Image Specs
Photo Post
| Dimensions | Up to 2048 × 3072 px (displayed at 1280 px max width) |
|---|---|
| Max File Size | 20 MB per image |
| File Formats | JPG, PNG, GIF, BMP, WEBP |
| Notes | Up to 10 photos per photoset post; animated GIFs supported |
Animated GIF
| Dimensions | Up to 2048 × 3072 px |
|---|---|
| Max File Size | 10 MB |
| File Formats | GIF |
| Notes | Tumblr is known for its GIF culture; GIFs auto-animate in the feed |
Avatar
| Dimensions | 128 × 128 px (upload at 512 × 512 px for retina sharpness) |
|---|---|
| Max File Size | 10 MB |
| File Formats | JPG, PNG, WEBP |
| Notes | Displayed as a square with rounded corners; GIFs can be uploaded but are converted to a static image, so animated avatars are no longer supported |
Blog Header
| Dimensions | 3000 × 1055 px recommended |
|---|---|
| File Formats | JPG, PNG, GIF |
| Notes | Shown at the top of your blog; keep key content in the centre 1200×600 px safe zone — edges are cropped on many screen sizes |
[Ad]
Video Specs
Video Post
| Max File Size | 500 MB |
|---|---|
| File Formats | MP4, MOV, AVI, WMV, WEBM |
| Resolution | Up to 1280 × 720 px recommended |
| Max Duration | Up to 10 minutes |
| Notes | H.264 + AAC recommended; videos can also be embedded from YouTube, Vimeo, etc. |
Text & Character Limits
Text Post Body
| Character Limit | 4,096 characters per text block |
|---|---|
| Notes | Supports rich HTML formatting; the 4,096-char limit applies per content block — a post can contain up to 1,000 blocks total, with an overall 1 MB stored-content cap per post |
Post Title
| Character Limit | 300 characters |
|---|
Quote Post
| Character Limit | 4,096 characters |
|---|
Tags
| Character Limit | 30 tags; 140 characters per tag |
|---|---|
| Notes | Tags are the primary discovery mechanism on Tumblr |
Blog Description / Bio
| Character Limit | 1,000 characters |
|---|
Blog Name (URL)
| Character Limit | 32 characters |
|---|---|
| Notes | Becomes yourblog.tumblr.com; lowercase letters, numbers, and hyphens |
Profile & Blog Assets
Avatar
| Dimensions | 128 × 128 px (upload at 512 × 512 px for retina sharpness) |
|---|---|
| Max File Size | 10 MB |
| File Formats | JPG, PNG, WEBP |
| Notes | Displayed as a square; GIFs can be uploaded but are converted to a static image, so animated avatars are no longer supported |
Blog Header
| Dimensions | 3000 × 1055 px |
|---|---|
| File Formats | JPG, PNG |
Blaze Ads
Blaze Promoted Post (Image)
| Dimensions | Minimum 600 × 600 px |
|---|---|
| Aspect Ratio | 1:1, 4:3, or 16:9 |
| Max File Size | 5 MB |
| File Formats | JPG, PNG |
| Notes | Tumblr Blaze boosts your post into other users' feeds; starts from $5/day, up to $50/day |
Blaze Promoted Post (GIF)
| Dimensions | Minimum 600 × 600 px |
|---|---|
| Aspect Ratio | 1:1, 4:3, or 16:9 |
| Max File Size | 5 MB |
| File Formats | GIF |
| Notes | Animated GIFs allowed in Blaze promotions |
Blaze Promoted Post Title
| Character Limit | 300 characters |
|---|