Mastodon Caption Generator
Caption Generators
Generate scroll-stopping Mastodon captions in seconds — tuned to Mastodon's tone, length and audience. Free, instant, and no signup required.
What makes a good Mastodon post
Mastodon gives you room most platforms don't: the default character limit on flagship servers is 500, and some instances raise it well past that. There's no algorithm reordering your feed, so a post lives or dies by its first line and whether people choose to boost it. The detail most newcomers miss is the content warning field, the CW that hides text behind a tap. Used well, it's a courtesy, not censorship, and the community genuinely expects it for spoilers, politics and heavy topics.
Mastodon post tips
- Always write descriptive alt text on images. Mastodon's culture treats missing alt text as rude, and people will tell you.
- Use a content warning for spoilers, politics or sensitive topics. It hides the body until someone chooses to expand.
- Hashtags are the only discovery tool here, so add a few specific ones. There's no algorithm doing the surfacing for you.
- Boosts, not likes, spread your post across instances. Write something people want to re-share, not just quietly favourite.
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Mastodon Caption Generator — common questions
Latest questions readers ask us about this topic.
What's the character limit for a Mastodon post?
500 characters on mastodon.social and most flagship instances. But the limit is set per server, so some communities allow far more, occasionally several thousand. Check your home instance, since it governs what you can post.
What is a content warning on Mastodon?
A CW is a short text label that hides your post's body behind a click. It's used for spoilers, sensitive subjects and long threads. The community strongly expects it, and respecting it earns you goodwill.
Do hashtags matter on Mastodon?
Yes, more than almost anywhere. With no recommendation algorithm, hashtags are the main way people find posts outside their follows. Use specific, capitalised-for-readability tags like CamelCase, which also improves screen-reader pronunciation.
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