Tumblr Header Size and Other Specs

With such accessibility also comes great versatility. So great, in fact, that at first glance it may seem hard to keep up with all the types of content and their perfect specs, so you don't mess up your post. But don't worry, it's actually not hard once you start using Tumblr. Let's take a look at all the sizes you should keep in mind before you make your first post.

What is Tumblr

In simple words, it's a good old social media platform with a twist: every user can modify their profile, which makes it possible for everyone to stand out. Plus, Tumblr is suitable for posting animated GIF sets, aesthetic boards, videos, and just about anything you can think of.

With this kind of versatility, it became a home for queer art and fandom communities. Here, people don't chase millions of likes, but value "mutuals" – regular blog friends with whom they enjoy interacting. This has led to Tumblr being the perfect platform for long, reflective posts with lots of paragraphs, ironic dialogues, or sincere stories from life. Here, it's easy to be yourself and not be afraid to seem weird.

But that doesn't mean it's too niche; Tumblr is user-friendly for anyone and everyone. You can easily find almost any topic thanks to the hashtag system, and archives let users quickly find certain posts.

Impressive, isn't it? It might already make you want to post something yourself, which means it's the perfect time to learn about the sizes of media files you can post.

Tumblr header image size

The header, also called banner image, works like a cover photo at the top of your blog page and is recommended to be 3000x1055 pixels (about 2.84:1 aspect ratio), but you can fiddle with it depending on the theme you're going for.

On mobile devices, Tumblr header images are typically shown at 640x360 pixels, and using the recommended dimensions is the ideal image size for a consistent blog appearance across devices because Tumblr automatically adjusts large images based on theme settings and device type.

Because the header can display differently on desktop, mobile, and different themes, it's best to treat Tumblr banners as the main top visual of the blog and:

• Keep key visuals and important text centered in the header image
• Avoid placing logos or text near the very top or bottom edges
• Remember that your profile picture (Tumblr avatar) sits over the bottom-center of the header, so leave that area clean

For best results, export your Tumblr banner image at 3000 × 1055 px, keep the file size under 10 MB, and use a supported format such as JPG/JPEG, PNG, or WEBP.

Tumblr avatar size

Your Tumblr avatar is displayed in many places across the platform as a small square at small sizes, so it's important to start with a clear, high-quality image.

• Recommended upload size: at least 128 × 128 pixels
• Display size in most places (like the dashboard): around 64 × 64 pixels
• Aspect ratio: 1:1 square (a square image is required)

To keep your profile photo looking crisp, upload a square image that's larger than 128 × 128 pixels and let Tumblr resize it automatically.

Tumblr post image size

For regular Tumblr image posts, a 2:3 aspect ratio works best in the dashboard feed.

• Recommended post image size: 540 × 810 pixels (2:3)
• Maximum width in lightbox view: up to about 2048 pixels wide

Tumblr scales images depending on how many you include in one post and where they appear. For example, image sets can show as smaller thumbnails like 245 × 245 or 177 × 177 pixels on the desktop dashboard before a user clicks to open them.

Supported and commonly used formats include JPG/JPEG and PNG. These are the best options for most Tumblr post images.

Tumblr post GIF size

GIFs are one of the most popular content types on Tumblr, but they're also more demanding in terms of size and performance.

• Recommended width: up to 540 pixels wide
• Height: any, but avoid extremely tall GIFs if possible
• File size: keep as small as possible for reliable playback (ideally just a few MB)

Tumblr can be strict with animated GIFs: very large files may fail to upload or won't animate properly. For best results with Tumblr GIF posts:

• Keep the width at 540 px or less
• Use efficient export settings (fewer frames, limited colors)
• Keep the file size as low as you can while maintaining quality

Horizontal GIFs usually look better in the dashboard view than narrow, vertical ones, and seamless loops perform especially well in the Tumblr feed.

Tumblr post video size

Yes, you can post videos on Tumblr – both by uploading your own clips and by embedding videos from platforms like YouTube or Vimeo.

Recommended Tumblr video settings for uploads:

• Aspect ratio: 16:9 (standard widescreen)
• Resolution: around 1280 × 720 pixels (HD)
• File size: up to 100 MB for a good balance between quality and fast loading; compressing clips first with a video compressor can make publishing much smoother
• Format: MP4 (H.264 video + AAC audio) is the most reliable choice

If you want to share longer or heavier videos, consider embedding them from YouTube or Vimeo. Embedded videos play directly in the Tumblr feed and don't count against Tumblr's upload size in the same way as native files.

Tumblr occasionally updates its specs, so if something doesn't upload, check Tumblr's current help docs at https://help.tumblr.com for the latest limits. And if you need to create a banner image of the right size, keep reading.

How to resize a video or image for Tumblr

Clideo's Resizer is a perfect tool for this task. You can resize all of the above in a matter of minutes, and the only thing you need is an Internet connection on your device! Whether you want to resize pictures on your iPhone or resize a video on your desktop, the process is very similar, so let's see how it goes when creating a header.

1. Upload an image

   Open Clideo's Resizer, then click "Choose file" to upload a picture from your device. If you have it on your cloud storage, hover over the arrow on the right side of the button to see the available options.

2. Resize the header

   We have a handful of ratio presets available, useful when you aim for a specific platform. But often it's best to set the dimensions freely, especially when you use pictures of uncommon sizes. To do it, select the "Custom" option, untick the chain icon between the text boxes, and then you can put specific values there to customize the header more precisely (for a Tumblr banner, let's start with 3000x1055) .

   Remember to maintain clarity and prevent cropping, as well as keep key visuals, important elements, and important text centered, since a custom theme may crop or resize the header differently in a mobile web browser and on a desktop.

   Below that, there are crop options that you can apply to your header. But depending on its dimensions, with the "Fill" option, the image may be cut off, while fitting it to the frame may lead to black sidebars appearing. Keep in mind that headers can display differently depending on the theme and the viewer's screen; the content placed near the edges is more likely to be cut off.

   Try to play around with these options to see which fits your header the best, if any. Zoom in and out, move the picture inside the frame, and also try changing or blurring the background color if you decide to leave black sidebars in.

   When you finish, click "Export" and wait for the result to process.

3. Save the header

   Once it's processed, you can see the final result and evaluate it, then export these graphics at full resolution – 3000 x 1055 pixels – to keep the header sharp on large displays and avoid automatic resizing. If something's wrong, you can go back by clicking "Edit". Otherwise, download the image to your device or cloud storage account, and once it's saved, it's ready to upload to your Tumblr page. And that's it – quite fast, isn't it?

   We regularly improve our tools to add new features or enhance your experience. Check our Help Center for the most recent instructions.

Tips and best practices for Tumblr posts

So, now you're ready to start your Tumblr blog, but you may not know a lot about this platform and its possible pitfalls. Here's what to expect and how to make your posts fit the Tumblr vibe.

1. Know the Tumblr vibe

   The most important thing to remember is that Tumblr is not Instagram or Twitter.

   In general, Tumblr's audience values authenticity, aesthetics, humor, and atmosphere. That means:

   • Hard-sell advertising and aggressive calls to action usually fall flat
   • Overly polished, "perfect" brand photos feel out of place
   • Super short, emotionless captions don't perform well
   
   

   Instead, Tumblr users gravitate toward:

   • Aesthetic collages and moodboards
   • Atmospheric GIF sets
   • Long personal reflections and storytime posts
   • Nostalgic memes and fandom content
   • Visual quotes and text posts with personality
   
   

   Be yourself, lean into your niche, and don't be afraid to be a bit weird – that's part of Tumblr's charm.

2. What performs best

   And if you're worried about your content, here are some general recommendations:

   Images

   • Use a 2:3 aspect ratio (for example, 540 × 810 px) so the image takes up more vertical space in the feed.
   • If you prefer squares, make sure borders and lines are straight so the image looks clean.
   • Avoid heavy watermarks if possible – on Tumblr, they're often seen as an "Instagrammer" sign and can turn people off.
   
   

   GIFs

   • GIFs are Tumblr's unofficial currency.
   • Make them loop smoothly without abrupt cuts.
   • Avoid over-saturated colors and overly busy edits – subtlety often looks better.
   • Aim for up to 540 px wide and keep the file size as small as possible for smooth playback.
   • Horizontal GIFs usually look better in the dashboard than very tall vertical ones.
   
   

   Videos

   • Short clips (around 2 minutes or less) tend to perform best.
   • Vertical or square formats work well for casual, phone-shot videos.
   • When sharing existing videos, it's often better to embed from YouTube or Vimeo so they play directly in the feed without leaving Tumblr.
   
   

   Text posts

   • Don't be afraid of long posts –Tumblr is one of the few platforms where people genuinely enjoy longreads.
   • Break text into clear paragraphs for readability.
   • Use bold and italics for emphasis instead of ALL CAPS.
   • Expect to see posts with chaotic caps and random keyboard smashing – that's just how some users show excitement, and it's part of the culture.
   
   

3. Use tags strategically

   Other stuff to think about is hashtags – they are a separate art form on Tumblr.

   • Tags work much better here than on many other platforms.
   • As a rule of thumb, the first five tags are the most important – Tumblr often uses them for recommendations.
   • Try not to use more than 10–15 tags per post, or it may look spammy.
   
   

   Use a mix of:

   • Niche tags: instead of just #art, add things like #darkacademia, #glitchart, etc.
   • Descriptive tags: #photography, #city, #rain to set the mood and broaden reach.
   
   

   A classic Tumblr trick: you can write entire side comments in the tags. People read them and react to them, and that style of "tag commentary" is basically a Tumblr trademark. Strategic tags can also help posts surface better in search results and give people easier access to older posts through Tumblr search and archives.

4. Post at the right time

   Tumblr has a global audience, but some time slots tend to get more activity.

   • Weekdays: 7–11 PM (New York time, UTC-5).
   • Weekends: 12–2 PM and 8–12 AM (New York time, UTC-5).
   
   

   Also, Tumblr's Radar and recommendation system can be unpredictable. A post might take off days or weeks later, while something new may not. If a post hasn't gotten traction after a couple of hours, don't rush to delete it – older posts can still resurface.

5. Focus on reblogs

   On Tumblr, reblogs matter more than likes.

   • A like is just a bookmark.
   • A reblog actually redistributes your post to someone else's followers.
   
   

   To get more reblogs:

   • Regularly reblog other people's posts in your niche.
   • Respond to comments (including those left in tags) – Tumblr encourages conversation, and it usually works better when you do not drop a link into every interaction.
   • Join in on trending tags, but do it in a way that fits your style (e.g., if #cats is trending, show your cat in a fun or unusual way, not just "here's my cat").

6. Avoid common mistakes

   You're free to post what you like as long as you follow Tumblr's rules, but there are a few things the community tends to dislike:

   • Overusing "followers only" posts – they can feel exclusionary and annoying.
   • Automatic cross-posts from Twitter/X, Instagram, or TikTok – Tumblr's algorithms often downgrade them, and users tend not to engage.
   • Using tiny fonts or light text on a light background – many people use dark mode, so poor contrast makes your posts hard to read.
   • On headers, placing important text near the very edges – themes and mobile views can crop it, and custom themes can display the header differently on desktop vs. mobile browsers.
   • Dropping store or product links in every single post – instead, put them in a pinned post or your blog description; Tumblr gives you free customization, while some other platforms lean on paid options for extra profile features, and your web address and blog description are better places for recurring mentions than every post.
   • Deleting old work – Tumblr loves archives, and old posts can suddenly get notes again when someone rediscovers them or reblogs them.