Optimize alt text, filenames, and image size for better accessibility, search visibility, and Core Web Vitals—without uploading any files.
Runs entirely in your browser · No data stored or sent · Privacy-friendly image SEO analysis
Image SEO is more than just compressing pictures. Clear, descriptive alt text helps screen readers and search engines understand what is on the page, unlocking accessibility and potential image search traffic. Well‑named filenames such as blue-widget-hero.png give search engines extra context and make your media library easier to manage.
Keeping alt text focused (around 125 characters), avoiding phrases like “image of”, and matching the alt to the page intent are simple wins that compound across a site. At the same time, compressed images in modern formats with sizes under about 200 KB for above‑the‑fold visuals can significantly improve page speed, Largest Contentful Paint, and overall Core Web Vitals.
Use this helper as a quick pre‑publish checklist for key visuals: hero images, blog illustrations, product photos, and social cards. Combine strong alt text, clean filenames, and lean file sizes to ship pages that feel fast, accessible, and easy for search engines to interpret.
Overall image SEO score
0 / 100
Based on alt text quality, filename optimization, and file size for all images below.
Image SEO score
0 / 100
Alt text
Needs work
Filename
Needs work
File size
Needs work
Filenames are sanitized for analysis; avoid spaces and unusual characters in production.
For URLs, you can estimate size by downloading the image in your browser and checking file info—no data is ever uploaded here.
# Image SEO Report ## Image 1: unnamed-1 - Alt: (missing) Issues: - Alt text is missing. Every meaningful image should have descriptive alt text for accessibility and SEO.
Alt text describes images for screen readers and when images fail to load. Search engines use it to understand image content. Use concise, descriptive alt (under ~125 characters) that reflects the image and context. Avoid 'image of' or 'picture of'—describe the content directly.
Use lowercase, hyphen-separated, descriptive names (e.g. blue-widget-hero.png). Avoid spaces and underscores. Keep names reasonably short and keyword-relevant. This helps SEO and avoids URL encoding issues.
Above-the-fold images should ideally be under ~200 KB after compression. Large images (e.g. 500 KB+) can hurt page speed and Core Web Vitals. Use our Image Compressor or Image Resizer to optimize before upload.