Appspot
h5validator.appspot.com › dcm
HTML5 Validator
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Ad Tag Validation
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Asset
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AdValify
advalify.io
HTML5 Ad Validator | Free Online Ad Testing Tool
Check 42+ ad quality tests for ad performance — validate against IAB and Google HTML5 ad guidelines
Google's old HTML5 Validator finally stopped working
I was testing it a few weeks ago and it still seemed to work for me, even though the tool is deprecated. Are you sure it’s not just an issue with that particular file you were working with? More on reddit.com
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August 25, 2025HTML5 Ad Validation (initial load, CPU, size, etc) - Banner Animation - GSAP
Hi everyone, I wanted to share something with you that I think could be super useful. I've created a tool called AdValify.io — a free platform where you can benchmark your HTML5 ads for performance and validate them against IAB ad specifications. It checks important things like load speed, ... More on gsap.com
HTML5 Validator
Google is baking it in to cm on the advertising side and bet they will have something similar on the studio side. It was supposed to roll out end of last year I’ll see if I can find an update.
More on reddit.com 11
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February 15, 2019Help prevent Google/DoubleClick HTML5 Validator from being depreciated - Banner Animation - GSAP
Hi all, Google's HTML5 validator is being depreciated in March 2021. I encourage you to fill out the feedback from on the top right of that page, or directly here to advocate against its depreciation. Thanks! Most of us know this is a great tool for banner validation and if you don't know about i... More on gsap.com
What is an HTML5 ad?
HTML5 ads are similar to HTML ad tags, but they come packaged as a zip file that includes all of the assets needed for the ad. Unlike VAST video tags, HTML5 ads can include interactive elements and animations.They are often visually appealing, highly animated, and interactive ads. HTML5 ads can also range in size to support desktop and mobile web. · Just like third-party HTML ad tags, HTML5 ads often have poor load performance because they contain fetch multiple files from different places, so it's crucial to test your HTML5 ads and optimize their files.
previewads.com
previewads.com › html5-ad-tester
HTML5 Ad Validator & Tester - Powered by Ad Reform
How do I preview an HTML5 ad?
Preview an HTML5 ad by uploading an HTML5 zip file · View a live ad preview, images of each frame, and a video of the ad · View network timelines, load times, file sizes, and more to ensure ads are compliant · Share with clients and get feedback
previewads.com
previewads.com › html5-ad-tester
HTML5 Ad Validator & Tester - Powered by Ad Reform
Which browsers support HTML5 ads?
HTML5 ads are supported by all modern browsers including: · Chrome 60+ (desktop and mobile) · Safari 12+ (desktop and mobile) · Firefox 70+ (desktop and mobile) · Edge 79+ (desktop and mobile) · Samsung Internet 10+ · Opera 50+ · However, specific HTML5 features like WebGL, advanced animations, or audio may have different support levels. Our validator tests your ads across multiple browser environments to ensure compatibility.
previewads.com
previewads.com › html5-ad-tester
HTML5 Ad Validator & Tester - Powered by Ad Reform
Videos
W3C
validator.w3.org
The W3C Markup Validation Service
This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available.
Google Support
support.google.com › webdesigner › answer › 7375764
The Ad Validator - Google Web Designer Help
The Ad Validator in Google Web Designer checks your ad for common issues and displays the results in a panel, along with basic information such as the ad environment, the total size of the ad if it were to be published, and its initial load size.
IAB
iab.com › home › news › iab tech lab releases html5 ad validator, one-stop resource for testing mobile & desktop ads against iab display ad creative guidelines
IAB Tech Lab Releases HTML5 Ad Validator, One-Stop Resource For Testing Mobile & Desktop Ads Against IAB Display Ad Creative Guidelines
January 26, 2021 - NEW YORK, NY (April 11, 2016) – The IAB Technology Laboratory released its HTML5 Ad Validator, a first-of-its-kind online tool that allows for quick and easy testing of mobile and desktop ad creative against the IAB Display Creative Guidelines.
Reddit
reddit.com › r/adops › google's old html5 validator finally stopped working
r/adops on Reddit: Google's old HTML5 Validator finally stopped working
August 25, 2025 -
We are seeing file errors on upload for the first time ever since it was announced at least a year ago that the tool was being deprecated (I never understood why Google doesn't like it, except they want revenue).
Seeing as this tool is no longer maintained, could this be the end of the free H5 vaildator for AdOps and Creators? Are there other free HTML5 validators out there that work as good?
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I was testing it a few weeks ago and it still seemed to work for me, even though the tool is deprecated. Are you sure it’s not just an issue with that particular file you were working with?
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I'm in the middle of creating one here for free use https://admein.io I'll update once I have it live.
Ad Reform
blog.adreform.com › using-a-html5-validator-for-flawless-ad-creatives
Using a HTML5 Validator For Flawless Ad Creatives
October 9, 2025 - Learn to use a HTML5 Validator to quickly improve ad creative quality. This guide provides actionable steps for seamless QA and better campaign performance.
AdMeIn
admein.io
AdMeIn – VAST Tags, HTML5 Banner Ad & Video MP4 Ad Validator
AdMeIn offers a suite of tools for testing and validating your digital advertising creatives. Our Ad validators allow you to preview VAST, HTML5, Video and Display ads, helping you catch errors before they go live.
GreenSock
gsap.com › forums › banner animation
HTML5 Ad Validation (initial load, CPU, size, etc) - Banner Animation - GSAP
January 9, 2025 - Hi everyone, I wanted to share something with you that I think could be super useful. I've created a tool called AdValify.io — a free platform where you can benchmark your HTML5 ads for performance and validate them against IAB ad specifications. It checks important things like load speed, initia...
Previewads
previewads.com › html5-ad-tester
HTML5 Ad Validator & Tester - Powered by Ad Reform
Test and validate HTML5 ads for Campaign Manager (CM360) acceptance. Upload HTML5 zip files, view live previews, check load times, file sizes, and network timelines. Free HTML5 ad validator and testing tool.
Reddit
reddit.com › r/adops › html5 validator
r/adops on Reddit: HTML5 Validator
February 15, 2019 -
Google DCM HTML5 Validator will be deprecated without a replacement March '21..
Our studio relies on this to make sure creatives will not be rejected when uploaded to DCM. Anyone know of any alternatives? Thanks!
EDIT: Nevermind! deprecation postponed, thanks to anyone who raised concerns..
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Google is baking it in to cm on the advertising side and bet they will have something similar on the studio side. It was supposed to roll out end of last year I’ll see if I can find an update.
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What the fuuuxck ...
Edit: possible they are porting this over to the platforms instead of being stand alone but still checking
Adobe
community.adobe.com › t5 › animate-discussions › ad-validation-checks-on-html5-creatives › m-p › 12859857
Ad validation checks on HTML5 creatives | Community
April 5, 2022 - Hi everyone. My name is Roy and I've built an ad validation tool called AdValify.io. I'm here on this forum to seek for suggestions and discuss how HTML5 creative designers like you handle the ad validation part. I've already made a checklist for the most common checks on HTML5 ads. See he...
PPC Land
ppc.land › html5-validator-tool-for-campaign-manager-to-be-deprecated-in-april-2025-2
HTML5 validator tool for Campaign Manager to be deprecated in April 2025
January 27, 2025 - The tool performs three critical functions: it allows users to upload html5 creatives in zip format, reviews validation results to determine acceptance by Campaign Manager, and provides detailed error messages for troubleshooting issues. Bradley Lancaster, a member of the advertising operations community who identified himself as working with Google Partners, shared insights about potential alternatives: "The functionality will exist in Campaign Manager 360 / Display & Video 360.
GreenSock
gsap.com › forums › banner animation
Help prevent Google/DoubleClick HTML5 Validator from being depreciated - Banner Animation - GSAP
January 17, 2025 - Hi all, Google's HTML5 validator is being depreciated in March 2021. I encourage you to fill out the feedback from on the top right of that page, or directly here to advocate against its depreciation. Thanks! Most of us know this is a great tool for banner validation and if you don't know about i...
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Hi Marley, This is Roy, the developer of the HTML5 ad validator tool that you've used. I re-ran your creative through the scanner, and this is what I've found:https://www.advalify.io/html5-ad-validator/s8e9w-ce605-8e49d Your creative is not rendered due to a JavaScript error "Cannot read property 'getContext' of undefined at a.b._parseData". Furthermore, your image returns a 404 because you've used a capital in your link. The image is in the folder "Images", while you're linking to "/images/..." (with a lowercase i). The server therefore returns a 404. See here: If you need further help, feel free to contact me
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the validator is not "seeing" your images content (or your images folder).
Reddit
reddit.com › r/adops › html5 creative validation tools
r/adops on Reddit: HTML5 Creative Validation Tools
January 9, 2021 -
Hey all! Wondering what your thoughts are on ad validation. Reason being is because we are evaluating our current process and determining if we can do this faster.
We currently request our graphic design team (external agency) to send us all the files in a folder in a GWD format (includes json files). Then we have to import that into Google Web Designer, so that we can use the built in ad validator, and then publish and connect to Campaign Manager. This process can become quite tedious because we have to do these 1 by 1 and also connect backup creatives. So the process of open + validation + backup image + publishing creative & connecting to CM, all that can take maybe 1-2 minutes per creative. When you're talking about 30-60 creatives, that's a lot of time.
The alternative we are considering is to instead use the standard zip file format for HTML5 files, then batch validate with a tool like h5validator.appspot.com, then batch upload the files into CM. Assuming the files pass validation, that same process might take 5-10 minutes at most for hundreds of creatives.
So, questions here:
Is the GWD built-in validator any different than a tool like h5validator? If so, how?
How necessary would you say the html5 validation is?
Do you have any other methods of efficiently validating and uploading HTML5 creatives into Campaign Manager?
Thanks for the input fellers!
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There’s a number of them out there. I found it a pain to do this and setting up campaigns in general so I created bycape.io a tool which fully automates trafficking. We built a microservice into it which auto validates all uploaded html5s and also auto generates defaults/ backup images. Check it out, will save you many hours per campaign.
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You probably want to look for a way to automate the creative QA process. Since h5validator.appspot.com is going to be deprecated, you can try this alternative: https://www.creativeqa.io/html5-ad-validator To automate, you can use the API: https://www.creativeqa.io/api-docs#scans_zip You still have to do some parts of the process manually, but you can at least automate the QA part of it.
Google Support
support.google.com › webdesigner › thread › 217602102 › html-5-banners-passed-the-validator-but-not-the-upload
Html 5 banners passed the Validator but not the upload - Google Web Designer Community
May 25, 2023 - Skip to main content · Google Web Designer Help · Sign in · Google Help · Help Center · Community · Google Web Designer · Terms of Service · Submit feedback · Send feedback on
Stack Overflow
stackoverflow.com › questions › 40899419 › how-does-doubleclick-html5-validator-know-the-dimensions-of-my-banner-ad
double click - How does DoubleClick HTML5 Validator know the dimensions of my banner ad? - Stack Overflow
I have a banner that is 160x600, but the HTML5 Validator is detecting it as 300x250. My body, and my container are set to a width: 160px and height: 600px · I'm not sure where else to look. Thanks in advance!
Validator
html5.validator.nu
Validator.nu (X)HTML5 Validator - Nu Html Checker
This tool is an ongoing experiment in better HTML checking, and its behavior remains subject to change · About this checker • Report an issue • Version: 22.3.8