Free to use · No signup · Runs in your browser

Free HTML5 Ad ZIP Optimizer

Drop in your packaged HTML5 ad ZIP and shrink it in seconds — recompress the images, minify the HTML/CSS/JS, strip junk files, and check the result against Google Ads, CM360 and DV360 weight limits. Lighter ZIP, same ad.

Launch the optimizer How it works
Ad-safe and 100% in-browser — clickTag is preserved and nothing is uploaded.
What it does

Four passes to a lighter ZIP.

Recompress images

Re-encodes the JPG, PNG, GIF and WebP assets in the package to shed weight without re-exporting from scratch.

Minify code

Strips whitespace and comments from the HTML, CSS and JavaScript so the markup loads leaner.

Strip junk files

Removes the cruft that bloats a ZIP — .DS_Store, __MACOSX folders and stray editor files — that ad servers don't need.

Check the limits

Measures the repacked ZIP against Google Ads, CM360 and DV360 initial-load budgets so you know it'll pass.

How it works

Drop it in, download it lighter.

1

Upload your ZIP

Drag in the packaged HTML5 banner ZIP. It's unpacked and processed locally in your browser — nothing uploads to a server.

2

It optimizes & checks

Images are recompressed, code is minified, junk is stripped, and the result is checked against Google Ads / CM360 / DV360 weight limits.

3

Download the result

Grab the lighter ZIP and traffic it. If any step errors, it falls back to your original file so a working ad is never broken.

Why use it

Optimizes the ad without breaking it.

Ad-safe by design

It reserves clickTag, Enabler and Adobe Animate runtime references rather than touching them, so the exit and animation keep working.

Private by design

Unzip, optimize and repack all happen in-browser. Your creative never leaves your machine — safe for unreleased campaigns.

Real production knowledge

From a studio that builds and ships trafficking-ready HTML5 units to spec for agencies every day.

Already validating your build?

Pair it with our free HTML5 QA tool.

This optimizer trims weight; for a full CM360 spec check — clickTag, animation length, borders, missing assets — run the optimized ZIP through our QA tool before you traffic it.

QA HTML5
Prefer it built light the first time?

We build weight-optimized HTML5 banners for agencies.

Skip the optimize-and-recheck loop. Send us the design and get DV360/CM360-ready units, built under budget, white-label, with a free first sample.

DV360 banner production
FAQ

Quick answers.

Is the HTML5 ZIP optimizer really free?
Yes — it's free to use with no signup. Drop in your HTML5 ad ZIP, it optimizes everything in your browser, and you download the lighter ZIP back. There's no paywall on the output and nothing is uploaded.
Do my files get uploaded to a server?
No. The whole thing — unzipping, recompressing images, minifying code, repacking — runs entirely in your browser. Your creative never leaves your machine, so it's safe for unreleased campaigns.
Will optimizing break a working ad?
It's built to be ad-safe. The optimizer reserves clickTag, Enabler and Adobe Animate runtime references rather than touching them, and if any step throws an error it falls back to the original file untouched — so it won't quietly break an ad that already works. We still recommend re-checking the result in our HTML5 QA tool before trafficking.
What exactly does it do to the ZIP?
Four things: it recompresses the images (JPG/PNG/GIF/WebP) to shed weight, minifies the HTML, CSS and JavaScript, strips junk files (things like .DS_Store, __MACOSX and editor cruft that bloat the package), and then checks the repacked result against Google Ads, CM360 and DV360 initial-load weight limits so you know if it'll pass.
Which weight limits does it check against?
It checks the optimized package against the common Google Ads / Campaign Manager 360 / DV360 initial-load budgets for standard HTML5 display units, and tells you where you stand against each so a heavy ad doesn't get bounced at upload.
Can you just build or fix the ad for me?
Yes — that's our day job. We produce trafficking-ready HTML5 banners for agencies, weight-optimized and QA'd to spec. See DV360 banner production or send us a brief for a free sample build.

Optimize your ad ZIP now — free.

Free to use with no signup, nothing uploaded. Recompress the images, minify the code, strip the junk, and check the result against Google Ads, CM360 and DV360 weight limits — all in your browser. Or hand the build to us.

Launch the optimizer Get a free sample build