Drop one creative or a full campaign batch. Check platform limits, clickTag, ad.size, assets and live rendering without uploading client files.
Google Ads rules: 600 KB, 40 filesBatch previewCSV QA report
Validate for:
Drop your banners here
HTML5 ZIP · PNG · JPG · GIF, drop one or many 100% private, processed in your browser
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What the HTML5 banner validator checks
Quality checks before trafficking for Google Ads, Campaign Manager 360 (CM360), and DV360. Rules below were verified against official Google documentation on September 27, 2026.
1
Drop HTML5 ZIP or GIF
Drag single or batch ZIP, GIF, JPG, or PNG files. The tool extracts and analyzes creatives locally.
2
Automated QC Analysis
Validates clickTag variables, platform specific ZIP size and file count limits, file types, IAB format, external assets, and GIF timing.
3
Interactive Live Preview
Test animations inside sandboxed iframes, verify fallback backup images, and inspect asset weights.
Current Uploaded HTML5 Ad Limits (verified September 2026)
Google Ads · 600 KB ZIP · 40 filesGoogle Ads · ad.size requiredGoogle Ads · GIF slower than 5 FPS, stops by 30 sCM360 · 9.5 MB · 100 filesCM360 · clickTag or Google Web Designer exitGoogle Ads · no clickTag neededDV360 · 5 MB served · 100 filesBackup image · recommended, not a hard requirement
How the HTML5 banner validator applies each platform's rules
Pick the platform before you drop a ZIP, because Google Ads, Campaign Manager 360 and Display & Video 360 disagree on weight, file types, exits and storage. Every rule below is what this tool actually checks, taken from each platform's help center and verified in September 2026. Everything runs in your browser: the files are never uploaded.
Google Ads
The ZIP must stay at or under 600 KB and hold no more than 40 files, all of them HTML, CSS, JS, GIF, PNG, JPG or SVG.
An ad.size meta tag is required, and it is compared with the size your CSS or canvas really uses.
External references are limited to Google Fonts and the Google hosted CreateJS, GreenSock and jQuery builds.
No clickTag is required: Google Ads makes the whole ad clickable. A miscased clickTAG is still flagged, and ExitApi is rejected.
localStorage, sessionStorage and other storage APIs are an error. Animated GIFs must run slower than 5 FPS and stop within 30 seconds.
Campaign Manager 360
Up to 9.5 MB and 100 files, including JSON, XML and web fonts. ad.size is recommended, not required.
Every creative needs an exit: var clickTag in the primary HTML file for hand coded work, numbered click tags for multiple exits, or a Google Web Designer exit (Enabler.js from s0.2mdn.net with Enabler.exit, or a Tap Area exit).
CM360 does not accept HTML5 assets that use local storage or session storage, so both are errors here.
A backup image above 40 KB is too heavy to double as a polite load image.
Display & Video 360
DV360 sets no ZIP ceiling but caps what a browser downloads for one ad at 5 MB, so the tool adds up the unpacked files. The limit is 100 files.
A clickTag or a Studio exit (Enabler.exit) is required. Animation must stop after 30 seconds.
DV360 publishes no storage rule, so storage use is a warning rather than an error.
How this compares with Google's HTML5 Validator
Google's own HTML5 Validator is the reference for what Google's systems accept, and it is worth a final pass before a Google Ads upload. It works by uploading the ZIP to Google. AdCheckLab reads the ZIP locally, so client work never leaves your machine, and it checks a whole batch at once with the rules of the platform you choose. It adds checks the Google tool does not focus on: clickTag declaration and casing, the allowed CDN hosts per platform, GIF length and frame rate, and served weight. Neither tool replaces the ad server's own review.
No. Google Ads makes the whole uploaded HTML5 ad clickable and sends clicks to the final URL you set in the ad. Add a clickTag only if the same creative is also trafficked in CM360 or DV360.
Is my banner uploaded anywhere during the check?
No. ZIP parsing, GIF decoding, the live preview and every export happen inside your browser. Nothing is sent to a server.
What are the current Google Ads HTML5 limits?
A ZIP of 600 KB or less with at most 40 files, an ad.size meta tag, no external files beyond Google Fonts and Google hosted libraries, and animation that stops within 30 seconds.
Why does CM360 reject a banner that uses localStorage?
Campaign Manager 360 does not accept HTML5 assets that use local storage or session storage, because stored data can be used to capture personal information. Keep state in plain JavaScript variables.
Can I create a backup image here?
Yes, for canvas banners from Adobe Animate or CreateJS: the tool captures the stage and saves a JPG under 150 KB and a PNG. Banners built from HTML elements cannot be captured exactly in a browser, so record the preview or take a screenshot at 100% zoom.
Can I send the results to a client?
Download the PDF report or the CSV for free. With Pro you can remove the AdCheckLab mark, add your agency logo and export a client preview page that plays every banner offline.
