Nothing is changed on your device except the files you choose to download.
Resizing is often the bigger win
Many sites serve photos far larger than the space they fill. Use the resize option to cap the width, for example to the widest size your layout displays. Fewer pixels reduce the file more reliably than any quality setting, and you can combine both. The converter keeps the aspect ratio so the picture is not stretched.
Tips for converting a whole batch
Group images by type before you start: product shots, banners and portraits often want different quality values. Convert one group at a time with a setting you have tested, then spot-check a few files from each group at full size. Files are processed one after another, so the page stays responsive even with many photos, and the ZIP download gathers every result in one go.
Privacy: your files stay on your device
- The tool decodes, resizes and encodes your pictures with your browser. The files are never sent to a server.
- To check it yourself: open the browser developer tools (F12), open the Network tab, convert a file, and look for any request that carries your image. You will see none.
Frequently asked questions
Is WebP always smaller than JPG?
Often, but not for every picture. The size next to each converted file tells you the real result for yours.
Does converting lose quality?
Yes, a little, because both formats are lossy. Raise the quality slider if you see softness.
Will WebP open everywhere?
Current browsers open it. Some older apps and services do not, so keep your JPG too.
Can I convert a whole folder?
Select many files at once, convert them one after another, and download a ZIP.
Do you upload my photos?
No. Everything stays in your browser.
Which quality value should I start with?
Start near the default, view the result at full size, and move the slider only if you see softness or want a lighter file.