Tumblr
BulkPublish
Schedule and bulk publish Tumblr posts
Queue up Tumblr posts with images, video and long text, and they publish to your blog on the schedule you set.
What you can publish to Tumblr
BulkPublish supports 1 Tumblr post type. It is checked before it is queued, so a post Tumblr would reject never reaches your content calendar.
| Post type | Media |
|---|---|
| Post | Optional, up to 30 images or videos |
Tumblr limits and specs
These are the character limit, image sizes and video specs BulkPublish checks before a post is queued. They match what Tumblr itself accepts.
| Limit | Value |
|---|---|
| Caption length | 32,768 characters |
| Image formats | JPG, JPEG, PNG, GIF, WEBP |
| Max image size | 20 MB |
| Images per post | 30 |
| Video formats | MP4, MOV |
| Max video size | 500 MB |
| Max video length | 10 minutes |
| Threads | Not supported on Tumblr |
Tumblr analytics
Tumblr has no public metrics API, so per-post numbers are not available. Link clicks are still tracked, because BulkPublish measures those itself through its own short links on every platform.
How to connect Tumblr
Sign in with Tumblr and approve access, then choose the blog if you run more than one.
- Create a BulkPublish account. The free plan connects three channels and does not ask for a card.
- Open Channels and choose Tumblr.
- Sign in with Tumblr and approve the permissions. BulkPublish stores the token, refreshes it on its own, and tells you if it ever needs reconnecting.
- Write a post, pick a time, and queue it. There is nothing else to install.
Ways teams use the Tumblr integration
Artists, fandom blogs and writers who post often to Tumblr and want it kept active alongside their other networks.
- Bulk upload a month of Tumblr posts from a CSV in one pass, then let the queue send them out at the times you set.
- Write once and cross-post everywhere. The same post, adapted per network, goes to Tumblr and every other connected channel together.
- Turn a blog or podcast RSS feed into an automatic Tumblr post the moment a new item appears.
- Ask an AI agent to draft the week, review it in the content calendar, and approve it. The agent schedules to Tumblr through the MCP server.
Who publishes to Tumblr this way
Each of these has a page of its own, with the networks and the features that audience leans on.
Post to Tumblr from an AI agent
The hosted MCP server exposes 20 tools over OAuth 2.1, so Claude, ChatGPT, Muse, Grok, Cursor and any other MCP-compatible agent can draft, schedule, publish and read Tumblr analytics for you. There is no API key to paste and nothing to run locally.
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Claude -
ChatGPT -
Grok -
Grok Bot -
Muse -
Manus -
Cue -
Cursor -
Antigravity -
Codex CLI -
Gemini CLI -
Windsurf -
VS Code -
Cline -
Warp -
OpenClaw -
Hermes
Tumblr API access
Everything on this page is available programmatically. One REST endpoint publishes to Tumblr and every other channel, with SDKs for Node and Python, a Postman collection, and first-party nodes for n8n, Zapier, Make and IFTTT.
Free Tumblr tools
Free to use, no sign-up. They are handy while you are writing the post, and you can schedule the result here when you are done.
- Tumblr Character Counter
- Preview Tumblr Post Online
- Best Time to Post on Tumblr
- Tumblr Line Breaker
- Tumblr Bold & Italic Text Generator
More on Tumblr
Guides and answers from our blog about publishing to Tumblr.
Frequently asked questions
Common questions about scheduling Tumblr posts with BulkPublish.
Can I schedule Tumblr posts in advance?
Yes. Pick any future time in your own timezone, or drop the post into a recurring queue slot and BulkPublish picks the next opening for you. Scheduled posts publish on their own, so nothing on your phone has to be awake.
Can I auto-post to Tumblr automatically?
Yes. A recurring queue publishes on a repeating weekly pattern without you choosing a date each time, and an RSS feed can auto-post to Tumblr the moment a new item appears. Both run on our servers, so they keep working while you are offline.
How many Tumblr posts can I schedule at once?
As many as your plan allows. Bulk Compose takes a CSV or a pasted list and turns it into a full schedule in one pass, so a month of Tumblr content is one upload rather than thirty separate posts.
Can I plan a content calendar for Tumblr?
Yes. The calendar shows every scheduled post across all your channels at once, so you can see what is going out on Tumblr next to everything else, drag a post to a new slot, and spot the gaps before they happen.
What is the Tumblr character limit?
32,768 characters per post. BulkPublish counts as you type and blocks anything over the limit before it is queued, so you find out while you are writing instead of when the post fails.
Can I post to more than one Tumblr account?
Yes. Connect as many Tumblr accounts as your plan allows, group them into channel sets, and publish to the whole set at once. Each account keeps its own schedule, its own analytics and its own token.
Do I get Tumblr analytics?
Published posts are checked for their numbers and shown next to every other channel, so you can compare Tumblr engagement against the rest without switching tabs. Link clicks are measured by BulkPublish itself, so they are available even where Tumblr reports nothing.
Is there a free Tumblr scheduler plan?
Yes. Three channels and thirty posts a month, with no card required. Tumblr counts as one channel per connected account.
Still stuck? The Help Center walks through it step by step.
Other platforms
BulkPublish publishes to 15 networks in all. Each has its own page with its limits, post types and setup.
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Facebook -
Instagram -
X / Twitter -
TikTok -
YouTube -
Threads -
Bluesky -
Pinterest -
Google Business -
LinkedIn -
Mastodon -
Discord -
Telegram -
Snapchat
Start publishing to Tumblr
Connect your account and schedule your first post in a couple of minutes. Free plan, no card, cancel whenever you like.