MEDIUM RECTANGLE 300X250:

Best Practices: 

Medium Rectangle - 300x250

Ad must have a strong background color or border.

Animation cannot be longer than 15 seconds including looping.

Animation frame rate must have a minimum of 15 frames per second and maximum of 30 fps

Audio must be user initiated.

Less is more.  If you give the reader too much info, there’s no reason to click. 

Always include a call to action.

Never, ever make an image larger.  This blurs the image, logo, graphic.

Never change an advertiser’s logo in any way.

Stay away from gradients, drop shadows, stroked text, embossed text, etc.  These raise the file size and reduce the readability of the ad.

Check the advertiser’s website for design style, colors, etc.