The Nostr hashtag tool from Postiz is a free AI hashtag generator built specifically for Nostr notes. Paste your draft, and it returns a curated set of lowercase hashtags optimized for the way Nostr clients index and surface content. Whether you are broadcasting a long-form article, a plebchain update, a zap-worthy art drop, or a developer changelog, this generator helps your notes reach the right relays, feeds, and communities without the guesswork of manual tag research.
Unlike centralized networks, Nostr has no algorithmic feed ranking your posts. Discovery is driven entirely by relays, clients, and the tags attached to each event. That means hashtags are not decorative on Nostr — they are the primary discovery mechanism. A good tag set is the difference between a note seen by three followers and one that circulates across Damus, Amethyst, Primal, Iris, Coracle, and Snort.
How Nostr hashtags actually work
Nostr hashtags are implemented as NIP-12 generic tags, specifically the single-letter t tag. When you publish a kind 1 short text note or a kind 30023 long-form article, clients parse every #word in the content and add a corresponding ["t", "word"] entry to the event’s tags array. Relays then index these t tags, which lets any client query “give me every note with #bitcoin” across the network.
Three important details shape how you should choose tags:
- Lowercase normalization. Most Nostr clients and relays lowercase the tag value before indexing.
#Bitcoin, #bitcoin, and #BITCOIN collapse into the same feed. Always write hashtags in lowercase to match how feeds are queried.
- No spaces, no punctuation. A hashtag ends at the first whitespace or punctuation character.
#building in public becomes only #building. Use #buildinginpublic or #buildinpublic instead.
- Client-specific feeds. Damus, Amethyst, Primal, Iris, Coracle, and Snort all expose hashtag feeds, but they pull from different relay sets. A tag that trends on Damus may be quiet on Amethyst simply because the users sit on different relays.
How to use the Nostr hashtag tool
The flow is intentionally simple so you can stay in your writing rhythm:
- Paste the draft of your Nostr note, long-form article, or zap request into the input field.
- Optionally add a topic hint like “plebchain”, “nostr art”, or “bitcoin dev” to steer the suggestions.
- Click generate. The AI returns a ranked list of hashtags formatted for NIP-12 indexing.
- Copy the tags that match your audience and paste them at the end of your note.
- Publish through your favorite client, or schedule the note through Postiz alongside your other channels.
Tag strategies by community
Nostr is not one audience. It is a federation of overlapping tribes, and each tribe rewards different tag vocabularies.
Bitcoin, crypto, and plebchain
The plebchain community is the beating heart of Nostr. Notes in this space do best with a tight mix of protocol-level and culture-level tags. Try #bitcoin, #nostr, #plebchain, #zaps, #lightning, #sats, #v4v (value-for-value), and #freedomtech. For market commentary add #bitcoinnews; for self-custody topics use #selfcustody and #notyourkeys.
Art, photography, and music
Nostr has a thriving creator economy powered by zaps. Art notes should lead with #art, #nostrart, #artstr, and medium tags like #photography, #photostr, #illustration, #pixelart, or #music. Musicians frequently use #wavlake and #musicstr to reach listeners who zap tracks directly.
Developers and open source
Devs use Nostr to ship in public. Pair #nostrdev and #devstr with language or stack tags such as #rust, #typescript, #golang, or #python. For protocol work, include the relevant NIP like #nip05, #nip23, or #nip57 so client and relay authors actually see your update.
Building in public and founders
If you are shipping a product, weave #buildinpublic, #startup, #founders, #indiehackers, and #saas together. Mix in one community tag like #nostr or #plebchain so the note surfaces inside Nostr-native feeds rather than only generic ones.
Use cases
- Creators and artists who want their drops to surface in #artstr feeds and attract zap support from collectors browsing Amethyst or Primal.
- Developers publishing release notes, NIP proposals, and technical threads that need to reach other protocol builders across relays.
- Zappers and podcasters promoting value-for-value shows who rely on #v4v, #podcasting20, and topic tags for listener discovery.
- NIP-23 long-form writers publishing essays on Habla, Yakihonne, or Highlighter who need consistent tag vocabulary so readers can follow a topic across articles.
- Newcomers trying to find their community — a well-tagged introduction note is the fastest way to get followed back on Nostr.
Best practices for Nostr hashtags
- Always lowercase. Match the normalized form that relays index, otherwise your note is invisible to tag queries.
- Three to five tags per note. Nostr culture rewards restraint. Huge tag stacks read as spam and get filtered by opinionated relays.
- Mix broad and niche. One high-volume tag (#nostr, #bitcoin) for reach, plus two or three niche tags (#artstr, #plebchain, #nostrdev) for relevance.
- Check client feeds before publishing. Open Damus or Amethyst, search the tag, and see if the feed matches your note’s intent.
- Be consistent across notes. Nostr has no follow-a-topic button yet — readers follow you because they see the same tags from you repeatedly.
- Avoid camelCase inside tags. It still works, but it fragments audiences who type the lowercase form.
- Don’t stuff unrelated tags. Relay operators increasingly filter notes that abuse trending tags, which can get your pubkey quietly muted.
Frequently asked questions
Do Nostr hashtags work across all clients?
Yes. Because hashtags are NIP-12 t tags stored on the event itself, any client that queries a relay for that tag will surface the note. Damus, Amethyst, Primal, Iris, Coracle, Snort, Habla, and Yakihonne all support tag feeds.
Is this Nostr hashtag tool free?
Yes. The generator is free to use. If you want to schedule Nostr notes alongside your posts on other networks, Postiz offers a full scheduling suite with a free plan.
How many hashtags should a Nostr note use?
Three to five is the sweet spot. Enough to land in multiple feeds, few enough to look native rather than spammy. Long-form NIP-23 articles can comfortably carry five to seven tags.
Should I hashtag every word or only key topics?
Only key topics. Over-tagging dilutes the signal and trains relays to throttle your pubkey. Pick the tags a reader would actually search for.
Do uppercase and lowercase hashtags behave differently?
In practice, no. Clients normalize to lowercase before querying, so #Nostr and #nostr land in the same feed. Writing lowercase is the safest default.
Can I use this tool for NIP-23 long-form articles?
Absolutely. Long-form articles on Habla, Yakihonne, and Highlighter are indexed by the same t tags. The tool generates slightly broader tag sets for long-form content to match reader search behavior.
Schedule your Nostr notes with Postiz
Great hashtags are only half the battle — consistency is the other half. Postiz lets you draft, schedule, and publish Nostr notes alongside X, LinkedIn, Instagram, Threads, Bluesky, Mastodon, and every other network your audience lives on. Pair the Nostr hashtag tool with Postiz scheduling and you get a complete workflow: generate the right tags, queue the note, ship it at the right time, and watch the zaps roll in. Try Postiz today and bring your Nostr strategy up to the same level as the rest of your social stack.
