WebP Optimizer
Convert and compress images to WebP, the format that makes websites load faster. WebP files are typically 25–35% smaller than JPG at the same visual quality and keep transparency like PNG. Choose the quality or a target file size, limit the dimensions if needed, and optimize a whole folder of images at once.
- Files stay on your device
- No sign-up
- Free to use
How to use WebP Optimizer
- Drop images onto the page.
- Choose quality or a target file size.
- Optionally set a maximum width or height.
- Optimize and download the WebP files.
WebP Optimizer features
Smaller than JPG
Typically a quarter to a third smaller.
Transparency
Kept from PNG and WebP sources.
Target size
Hit an exact size limit.
Resize
Maximum width and height.
Comparison
Before-and-after slider.
Private
Converted in your browser; nothing is uploaded.
When to use WebP Optimizer
- Images for websites, shops and blogs.
- Converting PNG graphics with transparency to lighter files.
- Meeting page-speed targets.
- Preparing image sets for apps.
WebP Optimizer FAQ
Do all browsers support WebP?
Yes, all current browsers display WebP. Some older desktop programs may not open it; keep originals for editing.
Is WebP lossless here?
This tool uses lossy WebP, which gives the biggest savings. At quality 95–100 the result is visually lossless for most images.
Should I use WebP or AVIF?
AVIF is often smaller still, but encodes more slowly and is newer. WebP is the safe, fast choice; AVIF is worth it for large hero images.
What happens with already optimized WebP files?
If the result is not smaller, the original is kept.
Are my files uploaded?
No. Everything happens in your browser.
Why WebP
WebP was developed by Google to reduce the weight of images on the web. Its lossy mode is based on the video codec VP8, which predicts each block of pixels from its neighbours and stores only the difference. This makes it more efficient than JPG, especially at medium qualities, and it supports an alpha channel for transparency.
For a typical website, images account for most of the downloaded bytes. Converting JPG and PNG images to WebP reduces page weight noticeably, improves loading times on mobile networks and helps performance metrics such as Largest Contentful Paint.
The optimizer decodes your images, optionally reduces their dimensions, and encodes them with the browser’s WebP encoder. In target-size mode, it searches for the highest quality that fits your limit, the same way the JPG optimizer does.
Transparent PNGs keep their transparency, which makes WebP a convenient replacement for heavy PNG graphics such as product photos on transparent backgrounds.
To publish WebP with a fallback for very old software, use the HTML picture element: list the WebP file as a source and keep a JPG or PNG in the img tag. Browsers pick the first format they support, so every visitor gets an image.
Start with quality 80 for photos and 90 for graphics with text. If a page has a fixed image budget, the target-size mode is the quickest way to stay within it for every image in a batch.
All encoding runs on your device.