What is the process for optimizing images in Webflow?
TL;DR
- Use appropriate image formats (JPEG, PNG, SVG, WebP) and resize/compress images before uploading.
- Leverage Webflow’s responsive image and lazy loading features, and manually optimize background and CMS images.
Optimizing images in Webflow ensures fast load times and better performance across all devices. Here's how to manage image optimization effectively within Webflow.
1. Use Correct File Formats
- JPEG/JPG: Best for photos and complex images with gradients and many colors.
- PNG: Use for images with transparency or fewer colors.
- SVG: Ideal for logos, icons, and illustrations—scalable and lightweight.
- WebP: Supported by most browsers and offers excellent compression. Webflow does not export WebP by default, but you can optimize outside of Webflow and upload WebP files manually.
2. Resize Before Uploading
- Scale images to the maximum dimensions they will display on your site.
- Avoid uploading large images (e.g., 4000px wide) if they will only display at 1200px.
- Tools like TinyPNG, Squoosh, or ImageOptim help reduce file size without quality loss.
3. Enable Webflow Responsive Image Support
- When you upload a JPEG, PNG, or WebP image to an Image element, Webflow automatically generates multiple image sizes (e.g., 500px, 800px, 1080px, etc.) and uses
srcsetto serve the most appropriate size. - This does not apply to background images, inline CMS images, or images used in rich text fields.
4. Optimize Background Images & CMS Images
- Manually resize and compress background images before uploading. Webflow does not auto-optimize background images.
- CMS-hosted images (static images in rich text, image fields, etc.) should also be optimized before upload.
5. Use SVGs When Possible
- Upload vector assets as SVGs for icons, logos, and line-based designs to ensure sharp rendering on all devices with minimal file size.
- Be cautious with editing SVGs from unknown sources to avoid embedded malicious scripts.
6. Use Lazy Loading
- Webflow automatically applies loading="lazy" to images for performance. You can manage this in the Element Settings Panel.
- This defers loading offscreen images until a user scrolls near them, which improves initial load time.
7. Audit Site Performance
- Use Webflow’s built-in audit panel (under the Designer “Audit” tab) to identify large images or optimization issues.
- Test live pages on PageSpeed Insights or Lighthouse for image-related opportunities like “Serve images in next-gen formats.”
Summary
To optimize images in Webflow, use proper file formats, resize and compress before uploading, and leverage Webflow’s responsive image and lazy loading features. Manual optimization is still required for background and CMS images.