Schedule and bulk publish Tumblr posts

BulkPublish is a social media scheduler built for people who post to Tumblr a lot. Connect your account once and you can plan a content calendar, auto-post on a repeating queue, and bulk upload a month of content in one go, whether you work from the app, a CSV, an RSS feed, the REST API or an AI agent. The same click can cross-post to every other network you have connected.

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 typeMedia
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.

LimitValue
Caption length32,768 characters
Image formatsJPG, JPEG, PNG, GIF, WEBP
Max image size20 MB
Images per post30
Video formatsMP4, MOV
Max video size500 MB
Max video length10 minutes
ThreadsNot 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

  1. Create a BulkPublish account. The free plan connects three channels and does not ask for a card.
  2. Open Channels and choose Tumblr.
  3. 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.
  4. Write a post, pick a time, and queue it. There is nothing else to install.

Ways teams use the Tumblr integration

  • 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.

Post to Tumblr from an AI agent

The hosted MCP server exposes 51 tools over OAuth 2.1, so Claude, ChatGPT, 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.

See all supported agents

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.

Read the API docs

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.

Browse all free tools

Frequently asked questions

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.

BulkPublish publishes to 15 networks. Every one has a guide like this.

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.

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