How to Schedule Posts on Mastodon From the Web Interface

Mastodon does not include a built-in scheduling feature in its standard web interface. This means you cannot compose a post today and set it to publish automatically tomorrow without using a third-party tool. However, you can schedule posts through Mastodon-compatible client applications such as Semaphore, Fedica, or Buffer. This article explains how to schedule posts on Mastodon using the web interface of these supported third-party tools. You will learn the exact steps to set up a scheduled post and avoid common pitfalls.

Why Mastodon Does Not Include Native Post Scheduling

Mastodon is designed as a decentralized, real-time social network. The core developers have prioritized features like federation, content moderation, and accessibility over content scheduling. The standard web interface, which is the default experience for most users, only provides a compose box with a publish button. There is no date picker or time selector in the Mastodon web UI.

To schedule posts, you must use a third-party application that connects to Mastodon through the Mastodon API. These applications act as clients that can create posts and store them in a queue. When the scheduled time arrives, the application sends the post to your Mastodon instance using your account credentials. The post then appears on your profile and federates to other servers exactly as if you had published it manually.

Prerequisites for Scheduling Posts

Before you begin, ensure you have the following:

• A Mastodon account on any instance that supports the Mastodon API. All instances do.
• A web browser such as Chrome, Firefox, or Edge.
• An account on a supported scheduling tool. Semaphore and Fedica require registration with your email address. Buffer requires a Buffer account.
• Your Mastodon instance URL, for example mastodon.social or your own custom domain.

Steps to Schedule Posts Using Semaphore

Semaphore is a free web-based scheduling tool designed specifically for Mastodon. It runs entirely in the browser and does not require a server or app installation.

1. Open Semaphore in your browser
   Go to semaphore.social. The page displays a simple compose interface similar to Mastodon.
2. Connect your Mastodon account
   Click the Connect to Mastodon button. A pop-up window asks for your instance URL. Enter your full instance address, for example https://mastodon.social. Click Authorize. Semaphore requests read and write permissions for your account. Confirm the authorization.
3. Write your post
   Type your post content in the compose box. You can add text, hashtags, mentions, and up to four images. Semaphore supports content warnings and alt text for images.
4. Set the schedule date and time
   Below the compose box, locate the Schedule for field. Click the date input and select a future date using the calendar picker. Click the time input and set the hour and minute in your local time zone. Semaphore converts the time to UTC when posting.
5. Schedule the post
   Click the Schedule button. The post moves to a queue that appears below the compose box. You can see the scheduled time and edit or delete the post before it publishes.
6. Verify the post publishes
   At the scheduled time, return to your Mastodon profile. The post appears on your timeline. You can also check Semaphore’s queue to see a green checkmark next to published posts.

Steps to Schedule Posts Using Fedica

Fedica is a social media management dashboard that supports Mastodon, Twitter, and LinkedIn. It offers scheduling, analytics, and cross-posting features.

1. Sign in to Fedica
   Go to fedica.com and click Log in. Create an account using your email address or sign in with Google.
2. Add your Mastodon account
   In the Fedica dashboard, click Accounts in the left sidebar. Click Add Account and select Mastodon. Enter your instance URL and click Connect. Authorize the connection in the Mastodon pop-up window.
3. Open the composer
   Click Compose in the top toolbar. A compose window opens with fields for text, images, and links.
4. Write your post
   Type your message in the text area. You can add up to four images. Fedica supports content warnings and polls. To add a poll, click the poll icon and enter options.
5. Set the schedule
   Below the compose area, locate the Schedule section. Click the date field and pick a future date. Click the time field and set the hour and minute. Fedica uses your local time zone. You can also choose Best Time to let Fedica suggest an optimal posting time based on your audience activity.
6. Queue the post
   Click Schedule Post. The post appears in the Scheduled tab of the dashboard. You can edit or delete it before the scheduled time.

Steps to Schedule Posts Using Buffer

Buffer is a popular social media scheduling tool that supports Mastodon through its browser extension. The extension adds a schedule button directly to the Mastodon web interface.

1. Install the Buffer browser extension
   Open Chrome Web Store or Firefox Add-ons. Search for Buffer and install the official extension. The extension adds a Buffer icon to your browser toolbar.
2. Create a Buffer account
   Click the Buffer icon and sign up with your email address. You can use the free plan for up to ten scheduled posts.
3. Connect Mastodon to Buffer
   In the Buffer dashboard, click Channels and then Add Channel. Select Mastodon. Enter your instance URL and authorize the connection.
4. Compose a post on Mastodon
   Open your Mastodon instance in the browser. Click the compose button to open the post editor. Write your post as usual.
5. Use the Buffer schedule button
   Below the Mastodon compose box, you see a new Schedule button added by the Buffer extension. Click it. A pop-up shows a date and time picker. Select a future time and click Schedule. The post is saved to your Buffer queue and will post automatically.

Common Mistakes and Limitations When Scheduling Mastodon Posts

Scheduled Post Does Not Appear on Mastodon

If a scheduled post never publishes, the scheduling tool may have lost its API connection to Mastodon. Open the tool’s settings and reconnect your Mastodon account. Also check that the scheduled time has passed in the tool’s time zone. Some tools use UTC and your local time may differ.

Images or Polls Are Missing From the Published Post

Not all scheduling tools support polls or multiple images. Semaphore supports up to four images and content warnings but does not support polls. Fedica supports polls and images. Buffer supports text and images but not polls. Before scheduling, verify that the tool supports the media type you want to include.

Scheduled Post Contains Wrong Time

Most scheduling tools display times in your local time zone but store them in UTC. If you travel to a different time zone after scheduling, the post may publish at a different local time than intended. To avoid this, schedule posts only when you are in your home time zone, or use a tool that displays the scheduled time in UTC.

Semaphore vs Fedica vs Buffer: Scheduling Features Compared

Item	Semaphore	Fedica	Buffer
Price	Free	Free tier with limits; paid plans start at $9/month	Free tier up to 10 posts; paid plans start at $6/month
Supports images	Up to 4 images	Up to 4 images	Up to 4 images
Supports polls	No	Yes	No
Content warnings	Yes	Yes	No
Alt text for images	Yes	Yes	Yes
Browser extension	No	No	Yes
Analytics	No	Yes	Yes

You can now schedule posts on Mastodon using Semaphore, Fedica, or Buffer. Choose Semaphore for a simple free tool. Choose Fedica if you need analytics and poll support. Choose Buffer if you want to schedule directly from the Mastodon compose box using a browser extension. After scheduling your first post, try using Fedica’s Best Time feature to find the optimal posting hour for your audience.