Why is 300x250 the most booked banner size?

Inventory. Nearly every publisher reserves the slot, it works in the sidebar and inline in copy, and it is one of the very few sizes that serves on both desktop and mobile. If you only build one banner, build this one.

Is a single 300x250 enough for a campaign?

Enough to test, not enough to scale. With one size you forfeit every placement that demands different dimensions. In practice you pair it with 728x90, 160x600 and a mobile size to cover the bulk of available inventory.

Which file format and file size?

myfeedr delivers 300×250 as PNG (lossless) and JPG. For trafficking, the JPG is what counts: around 60 KB is a realistic target for this size – small enough for any network without visible quality loss.

What does the format cost?

Formats are not sold individually — :size is part of the "Starter" package from 79 €. Analysing your website is free.

300×250 banner (Medium Rectangle)

Where is the 300×250 format used?

The medium rectangle sits inline within article copy or in the right-hand sidebar. It is the one standard size that serves on desktop and inside the mobile content stream alike.

Example banner in 300×250, generated automatically with myfeedr — Real example in 300×250 – generated automatically from a website (preview may be scaled).

How much copy fits into 300×250?

Headline (recommended)	40 characters
Subline useful	✓
Product image useful	✓
Target file size	≤ 60 KB (JPG)

Headline, short subline and button all fit, but only if the image leaves room instead of filling the frame.

Related sizes

→When you need a little more room for copy or a product shot: 336×280
→The sidebar upgrade with double the height and far more presence: 300×600
→For slots that cannot take 250 pixels of width or are built square: 250×250

Design tips for 300×250

✓Advertiser first: the logo or wordmark must be recognisable in under a second.
✓One message per design — headline, optional subline, one button.
✓Contrast over taste: text at least 4.5:1 against the background.

More Display / Affiliate formats

FORMAT	SIZE	USE
Leaderboard	728×90	IAB
Large Rectangle	336×280	IAB
Wide Skyscraper	160×600	IAB
Skyscraper	120×600	IAB
Half Page	300×600	IAB
Mobile Banner	320×50	IAB
Large Mobile Banner	320×100	IAB
Full Banner	468×60	IAB
Super Leaderboard	970×90	IAB
Billboard	970×250	IAB
Square	250×250	IAB
Small Square	200×200	IAB
Panorama	980×120	DACH
Wallpaper Top	800×250	DACH

Frequently asked questions

Why is 300x250 the most booked banner size?: Inventory. Nearly every publisher reserves the slot, it works in the sidebar and inline in copy, and it is one of the very few sizes that serves on both desktop and mobile. If you only build one banner, build this one.
Is a single 300x250 enough for a campaign?: Enough to test, not enough to scale. With one size you forfeit every placement that demands different dimensions. In practice you pair it with 728x90, 160x600 and a mobile size to cover the bulk of available inventory.
Which file format and file size?: myfeedr delivers 300×250 as PNG (lossless) and JPG. For trafficking, the JPG is what counts: around 60 KB is a realistic target for this size – small enough for any network without visible quality loss.
What does the format cost?: Formats are not sold individually — :size is part of the "Starter" package from 79 €. Analysing your website is free.

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300×250 Medium Rectangle