Short answer: To convert JPG to WebP, drop your photos above, choose WebP and click Convert. WebP photos are usually smaller than JPG at similar quality, which helps web pages load faster. Conversion happens in your browser.
If you publish photos on a website, a shop or a blog, their weight decides how fast your pages load. WebP was created to shrink images, and for photographs it commonly produces files noticeably smaller than JPG at similar visual quality. This page converts JPG to WebP in your browser, shows the saving for each file, and never uploads your pictures.
Why do smaller images matter?
Images are usually the heaviest part of a page. Smaller files mean quicker loading on phones, lower data use for visitors and a better experience that search engines can reward. Replacing JPG photos with WebP is one of the simplest speed improvements a site owner can make, and it needs no changes to how the picture looks on the page.
How do you choose the quality?
The default quality of 85 is a good start for photos. Lower it to 70 or 75 for background images and thumbnails, where nobody will inspect the detail, and raise it for hero images that are shown large. Compare the before and after size in the results list and look at one converted picture at full size before you publish a whole batch.
Where does WebP not fit?
Every current browser supports WebP, but some older desktop programs, print services and email clients do not. If the file is going to a person rather than a web page, JPG remains the safest choice. Also keep your original JPG files as masters: converting between lossy formats repeatedly degrades the picture, so always create your WebP copies from the original rather than from another copy.
Testing before a full switch
Before you convert an entire site, pick five typical photos, convert them and replace them on a test page. Compare how the page loads on a phone connection and look closely at faces, skin tones and skies, where compression artefacts show first. If everything looks right, convert the rest in batches. Keep the original JPGs, because some social networks and print services still ask for them. You can also use a rename pattern like {name}-web so the new files are obvious in your folder.
Questions people ask
How much smaller will my photos be?
It varies by picture, but WebP photos are commonly noticeably smaller than JPG at similar quality. The results list shows the exact change.
Can I use WebP in email?
Support is uneven among email programs, so JPG is safer for emails. WebP suits web pages.
Do I need to sign up?
No. The converter is free, needs no account, and your files stay on your device.
Will social networks accept my WebP?
Some do and some convert or refuse it. For posting on social media, JPG remains the safest choice. WebP shines on your own website.
Can I go back from WebP to JPG later?
Yes, but each conversion between lossy formats loses a little detail. Keep your original JPG files and make WebP copies from them, instead of converting back and forth.
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Last reviewed: October 17, 2026