Compress images for the web
Optimize images for your website: compress to modern WebP with a live quality comparison, entirely in your browser. Smaller pages, faster loads, better rankings.
Privacy-first: every image is processed locally in your browser. Nothing is uploaded, stored or transmitted to any server.
Images are the page-weight problem
Images account for roughly half the bytes of a typical web page, and oversized ones are the most common cause of poor Largest Contentful Paint scores — a Core Web Vitals metric that feeds into search rankings. Optimizing them is the highest-leverage speed fix most sites have available.
A practical budget
As a rule of thumb: hero images under 200 KB, content images under 100 KB, thumbnails a fraction of that. Converting to WebP during compression (preset here) gets you 25–35% below an equivalent JPG for free, and the before/after slider proves the quality holds. Resize images to their actual display dimensions first for even bigger wins.
Batch a whole site’s assets
Drop your entire images folder in and download an optimized ZIP. Because it all runs locally, there is no per-file pricing, no API keys and no waiting on an optimization service.
Frequently asked questions
- Does my image get uploaded?
- No. All compression happens locally in your browser using the Canvas API. Your files never leave your device and are never sent to a server.
- Does compression reduce quality?
- Lossy formats (JPG, WebP, AVIF) trade a little quality for much smaller files, and the quality slider lets you find the right balance. PNG is lossless, so it stays pixel-perfect.
- Which formats are supported?
- You can compress JPG, PNG and WebP. You can also convert a PNG photo to WebP during compression for much smaller files.
- Can I compress to a specific file size?
- Yes. Switch to “Target size” mode and PixelVault searches for the highest quality that fits under your chosen KB limit.
- Can I compress multiple images at once?
- Yes. Drop in as many images as you like and download them individually or together as a single ZIP file.