Tumblr Blog Header Resizer

What matters

Tumblr Blog Header dimensions at a glance

Tumblr blog headers vary by theme, but 3000×1055 works well for most built-in and popular custom themes. The large size ensures sharpness on high-DPI screens.

Blog customization is central to Tumblr culture. A well-sized header sets the tone for the entire blog and is often the first thing visitors notice.

Undersized headers look pixelated on retina screens. Wrong ratios get cropped differently depending on the active theme, creating unpredictable results.

Best practices

Use the crop intentionally

• Check your specific theme's recommended dimensions — they vary significantly.
• Keep important content centered since different themes crop differently.
• Test on both desktop and mobile as Tumblr themes often have separate mobile views.