Creative QA · Private by design

HTML5 Banner Checker & Validator for Google Ads

Drop one creative or a full campaign batch. Check platform limits, clickTag, ad.size, assets and live rendering without uploading client files.

600 KB / 40-file Google Ads rules Batch preview CSV QA report

Validate for:

Drop your banners here

HTML5 ZIP · PNG · JPG · GIF, drop one or many
100% private, processed in your browser

What the HTML5 banner validator checks

Pre-trafficking quality checks for Google Ads, Campaign Manager 360 (CM360), and DV360. Rules below were verified against official Google documentation on August 26, 2026.

Drop HTML5 ZIP or GIF

Drag single or batch ZIP, GIF, JPG, or PNG files. The tool extracts and analyzes creatives locally.

Automated QC Analysis

Validates clickTag variables, platform specific ZIP and file-count limits, IAB format, external assets, and GIF behavior.

Interactive Live Preview

Test animations inside sandboxed iframes, verify fallback backup images, and inspect asset weights.

Current Uploaded HTML5 Ad Limits (verified August 2026)

View Complete Specs Matrix →

Google Ads · 600 KB ZIP · 40 files Google Ads · ad.size required CM360 · 9.5 MB · 100 files CM360 · at least one clickTag Backup image · recommended, not a hard requirement

Official sources: Google Ads uploaded display specifications · CM360 display creative asset options

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Frequently Asked Questions

View All 15+ Questions & Troubleshooting →

What is a clickTag in HTML5 banners and why is it required by ad servers? ▼

A clickTag is a JavaScript variable that ad servers inject at runtime to control where the banner links when clicked. Instead of hardcoding a destination URL inside the creative, the trafficking platform (Google Ads, CM360, DV360, Xandr) manages destination URLs dynamically. Without clickTag, the ad server cannot track clicks or redirect users.

Is 150 KB still the HTML5 ZIP limit for Google Ads and CM360? ▼

No. Google Ads currently accepts uploaded HTML5 ZIP files up to 600 KB and no more than 40 files. CM360 display creatives can be up to 9.5 MB with up to 100 files; creatives above 150 KB use polite loading. Keeping the initial payload near 150 KB is still a sensible performance target, but it is not the current Google Ads upload ceiling.

Is my banner creative uploaded to any server during validation? ▼

No. All ZIP parsing (via JSZip), GIF frame decoding, and HTML sandboxing occur 100% inside your local web browser. No files are ever sent to any remote server, ensuring full compliance with agency NDAs and client confidentiality requirements.

Browse All FAQs & Help Guides →

Popular HTML5 Banner & Ad Ops Guides

How to Fix Missing clickTag Error Step by step guide to declaring clickTag in HTML, Adobe Animate, & GWD. Google Ads HTML5 ZIP Specifications Complete technical specs, file size caps, and asset rules for Google Ads. Standard IAB Display Ad Dimensions Visual guide to 300×250, 728×90, 160×600, and top mobile banner sizes. Ad Ops Banner QC Checklist Comprehensive pretrafficking quality check list for media buyers.