HTML5 Validator: Check Your Banner Ads Instantly
Our HTML5 Validator makes it easy to verify that your banner packages meet platform requirements like Google Display Network (GDN) and DV360. Just upload your ZIP file and the tool will scan it right in your browser — checking file size, asset inventory, code references, and external calls. You’ll know right away if your banner is compliant or if it needs adjustments before trafficking.
Built for designers and developers, this tool saves you from long rounds of back-and-forth by catching common issues early. It also helps track down hidden dependencies like unapproved scripts or oversized images. Everything runs locally, so your files remain private while you validate.
Tips for Validating Banners
- Start with the right profile: choose Google Display Network, DV360, or custom limits based on where your ad will run.
- Watch the file size: most networks cap ZIPs at 150 KB — use compressed images and optimized code.
- Check external domains: whitelist only trusted CDNs like Google Fonts; block everything else.
- Review the asset inventory: large or unused files can quickly push you over the limit.
- Export your results as JSON or Markdown for documentation or client approvals.
Note: Always confirm with your ad network’s official specifications before launch, since requirements may change over time.