What size are IAB Standards Large Rectangle ads?

IAB Standards Large Rectangle ads are 336×280 pixels with an aspect ratio of 6:5.

What aspect ratio does IAB Standards Large Rectangle use?

IAB Standards Large Rectangle supports 6:5 aspect ratio.

What is the maximum file size for IAB Standards Large Rectangle?

Files for IAB Standards Large Rectangle can be up to 0.2 MB.

Which file formats does IAB Standards Large Rectangle accept?

IAB Standards Large Rectangle accepts JPG, PNG, GIF, and HTML files.

Where does IAB Standards Large Rectangle appear on IAB Standards?

IAB Standards Large Rectangle ads appear in the In-content / Sidebar placement on IAB Standards.

Where can I find the official IAB Standards Large Rectangle documentation?

The official source for IAB Standards Large Rectangle requirements is https://iabtechlab.com/standards/ad-portfolio/, linked from this page.

Are these IAB Standards Large Rectangle specs kept up to date?

Yes — every spec entry references IAB Standards's official documentation source so dimensions, file size limits, and codec requirements stay in sync as the platform changes.

Can I reuse the same creative for other IAB Standards placements?

Often partially — many IAB Standards placements share aspect ratios but differ in safe zones, duration, or file size. Always cross-check the target placement's spec page before reusing creative.

IAB Standards Large Rectangle ad specs

IAB Standards Large Rectangle ads are horizontal 6:5 still images, measured at 336×280 px, up to 0.2 MB per file, delivered as JPG, PNG, GIF, or HTML. They run in the In-content / Sidebar placement on IAB Standards. Use these requirements to brief designers, validate uploads, and avoid creative rejections in IAB Standards's ad manager.

Dimensions: 336×280 px
Aspect ratio: 6:5
Max file size: 0.2 MB

Visual specifications

Dimensions	336 × 280 px
Aspect ratios	6:5
Orientation	landscape
Max file size	0.2 MB
File types	JPG, PNG, GIF, HTML

Notes & source

Larger version of the Medium Rectangle providing increased creative space. Max initial load 200 KB.

Official source: https://iabtechlab.com/standards/ad-portfolio/

Frequently asked questions

What size are IAB Standards Large Rectangle ads?: IAB Standards Large Rectangle ads are 336×280 pixels with an aspect ratio of 6:5.
What aspect ratio does IAB Standards Large Rectangle use?: IAB Standards Large Rectangle supports 6:5 aspect ratio.
What is the maximum file size for IAB Standards Large Rectangle?: Files for IAB Standards Large Rectangle can be up to 0.2 MB.
Which file formats does IAB Standards Large Rectangle accept?: IAB Standards Large Rectangle accepts JPG, PNG, GIF, and HTML files.
Where does IAB Standards Large Rectangle appear on IAB Standards?: IAB Standards Large Rectangle ads appear in the In-content / Sidebar placement on IAB Standards.
Where can I find the official IAB Standards Large Rectangle documentation?: The official source for IAB Standards Large Rectangle requirements is https://iabtechlab.com/standards/ad-portfolio/, linked from this page.
Are these IAB Standards Large Rectangle specs kept up to date?: Yes — every spec entry references IAB Standards's official documentation source so dimensions, file size limits, and codec requirements stay in sync as the platform changes.
Can I reuse the same creative for other IAB Standards placements?: Often partially — many IAB Standards placements share aspect ratios but differ in safe zones, duration, or file size. Always cross-check the target placement's spec page before reusing creative.