Tumblr Image Sizes 2026: The Complete Guide

Getting Tumblr image sizes wrong means avatars that look pixelated, header banners that get cropped, or image posts that display at low quality. This guide covers every Tumblr image size you need in 2026 — avatars, header banners, image posts, photosets, and inline images.

Tumblr Image Sizes at a Glance

Format	Size (px)	Aspect Ratio	Notes
Avatar	128×128	1:1	Displayed as square; upload at 128×128 min
Header banner	3000×1055	~2.84:1	Displays at 1000×313 on desktop; keep content centred
Image post	1280×1920	2:3	Max display width 1280 px; height unlimited
Photoset image	1280×1280	1:1	Used in multi-image photoset layouts
Inline image	1280×800	16:10	Embedded within text posts

Avatar: Small but Always Present

Tumblr displays your avatar at small sizes across the dashboard, in search, and next to posts. Upload at 128×128 px minimum — larger is fine, Tumblr scales it down. The avatar displays as a square, so edge-to-edge designs work. Keep faces or logos centred for consistency across sizes.

Header Banner: Design Wide

The Tumblr header banner displays across the top of your blog. Upload at 3000×1055 px for maximum quality, but it renders at approximately 1000×313 px on desktop. The sides of your banner may be cropped on smaller screens, so keep all critical content — your blog name, tagline, or key visuals — in the central horizontal band.

Image Posts: Tall and Readable

Tumblr supports image posts up to 1280 px wide — this is the maximum display width. There is no maximum height limit, making Tumblr ideal for tall, vertical images and long-form infographics.

For best results, upload at 1280 px wide and let the height be dictated by your content. Images narrower than 1280 px will be displayed at their native width without upscaling.

Key tips for image posts:

Portrait orientation (taller than wide) performs best in the Tumblr dashboard feed

Add descriptive alt text — Tumblr supports alt text and it helps with accessibility

GIFs are a core Tumblr content type — max size is 10 MB per GIF

Photosets and Inline Images

Photosets: Multi-image grid layouts use 1280×1280 px square images. Tumblr automatically arranges them into rows.

Inline images: Images embedded within text posts display at up to 1280 px wide. Use 1280×800 px for a clean widescreen look inside text posts.

File Format and Compression Tips

Use JPG for photographs — good quality at manageable file sizes

Use PNG for graphics, text-heavy images, and illustrations

Use GIF for animated content — max 10 MB

Maximum image file size: 10 MB

Use sRGB colour profile for accurate colour rendering

How to Resize Images for Tumblr Using imresizer

Go to imresizer.com/resize-image-for-tumblr and select your format — Post, Header Banner, Avatar, Photoset, or Inline
Upload your image
The correct dimensions are applied automatically
Adjust the crop position if needed, then download

Everything runs in your browser — your image never leaves your device.

Key Takeaways

Upload your avatar at 128×128 px minimum and design your header banner at 3000×1055 px with key content in the central horizontal zone. For image posts, go up to 1280 px wide — Tumblr rewards tall, vertical content. Use the free tools below to resize without guesswork.