Images are simultaneously one of the biggest SEO opportunities and one of the most common causes of poor performance on Wix sites. Optimising images correctly improves page speed, enables image search ranking, and supports accessibility, all of which Google values.
Writing Descriptive Alt Text
Alt text is the text description of an image. It serves two SEO purposes: it helps Google understand what the image shows (supporting relevance), and it improves accessibility for users with visual impairments (a trust and quality signal). Write alt text as a natural description of the image that includes the keyword where it genuinely fits.
Bad alt text: "image1.jpg" or "photo" or keyword-stuffing Good alt text: "Wix SEO audit results showing 300% organic traffic increase in 6 months"
File Naming Before Upload
Name your image files descriptively before uploading to Wix. Use hyphens to separate words, include the primary keyword, and keep it concise. "wix-seo-results-case-study.jpg" is dramatically better than "IMG_4821.jpg" as a signal to Google about what the image contains.
Compressing Images Before Upload
Essential Resources
How to compress images before uploading to Wix
- 1Go to squoosh.app (Google's free image compression tool)
- 2Drag and drop your image into Squoosh
- 3On the right panel, select "WebP" as the output format
- 4Set quality to 80%, this is visually indistinguishable from 100% in most cases
- 5Download the compressed image and check the file size (aim for under 150KB for supporting images)
- 6Upload the compressed image to Wix Media Manager
Complete How-To Guide: Optimising Every Image on Your Wix Site
This step-by-step guide walks you through a complete image optimisation process for your Wix site. Follow every step to ensure all images have descriptive alt text, SEO-friendly file names, proper compression, and correct dimensions.
Follow these steps to optimise every image on your Wix site
- 1Audit all images on your Wix site by going through each page in the editor and noting images without alt text
- 2For each image write descriptive alt text that naturally describes what the image shows and includes relevant keywords where appropriate
- 3In the Wix editor click on each image then click Settings or the Alt Text field and enter your description
- 4Before uploading any new image rename the file with a descriptive keyword-rich name using hyphens instead of underscores or spaces
- 5Convert all new images to WebP format using squoosh.app before uploading to Wix
- 6Compress every image to under 200KB for above-the-fold images and under 100KB for below-the-fold images
- 7Set explicit width and height for every image in the Wix editor to prevent Cumulative Layout Shift
- 8For hero images and above-the-fold images ensure they are no wider than 1400px
- 9Enable lazy loading for all below-the-fold images in the Wix editor image settings
- 10Use the Wix Image Manager to review all uploaded images and identify any oversized files that need replacing
- 11Test your pages in PageSpeed Insights after optimisation and check that image-related warnings have been resolved
- 12Add image structured data for key images using schema markup if they are relevant for Google Image Search
- 13Set a process for all future uploads: rename, convert to WebP, compress, then upload
Final Checkpoint
Every image should have descriptive alt text, be in WebP format under 200KB, and have explicit dimensions. PageSpeed Insights should show no image-related warnings.
