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How to Optimize Images for Web Performance (Core Web Vitals)
Master image optimization for the web: modern formats, lazy loading, responsive images, and how to improve your Core Web Vitals scores.
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Free Online Image Tools
Compress, convert, resize, crop, rotate, apply filters, and add watermarks to images directly in your browser. Supports JPEG, PNG, and WebP without uploading files to any server.
Reduce image file sizes while maintaining quality, convert between formats, adjust dimensions, crop with social media presets, rotate and flip, apply professional filters, and protect your photos with customizable watermarks.
Available features
Quality-controlled compression, JPEG/PNG/WebP conversion with adjustable quality, aspect-ratio-aware resizing, cropping with Instagram/YouTube/Facebook presets, rotate and flip, brightness/contrast/saturation/blur/grayscale/sepia/invert filters, and text watermarking with customizable position, opacity, and tiling.
When to Use JPEG vs PNG vs WebP
Choosing the right image format can make a big difference in quality and file size. JPEG is ideal for photographs and images with many colors and gradients, as it uses lossy compression that dramatically reduces size at the cost of slight quality reduction. PNG is best for graphics, logos, screenshots, and images requiring transparency, since it uses lossless compression and maintains sharp edges. WebP is a modern format developed by Google that offers the best of both worlds: superior compression in both lossy and lossless modes, with files up to 30% smaller than JPEG at the same quality, plus transparency support like PNG. Our converter lets you switch between all three formats with full control over output quality.
Image Optimization for Web
Unoptimized images are one of the leading causes of slow websites. To improve loading speed, compress your images before uploading: a JPEG at 80% quality is usually visually indistinguishable from the original but weighs significantly less. Use the correct dimensions rather than uploading massive images and resizing them with CSS. Serve WebP format when the browser supports it, with JPEG or PNG as a fallback. For icons and simple graphics, consider using SVG instead of raster formats. Our compression tool helps you find the perfect balance between visual quality and file size.
Social Media Image Sizes
Each social network has its own recommended dimensions. For Instagram, the standard square post is 1080 x 1080 pixels, stories and reels require 1080 x 1920 (9:16), and the profile picture is 320 x 320. On YouTube, the ideal thumbnail is 1280 x 720 pixels (16:9), and the banner image measures 2560 x 1440. For Facebook, the cover photo is 820 x 312 on desktop, shared posts work best at 1200 x 630, and the profile picture is 170 x 170. Our cropping tool includes presets for all these platforms, so you can prepare your images for social media with a single click.
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