How to schedule a Tumblr photo or video (and reuse it on Mastodon)

Why schedule Tumblr together with Mastodon

Tumblr and Mastodon both reward a clear still and a short note. People who left X often keep a Tumblr blog for longer posts or reblogs, and a Mastodon account for the Fediverse timeline. Writing the idea twice and uploading the file twice is where mornings disappear. A shared queue does not remove judgment about tone. It removes the double login, the double upload, and the sticky note that said "also Mastodon at 9."

Roundup posts that list five "best Tumblr schedulers" rarely explain that split. They compare feature grids. Your week fails when Mastodon goes out as text-only because the first file was a clip meant for Tumblr. Get the media rule right before you care which logo wins a comparison table.

If you only post to Tumblr, stay on Tumblr’s queue. Pay for a scheduler when you cross networks, need a week view next to Instagram or LinkedIn, or want an agent to draft the caption through REST or MCP after the accounts are connected.

Founders who treat Tumblr and Mastodon as "the same post twice" usually burn an hour on tiny differences: character limits, whether the still uploaded, which blog or server is connected, and whether a clip belongs on both. A single queue does not erase those differences. It surfaces them in one composer so you decide once per post instead of once per app.

Tumblr's own queue, in short

Tumblr lets you queue posts inside the blog. That is the free baseline, and it is the right tool for a Tumblr-only week. Treat it the same way you treat LinkedIn’s native scheduler or X’s calendar icon: use it until the job outgrows one network.

• Queue and schedule live inside Tumblr for the blog you are logged into. One place, one network, no extra bill.

• Photo, video, text, quote and the rest of Tumblr’s post types stay in Tumblr’s editor. A third-party tool will not recreate every post type one for one.

• The queue is a Tumblr list. It will not show your Mastodon, Bluesky or LinkedIn slots next to it, so cross-network gaps stay invisible.

Keep using that queue when Tumblr is the only destination. Switch when the same file should leave Tumblr and hit another network at a set time, or when you want replies from several networks in one Inbox after the post goes live.

Connect Tumblr and Mastodon

Two connections, two credential shapes. Do this once, then the composer can see both channels every time you open Create.

Bluesky is a third option if you want the still on AT Protocol too. Connect with a handle and app password, then add it as another channel on the same post. Media rules for Bluesky (up to four images, or video) are covered in the Bluesky and Mastodon cross-post guide. Pixelfed is photo-required if you want a third Fediverse home for the still; it will not take a text-only status.

Photo vs video: what each network actually gets

This is the part most Tumblr scheduler listicles skip. Postlaty sends Tumblr text plus the first image or the first video. Mastodon gets the first image only; a video file is not uploaded there. The publisher path is intentional: Tumblr’s NPF content array can hold a text block and an image or video block from that first file. Mastodon’s media upload runs only when the first file is an image.

• Photo first: attach one still as the first file. Tumblr posts an image block. Mastodon uploads that same still. Extra images after the first are not sent to either network in this path.

• Video first: Tumblr gets a video block from the first file. Mastodon skips the video, so the Mastodon side goes out as text only unless you attach a still instead.

• Want both a clip and a Fediverse still? Schedule the video to Tumblr alone, then a separate post with the still to Mastodon (and Bluesky if you use it). One calendar, two posts, honest media.

Generate the still in Create with Recraft, Flux, or Nanobanana when you do not have a photo yet. Name the models you actually use in the trial so you know which look you like before you queue a week. If you already shoot on a phone, export one clean frame as the Mastodon still and keep the full clip for Tumblr.

Analytics after the fact stay per network: Tumblr posts show through the connected blog; Mastodon posts show through the instance. Do not expect one blended "engagement" number across both. Read each side for a week before you change the posting times.

Schedule the Tumblr and Mastodon pair

Once both accounts are connected, the weekly motion is short. Batch on a computer, then answer early replies from wherever you already check Inbox.

1. 1

   Open Create and pick both channels

   Select the Tumblr blog connection and the Mastodon account. Add Bluesky only if the still should go there too.

2. 2

   Attach the first media file

   Use a photo when both networks should show media. Use a video only when Tumblr is the media destination for this post.

3. 3

   Turn on Different captions

   Write a longer Tumblr caption if you need it. Keep Mastodon inside 500 characters. Drop Tumblr tags that do not belong on Mastodon.

4. 4

   Pick one time and schedule

   Check the week view so the slot is free on both. After it publishes, skim Comments for early replies.

Starter is $29 a month for 10 channels, Pro is $39 for 20, Premium is $49 for 50. Inbox, AI models, agents and templates sit on every plan. Yearly billing gives two months free on the same limits. The 7-day free trial is enough to connect Tumblr, connect Mastodon, and confirm a photo post lands on both sides at the time you picked.

A practical week for a founder who still likes Tumblr: three photo posts to Tumblr and Mastodon on the same times, one Tumblr-only video mid-week, and one quieter day for replies. That pattern respects the media rules without turning the calendar into a spreadsheet.

Agents can create the same scheduled post after the accounts are connected. Use REST or MCP from Cursor, Claude, or ChatGPT to draft the caption and set the time, then review the week view before anything goes live. The human check stays on the media file: photo for the pair, video for Tumblr alone.

Captions that fit each feed

Tumblr culture still likes tags and a longer note under the media. Mastodon prefers a shorter status and fewer hashtag piles. Different captions exists so you do not paste a Tumblr essay into a 500-character box. The Same captions toggle is fine for a one-line announcement. Everything else deserves two boxes.

When you add Bluesky to the same post, trim again. Bluesky’s composer limit is 300 characters. The hook that fits Tumblr will not fit Bluesky unchanged. Three captions for three cultures is normal; one caption for three networks is how posts look pasted.

Limits to know before you queue a week

Honest limits save retries. These are the ones that matter for Tumblr and Mastodon in Postlaty today:

• First file only on Tumblr: text plus one image or one video. Carousels of several Tumblr photos are made in Tumblr, not in this composer path.

• Mastodon skips video in Postlaty. A Tumblr video post will not automatically become a Mastodon video.

• One Tumblr blog per connection. One Mastodon server token per connection. Plan channels the way you plan brands.

• No Tumblr DMs in Postlaty. Replies and mentions are the inbox path when the token allows.

Those limits are product facts, not marketing footnotes. Build the week around a still when you cross-post, and keep Tumblr video for Tumblr-only slots. If a workflow depends on Tumblr post types Postlaty does not send (quotes, chat posts, multi-photo sets), keep that work in Tumblr’s editor and only schedule the photo or video posts that fit the composer.

Channel counts matter once you add Instagram, LinkedIn, or a second Tumblr blog. Starter’s 10 channels are enough for a personal blog, one Mastodon server, and the main public networks. Move to Pro or Premium when the mix of blogs and brand accounts crosses that line, not because Tumblr alone needs a higher plan.

The bottom line

Use Tumblr’s queue when Tumblr is the only destination. Use a scheduler when the same photo should also reach Mastodon (or Bluesky) at a set time, with a caption written for each feed. In Postlaty that means: connect the blog, connect the server, attach the first file on purpose, write two captions, schedule once. Put the video on Tumblr alone when Mastodon should not go out as text-only by accident.

Start with one photo post to both networks during the trial. If the still arrives on Tumblr and Mastodon at the time you picked, the rest of the week is the same motion: batch the stills, isolate the clips, answer the first replies from Inbox.

More on nearby networks: Bluesky, Mastodon, Tumblr, and the Bluesky and Mastodon guide.