how to convert jpg to webp (free, no upload)

why convert jpg to webp?

jpg has been the standard for photographs since the 1990s and it's done the job well. but webp, developed by google and released in 2010, compresses images more efficiently using more modern algorithms. the result is smaller files at equivalent visual quality.

in practical terms, a jpg image that's 500kb might become 150-200kb as webp at the same perceived quality. for a website with dozens of images, those savings add up to meaningfully faster load times and better core web vitals scores.

webp also has a few features jpg doesn't, like full transparency support and animation support. but the file size advantage is the main reason most people convert.

how much smaller will webp be?

google's own benchmarks show webp is about 25-35% smaller than jpg at equivalent quality. in practice the savings vary by image content, but you can generally expect something in this range.

the best way to know is to convert and compare. cozyconvert shows you the file size before and after so you can see exactly what you're gaining.

is webp supported everywhere?

this used to be a genuine concern, but it isn't really anymore. webp is supported in all modern browsers: chrome, firefox, safari (since 2020), edge, opera, and samsung internet. as of 2026, global webp browser support is above 97%.

the main places webp still has friction are outside browsers. some email clients don't display webp images inline. older image editing software may not open webp files. if you're sending images directly to people via email, or need them to open in arbitrary software, jpg is still safer.

for web publishing though, webp is now the clear choice for photographs and complex images. if your images live on a website, there's no meaningful downside to webp.

the quality setting matters

both jpg and webp use quality settings that let you trade off file size against image quality. the scales aren't directly comparable though. webp at 80% quality typically looks better than jpg at 80% quality, because webp's compression algorithm is more efficient.

a good starting point when converting jpg to webp is to use 80-85% quality. this usually produces noticeably smaller files than the original jpg while maintaining identical visible quality. you can go lower if file size is more important than quality, or higher if you're converting images where quality is critical.

cozyconvert's quality slider makes it easy to find the right balance. the default is 85% which works well for most purposes.

lossy to lossy conversion: what to know

jpg is already a lossy format, meaning some of the original image data was discarded when the jpg was created. converting a jpg to webp means you're compressing an already-compressed image, which can theoretically introduce additional quality loss.

in practice, at reasonable quality settings (75%+), this second generation of compression is barely perceptible. the visual quality of jpg-to-webp conversions at 80% quality looks identical to the original jpg on screen for almost all images.

if you have access to the original uncompressed source file, converting that directly to webp will give you the best results. but converting from jpg is perfectly fine for most purposes.

converting without uploading your files

most jpg to webp converters online ask you to upload your images to their servers. this means your files travel over the internet and are processed on someone else's computer, which raises obvious privacy questions for personal photos.

cozyconvert runs entirely in your browser. the conversion happens locally using your device's processing power, and nothing is ever sent to a server. you can convert photos of your family, your home, sensitive documents, anything, without any of it leaving your device.

you can also convert up to 10 images at once, which makes batch conversion for a website or photo collection much faster.

jpg to webp vs jpg to png

converting jpg to png makes your file lossless, but it doesn't recover the quality that was lost when the jpg was created. you end up with a large lossless file of a lossy image. unless you have a specific reason to need png (like compatibility with software that doesn't support webp), this is rarely worth doing.

webp is almost always the better destination format if you're converting for web use. smaller files, modern compression, transparency support, and near-universal browser support make it the right choice. if you need a full comparison, check out our guide to image formats for the web.