Image URL Checker: Common Mistakes and Best Practices

Most problems with image URL Checker aren't caused by not knowing what to do — they're caused by small, easy-to-miss mistakes that compound quietly over time. Here are the ones that come up most often.

Mistake 1: Leaving `alt=""` on meaningful images purely out of habit — empty alt text should be reserved for genuinely decorative images only.

Mistake 2: Not checking image URLs on paginated or filtered category pages, where broken thumbnails are easy to miss during a manual review.

Mistake 3: Relying on a CDN indefinitely without a fallback — if the CDN goes down, every image on the site does too.

The fix for most of these isn't more effort, it's a regular check. A few habits that prevent them from creeping back in:
- Serve images over HTTPS on an HTTPS page — mixed content warnings from HTTP images can block rendering in some browsers.
- Compress and lazy-load below-the-fold images; broken links aside, oversized images are still one of the top page-speed issues on the web.

Worth reading alongside this: our guide to keyword density, which covers the adjacent side of the same part of a technical SEO audit.

Image URL Checker catches most of this automatically, which is the easiest way to stop these mistakes from shipping in the first place.

Everything in this guide runs directly in your browser — no signup, no install.