Optimize images for WordPress — compress featured images, WooCommerce products and media library files to speed up your site. Free, no plugin needed, runs in your browser.
All recommended WordPress image dimensions for 2026. Upload at these exact sizes and compress before uploading to avoid any quality loss from platform-side re-compression.
| Type | Width x Height | Aspect Ratio | Notes |
|---|---|---|---|
| Featured Image | 1200 x 628 px | 300:157 | Social sharing and blog header — matches OG image ratio |
| Thumbnail | 150 x 150 px | 1:1 | Default WordPress thumbnail size |
| Medium | 300 x 300 px | 1:1 | WordPress default medium size used in content |
| Full / WooCommerce | 2560 x 2560 px | 1:1 | Max size — WordPress scales down from this via srcset |
Open the Compress tool, upload your WordPress images and set quality to 80%. SammaPix compresses in your browser — nothing is uploaded to a server, so your images stay private.
Convert to WebP using the WebP tool for an extra 25-35% size reduction. WordPress 5.8+ supports WebP natively and generates srcset variants automatically.
Download the optimized files and upload to your Media Library. For WooCommerce, upload product images at 2560px max width — WordPress will create all needed thumbnail sizes via wp_get_attachment_image_srcset.
Ready to optimize?
Use Compress to reduce file size without quality loss, or Convert to WebP for an extra 25-35% size reduction.
Plugins like Smush, ShortPixel and Imagify process images on external servers after you upload them, which means your originals leave your site and the plugin uses server resources. SammaPix compresses images in your browser before upload — zero server load, zero privacy risk, and you start with already-optimized files.
1200x628 px works best because it matches the Open Graph standard for social sharing (Facebook, LinkedIn) and looks great as a blog header. Compress it under 120 KB with SammaPix for fast loading.
Download your existing images, batch-compress them with SammaPix, then re-upload. For new content, always optimize before uploading. You can also add define('JPEG_QUALITY', 82) to wp-config.php to reduce the quality of server-generated thumbnails.
Yes, since WordPress 5.8 (July 2021) you can upload WebP files directly to the Media Library. WordPress generates srcset variants for WebP just like for JPEG and PNG. Convert your images to WebP with SammaPix before uploading for the best results.
Largest Contentful Paint (LCP) is directly affected by image file size. Compressing your hero and featured images with SammaPix can reduce LCP by 1-3 seconds on average, which improves both user experience and Google ranking.
Optimize for Shopify
4 sizes - Product Image, Collection Banner, Slideshow / Hero, Featured Product
Optimize for Wix
4 sizes - Hero Banner, Gallery Image, Logo, Blog Featured
Optimize for Webflow
4 sizes - Hero Background, CMS Thumbnail, Background 2K, Portfolio Image
Optimize for Etsy
4 sizes - Listing Image, Search Thumbnail, Shop Banner, Shop Icon
No uploads
All compression happens entirely in your browser. Your images never leave your device.
Batch process
Optimize multiple images at once with the same settings. Download all as ZIP in seconds.
Free forever
Core optimization tools are completely free. No watermarks, no ads, no file limits.