Convert images to WebP, free and private
· RelMedia
WebP files are on average about 30% smaller than JPEG at the same visual quality, and every modern browser displays them. CrispSize converts your photos to WebP in your browser, so nothing is uploaded, and creates every width your website needs in one go.
| WebP size | Width | Typical use |
|---|---|---|
| Retina hero | 2400 px | Full-width banners on high-density screens |
| Hero banner | 1920 px | Full-width banners |
| Large | 1200 px | Large images inside a page |
| Content | 800 px | Images in articles and text |
| Thumbnail | 400 px | Cards, lists, thumbnails |
Why WebP
According to Google, lossy WebP images are on average around 30% smaller than JPEG at comparable quality, and lossless WebP is about 26% smaller than PNG. WebP also supports transparency. Lighter images load faster, which helps your Core Web Vitals and your visitors on mobile data.
Does every browser support WebP?
Yes, every current browser displays WebP, including Safari since version 14. For a safety net, CrispSize gives you ready-to-paste <picture> code that serves WebP (or AVIF) first and keeps a fallback.
A note about Safari
Safari can display WebP, but it can't create WebP files in the browser. If you convert from Safari, CrispSize exports an optimized JPEG instead and tells you. For WebP files, use Chrome, Edge or Firefox.
Want even lighter files? AVIF
AVIF is often 20 to 30% lighter than WebP. Turn on "Also export AVIF" in CrispSize to get both, then serve AVIF with a WebP fallback in a <picture> tag.
Convert to WebP in 3 steps
- Open CrispSize: the website WebP sizes are pre-selected.
- Drop JPG, PNG, WebP, GIF or iPhone HEIC photos. Large photos are never upscaled.
- Download the ZIP: WebP files in
web/, pluspicture-snippets.htmlwith code ready to paste.
Questions
Is converting to WebP free?
Yes. CrispSize is free, with no account and no file limit.
Are my images uploaded to a server?
No. The conversion runs in your browser. Your photos never leave your device.
How much smaller is WebP than JPEG?
Around 30% on average at similar quality, according to Google's WebP documentation. Results vary by photo.
Can I convert iPhone HEIC photos to WebP?
Yes. CrispSize reads HEIC photos and exports WebP for the web and JPEG for social media.