Free · No signup · Runs in your browser

Free HTML5 Banner Ad Validator

Drop in your HTML5 ad ZIP and check it against Campaign Manager 360 specs in seconds — clickTag, file weight, animation length and borders — with a live, replayable preview. Catch the issues before trafficking does.

Launch the validator How it works
Your files never leave your browser — safe for unreleased campaigns.
What it checks

The things that get ads rejected.

clickTag

Confirms the exit/clickTag is present and set up the way ad servers expect.

File weight

Flags total ZIP and initial-load weight against standard size budgets.

Animation length

Checks the animation duration against platform limits so loops don't get rejected.

Borders & more

Border requirements and other common CM360 checks, with clear warnings.

How it works

Three steps, about ten seconds.

1

Upload your ZIP

Drag in the HTML5 banner ZIP. Nothing uploads to a server — it's parsed locally in your browser.

2

Read the report

Get an instant pass/fail with warnings for clickTag, weight, animation length and borders.

3

Preview & fix

Watch the ad in a live preview with replay/pause, fix what's flagged, and re-check.

Why use it

Built by people who traffic ads all day.

Private by design

Validation runs entirely in-browser. Your creative never leaves your machine.

See it run

A live preview with timer and replay, so you catch visual issues a spec check can't.

Real production knowledge

From a studio that builds 1,000+ trafficking-ready units a month for agencies.

Prefer it built right the first time?

We build trafficking-ready HTML5 banners for agencies.

Skip the validate-fix-revalidate loop. Send us the design and get DV360/CM360-ready units, white-label, with a free first sample.

DV360 banner production
FAQ

Quick answers.

Is the HTML5 ad validator really free?
Yes — it's free to use with no signup. Upload your HTML5 banner ZIP and get an instant pass/fail report plus a live preview.
Do my files get uploaded to a server?
No. The validation runs entirely in your browser — your creative never leaves your machine, so it's safe for unreleased campaigns.
What does it check?
It validates your HTML5 ad against Campaign Manager 360 (CM360) requirements: clickTag setup, file size/weight, animation length, borders and more — and shows warnings alongside a replayable live preview.
Which ad platforms does it cover?
It checks against CM360/DV360-style specs, which align closely with what most major ad servers (Celtra, Adform, Flashtalking) expect for standard HTML5 display units.
Can you just build or fix the ad for me?
Yes — that's our day job. We produce trafficking-ready HTML5 banners for agencies. See DV360 banner production or send us a brief for a free sample build.

Validate your ad now — free.

No signup, no upload, no catch. Check your HTML5 banner against CM360 specs in seconds, or hand the build to us.

Launch the validator Get a free sample build