Website Image Optimizer
Resize, compress and convert to web-friendly formats in one step. See exactly how much you saved before downloading.
Files never leave your device — 100% browser-based.
Why use this tool?
Built for speed, privacy and simplicity. No accounts, no installs, no watermarks.
Preparing hero images and blog illustrations for a website.
Cutting page weight to improve Core Web Vitals (LCP).
Converting old JPGs to modern WEBP or AVIF.
Bringing 4K phone photos down to web-friendly dimensions.
How it works
Three simple steps. Everything happens in your browser.
Upload an image.
Pick a max width (e.g. 1600px for hero, 800px for body, 400px for thumbnails).
Choose output format (WEBP recommended) and quality.
We show the original size, new size and percent saved. Download the optimized file.
Related tools
Keep going — pair this with another quick tool.
Frequently asked questions
Quick answers about how this tool works.
Which format is best for the web?
WEBP gives the best balance of quality, file size and browser support — every major browser supports it. AVIF is even smaller but compresses slower. JPG is universal but larger. PNG only for graphics with transparency or sharp text.
What max-width should I use?
1600–1920 px for full-width hero images, 800–1200 px for in-article images, 400–800 px for thumbnails and cards. Anything larger than the display size is wasted bandwidth.
Why does file size matter?
Images are usually the largest assets on a web page. Optimising them improves load time, Core Web Vitals (especially LCP), SEO ranking and mobile data usage.
Is quality 80 enough?
For WEBP and AVIF, quality 75–85 is usually visually indistinguishable from the original at typical viewing sizes. For JPG, 80–85 is a safe default.
Does it upload my image?
No. Optimisation happens in your browser using the Canvas API.