Hashtag Generator Online
Search public Mastodon hashtag data, compare seven-day activity and build a ready-to-copy tag set.
Method and limitations reviewed August 8, 2026. Browser-first, no login required.
Searching sends only your topic (not custom keywords) to mastodon.social or Toolsaly's relay so public hashtags can be looked up.
Topic matches for “fitness”
Select or remove tags before copying.
Selected hashtags
0
Live topic matches
0
Observed uses (7d)
0
0 hashtags selected
Trending on Mastodon
Tags with increased activity during the past week.
Live hashtag names and seven-day activity come from the public API at mastodon.social. If direct access fails, Toolsaly relays the same public request. Counts describe that Mastodon server only; they are not Instagram, YouTube or global popularity estimates.
Your topic is sent to mastodon.social to search its public hashtag index; Toolsaly may relay that request if direct access fails. Custom keywords and selected output stay in your browser.
About this tool
What this tool does
The hashtag generator uses a real public social index instead of presenting a fixed list as current popularity. It keeps the source and scope visible so recent server activity is not mistaken for global platform data.
How the result is produced
- Topic searches use the mastodon.social public v2 search endpoint with the result type restricted to hashtags.
- If the browser cannot reach the public API directly, a cached Toolsaly endpoint relays the same restricted request.
- Seven-day use and account totals are summed from the daily history returned with each hashtag.
- The trending section uses the server's public trending-tags endpoint and can be refreshed independently.
- Selected live tags and custom keywords are normalized, de-duplicated and limited to 30 before copying.
Good uses
- Discovering public Mastodon hashtags related to a topic
- Comparing recent activity among closely related tags
- Building a clean draft set that combines observed and custom tags
How to verify the result
- Open promising tags on the social platform where the post will actually be published.
- Check that every selected tag is relevant to the specific post, not only popular.
- Review platform rules and recent posts before publishing a large tag set.
Known limitations
- Counts cover activity reported by mastodon.social, not every Mastodon server or the whole internet.
- The data does not represent Instagram, YouTube, TikTok or global hashtag popularity.
- Public trends change quickly, and custom keywords do not receive measured activity unless returned by the live search.