When you join a Mastodon instance, you agree to that server’s specific rules about content, behavior, and federation. Many users skip reading these rules and later find their posts removed or their account suspended for violating policies they never saw. The rules vary widely between instances — some allow all legal content, while others ban political speech, commercial posts, or specific media types. This article explains where to find instance rules before you create an account and how to interpret common rule categories so you choose a server that matches your needs.
Key Takeaways: How to Review Mastodon Instance Rules Before Signing Up
- Join Mastodon > Browse server list: Shows each instance’s rules, language, and topic before you sign up.
- Instance homepage > About page: Contains the full rule text and moderation policy, accessible without an account.
- Server admin email or contact form: Use this to ask for clarification on ambiguous rules before registering.
What Instance Rules Cover and Why They Matter
Each Mastodon instance is independently operated. The server admin sets rules that all users on that instance must follow. These rules are not optional — violating them can result in a warning, content removal, or a permanent account suspension. Rules typically address three areas.
Content Policies
Content rules define what you can and cannot post. Common restrictions include bans on hate speech, harassment, spam, and adult content. Some instances also forbid political discussion, cryptocurrency promotion, or commercial advertising. A few instances require that all media be marked as sensitive. If you plan to post about controversial topics, check whether your intended instance allows them.
Behavior and Interaction Rules
Behavior rules govern how you interact with other users. They often prohibit targeted harassment, brigading, or posting private information without consent. Many instances also forbid bots that post without human review. Some servers require that you use your real name or a consistent handle. Behavior rules apply to your posts on the local timeline and to replies you send to users on other instances.
Federation and Cross-Server Policies
Federation rules control which other instances your server communicates with. An instance may block entire servers that violate its policies. If you follow users on a blocked server, their posts will not appear in your home feed. Some instances also limit how many external accounts you can follow per day. Understanding federation rules helps you avoid signing up for a server that isolates you from the communities you want to reach.
Where to Find Instance Rules Before Creating an Account
You do not need an account to read an instance’s rules. Mastodon exposes the rules on the public-facing server page. Use one of the following methods to review them before signing up.
- Open the instance homepage in a browser
Go to the instance’s web address, for example mastodon.social. The homepage displays the server name, description, and a link to the rules. If you do not see the rules immediately, scroll down to the footer or look for a link labeled “About” or “Rules.” - Click the About link on the homepage
Most instances have a prominent About link near the top of the page or in the navigation menu. Click it to open the server information page. This page includes the instance description, admin contact details, and the complete rule list. - Read the rule text on the About page
The About page shows rules as numbered items. Each rule is a short sentence or paragraph. Read every rule carefully. Pay attention to rules about media content, language restrictions, and bot usage. If a rule is vague, note the admin contact information for follow-up questions. - Check the server moderation policy
Some instances publish a separate moderation policy page. Look for links labeled “Moderation,” “Code of Conduct,” or “Terms of Service.” The moderation policy explains how the admin enforces rules and what penalties apply for violations. It may also describe the appeals process if your account is suspended. - Search for the instance on joinmastodon.org or instance directories
Websites like joinmastodon.org and instances.social list thousands of Mastodon instances. Each listing includes the server rules, language, and topic tags. These directories let you compare rules across multiple instances without visiting each server individually. - Contact the admin directly if rules are unclear
If the rules page does not answer your questions, use the admin email address or contact form on the About page. Ask specific questions about content types you plan to post. Admins usually respond within one to three business days. Do not create an account until you receive a clear answer.
Common Mistakes When Interpreting Instance Rules
Assuming All Instances Have the Same Rules
New Mastodon users sometimes assume that one set of rules applies everywhere. In reality, each instance sets its own policies. An instance that allows adult content may be fine for one user but unacceptable for another who wants a family-friendly feed. Always read the rules for each new instance you consider, even if you have used Mastodon before.
Overlooking Language and Region Restrictions
Many instances restrict posts to a specific language or geographic region. For example, a German-language instance may require all posts to be in German. If you post in English on that instance, the admin may remove your content or suspend your account. Check the instance description for language tags like “German-speaking” or “Region: Europe.”
Ignoring Media and Content Warning Requirements
Some instances require that all images, videos, and links be marked with a content warning. If you post media without a warning, the moderation system may flag your account. This rule is common on instances that allow adult content but still want to protect users from unexpected exposure. Always enable the “Mark media as sensitive” setting if the rules require it.
Not Checking Federation Blocks Before Signing Up
An instance may block other servers that host content it considers harmful. If you follow users on a blocked server, their posts will not federate to your home feed. Before signing up, search for the instance’s federation block list. Some instances publish this list on their About page. Others share it only on request. If the instance blocks servers you want to interact with, choose a different server.
Key Differences Between Reading Rules on the Web vs. the Join Mastodon App
| Item | Web Browser (Instance Homepage) | Join Mastodon App (joinmastodon.org) |
|---|---|---|
| Access to full rule text | Yes, on the About page | Yes, but limited to the description shown in the directory |
| Moderation policy visibility | Often linked separately | Not shown in the app listing |
| Federation block list | Sometimes on About page | Not visible |
| Admin contact info | Email or contact form on About page | Not shown in the app |
| Language and region tags | Shown in server description | Shown in server description |
For a complete review of instance rules, use a web browser to visit the instance homepage directly. The Join Mastodon app gives you a quick overview but does not show the full rule text, moderation policy, or federation blocks.
You can now review Mastodon instance rules before signing up by checking the About page on the instance homepage or using instance directories. Always read the rules, moderation policy, and federation block list before creating an account. If a rule is unclear, email the admin for clarification. This approach prevents account suspensions and helps you find a server that matches your posting habits.