Medium Rectangle

The Medium Rectangle ad is a 300x250 ad unit and is a component of the IAB's Universal Ad Package. Northstar features these ad units throughout every publication alongside our editorial content. 

Template:Click here to download this template or save the image below.

Medium Rectangle 300 x 250 gen


Submission Lead-Time: Creative files and click-through URLs must be submitted to Northstar no later than 5 business days prior to launch. HTML5 submissions are due 10 business days prior to launch.

Creative Unit Name
IAB Standard
width x height
File Types
File Size Limit
Static Image Medium Rectangle300x250.gif, .jpg, .png60 KB max initial load
HTML 5 Medium Rectangle300x250HTML 5200 KB max initial load
Expandable Medium Rectangle300x250 expands to 600x500HTML5HTML5: 200 KB max initial load;
300 KB subload


Animation: Allowed for this unit.
  • 15s max - 3 loops max
Expansion: Allowed for this unit. See more at Expandable Ad Specs.
A copy of our HTML5 expandable template is available for download here.
  • Expansion Direction: Left
  • Expansion Method - Expand: On Click
  • Expansion Method - Close: On Mouse-Off or On Click
  • Expansion Controls on Edge - Replay, Close X
Video & Audio: Allowed for this unit.
  • Image and Video combined cannot exceed 1 MB in total file size.
  • Audio Starts with Video after User Initiation
  • Video: Minimum 24fps. Resolution 240x180 or greater.
  • Preferred file formats: *.mpg, *.avi, *.flv, *.mov and *.mp4.
  • Length: 15 seconds maximum
  • Video Controls: Play, Pause, Rewind, Volume.
  • Controls on Edge - Replay, Close X

    3rd Party Hosted Required for HTML5 units not being built by Northstar. See General Guidelines for additional information. Northstar will not provide video metrics on 3rd party hosted creative.