What is a video validator?

A video validator is a tool that helps you ensure your video ads meet industry standards and function correctly across different platforms.

Why is video ad validation important?

Validating your video ads ensures they comply with IAB standards, deliver a seamless user experience, and perform reliably across various environments.

What aspects of a video ad does the validator check?

The video validator checks various aspects such as file format, size, resolution, codec, bitrate, frame rate, and other important properties that affect video quality and performance.

How can I use the video validator?

You can use the video validator by providing a URL to the video. The tool will analyze the video and provide detailed results and recommendations.

Video File Size test Validation

Test File Size for compliance and performance issues.

How to test a video ad media file assets for compliance and performance issues.

Enter your video URL below to start the validation

How to test video ad media assets

Testing profile - Video File Size test

VAST In-Stream Video Test Display Ads Video Test

What we test for

When you run a test in our Video Validator, we check your video file for the following common properties and best practices of video ad creatives:

Video File Size Test

Video File Size test analysis describes the size of the video file in a human-readable format. The video file size is an important factor for ad delivery and user experience. Your video file size should be optimized to balance quality and loading times and sit within a minimum size of 500.00 KB and a maximum size of 2.00 MB for display ads and up to 10.00 MB for VAST video ads.

Video File Size test Profile Test video file size to ensure it meets industry standards and delivers optimal performance across platforms.There is no single IAB VAST file size standard; instead, the Interactive Advertising Bureau recommends providing multiple video files to optimize ad delivery for different connection speeds. The latest VAST 4.x specification emphasizes supplying low, medium, and high-quality options, as well as a "mezzanine" file, rather than enforcing a single file size limit.

Why validate video ads

Video ads don’t just need to play — they need to meet industry standards, deliver a seamless user experience, and perform reliably across every environment. Validating your video ads ensures compliance with IAB specifications such as VAST, OMID, and SIMID, which define how ads should load, track, and interact with players. When these standards aren’t met, ads can fail to render correctly, misreport impressions, or break entirely in certain placements.

A key reason to validate is to prevent issues flagged by Heavy Ad Intervention (HAI) — Google Chrome’s system that automatically unloads ads consuming excessive CPU, network, or memory resources. Heavy ads not only waste media spend but also degrade page performance and user trust. By validating your creatives, you can identify oversized files, inefficient scripts, and playback errors before they reach the end user.

Ultimately, video ad validation protects both your ad performance and your audience’s experience. Valid ads load quickly, respect device resources, and track properly — leading to better completion rates, accurate analytics, and higher engagement. It’s the difference between a flawless, standards-compliant ad and one that disrupts the viewer, drains resources, or gets blocked entirely.

Looking to validate your VAST tags?

Once your video file is validated, take the next step with our VAST Tag Tester It helps you understand how your ad behaves in real-world VAST players — verifying tracking events, error responses, wrapper chains for true IAB compliance and much more. Learn by our VAST examples on how to structure and optimize your VAST tags for maximum ad performance.