Processed locally in your browser — nothing is uploaded.
JPG to WebP Converter
Quick answer
Re-encode a JPEG photo as WebP to cut file size by roughly a quarter to a third at the same visual quality, the kind of saving that shows up directly in Largest Contentful Paint scores on a website.
What the jpg to webp converter does
WebP and JPEG both use lossy compression tuned for photographs, but WebP is the newer of the two and squeezes more out of the same visual budget. At equal perceived quality, WebP files typically land 25 to 35 percent smaller than JPEG. On a page with a large hero photo, that difference alone can be the gap between a Largest Contentful Paint score that passes Core Web Vitals and one that does not.
The quality slider works the same way it does for JPEG: higher values keep more detail and produce a larger file, lower values shrink the file at the cost of visible softness. Because WebP is more efficient per byte, a WebP at quality 75 often looks closer to a JPEG at quality 85 than the numbers would suggest, so it is worth comparing visually rather than assuming the sliders mean the same thing across formats.
This conversion is a one-way trip in quality terms. The source JPEG has already thrown away some detail during its own encode, and the WebP pass throws away a bit more on top of that. It is the right trade for anything being served on the web, where load time affects real visitors, and the wrong move if you need an archival-quality master copy.
How to use it
Upload the JPEG
Drag or browse a single photo or a batch for a whole gallery.
Set the WebP quality
Start around 75 to 80 and compare against the source before going lower.
Compare file sizes
Check the size reduction shown against the original JPEG; 25 to 35 percent smaller is typical at matched quality.
Download and deploy
Use the WebP as the primary image with a srcset fallback if any part of your audience still uses very old browsers.
Your images never leave your device
Encoding happens through libwebp running as WebAssembly in your browser tab, so a photographer prepping an unreleased campaign shoot for a client preview site is not handing that shoot to a third-party conversion server before the client has even approved the final selects.
- No file is ever uploaded to a server
- Works offline after the first visit
- No account, no watermark, no limits
Format and quality tips
Think in Largest Contentful Paint terms
If a hero image is the largest element on the page, shaving 30 percent off its bytes is one of the highest-leverage changes you can make to a Core Web Vitals score, more effective than most JavaScript optimisation.
Quality numbers do not transfer directly between formats
A WebP at 75 is not the same as a JPEG at 75. Compare the two visually at your target quality rather than assuming the slider values line up.
Frequently asked questions
How much smaller is WebP than JPEG?
Roughly 25 to 35 percent at matched visual quality, though the exact figure depends on the image content. Photos with fine texture tend to see the largest gains.
Does converting JPG to WebP help page speed?
Yes, smaller image bytes mean faster downloads, which directly improves Largest Contentful Paint, one of the three Core Web Vitals Google uses as a search ranking signal.
Will converting to WebP make my photo look worse?
At quality 75 or above the difference from the source JPEG is rarely visible, though you are compressing an already-lossy file a second time, so extremely low settings will show more artefacts than starting from an uncompressed source.
Do I still need a JPEG fallback if I use WebP?
For most modern audiences, no. Every current browser supports WebP; a fallback only matters if your analytics show meaningful traffic from very old browser versions.
What quality setting should I use for a website hero image?
Start at 80 and check the result at full size on the page it will actually appear on. Hero images are usually large enough that low quality settings become visible.
Can I batch convert a whole photo gallery to WebP?
Yes, drop the full set in at once and download the results as a single ZIP, which is faster than converting a gallery folder image by image.
Further reading
- WebP vs JPG vs AVIFJPG is universal, WebP is smaller and works everywhere that matters, and AVIF is smaller still but slow to make. Here is how to choose without guessing.6 min read
- PNG vs JPG: Which Should You Use?The rule is short: photographs go to JPG, anything with sharp edges or transparency goes to PNG. This post explains why, so you never have to guess again.6 min read
- What Is HEIC, and How Do You Open It?HEIC is why an iPhone photo will not open on a friend Windows laptop. Here is what the format is, why Apple chose it, and how to turn it into something everything can read.6 min read