The storage limit for a Claude artifact is 20 MB per artifact, text only, on the Pro, Max, Ultra, Team and Enterprise plans. Anthropic's help center says so in one sentence. It doesn't publish a size or length limit for the artifact itself in claude.ai, and it doesn't promise how long an artifact is kept.
If your page has to keep what people type, collect files, or work for visitors who never sign in to Claude, host it on Hostus: records and file uploads have published limits, visitors write without an account, and a page has no expiry date unless you set one. Below, every limit we could find, quoted from Anthropic's help center and the Claude Code docs, read on 7 November 2026. Where Anthropic gives no number, we say so.
The storage limit: 20 MB of text, on paid plans
Anthropic's article What are artifacts says: "Storage has a 20 MB limit per artifact and accepts text only, no images, files, or binary data."
- Plans: storage is available on Pro, Max, Ultra, Team and Enterprise, on Claude on the web and Claude Desktop. The Free plan has no storage in the article's feature table.
- Two kinds: personal storage, where each person keeps their own data, and shared storage, where everyone sees the same data. Claude asks for confirmation the first time you use shared storage.
- No publish needed: new artifacts store data without being published. Legacy artifacts, made in a chat before 16 September 2026, store data only after you publish them.
- Unpublishing deletes it: unpublishing a legacy artifact permanently deletes all its stored data.
Is there a size or length limit for Claude artifacts?
For artifacts in claude.ai, Anthropic's help center gives no maximum size or length. The only number it attaches to an artifact is the 20 MB of storage. It describes an artifact as content that is "typically over 15 lines", which is when Claude makes one, not a cap.
| Limit people search for | What Anthropic's pages say |
|---|---|
| Storage per artifact | 20 MB, text only (help center) |
| Size of an artifact made in Claude Code | The rendered page must be 16 MiB or smaller (Claude Code docs) |
| Size or length of an artifact made in a chat | No number published |
| 100 MB | No 100 MB limit appears on any Anthropic page we read |
| Files uploaded to an artifact | No size published. Invited editors from outside can upload "only images and videos", and the admin guide says uploaded assets are stored persistently |
In practice, a long artifact is bounded by how much Claude writes in one go, which the Claude Code docs describe as output tokens. Large images embedded in the page are what the docs name as the usual cause of a failed publish.
Can an artifact keep a log of what users enter?
Yes, with shared storage, as long as the people typing are signed in to Claude. The Share artifacts article draws the line:
- People who open an "Anyone with the link" artifact without signing in, or from outside your organization, can't use the parts that need Claude or connected apps, and can't see or add comments.
- If the artifact saves information, people outside your organization "can read it once they sign in to Claude, but they can't change it." On Pro, Max and Ultra, outside means anyone other than you.
- People who aren't signed in can't see stored information, so an artifact that keeps most of its content there shows them "little or nothing".
So a guest book, a sign-up sheet or a usage log filled by the public doesn't work in a Claude artifact on a personal plan. Only you can write. That is the case Hostus is built for: on a public page, visitors write records with no account and no key in the page.
How long do Claude artifacts last?
Anthropic doesn't give an expiry for an artifact on a personal plan. Everything you make is saved to the Artifacts tab in the sidebar. Its pages name the ways an artifact or its data goes away:
- You delete it. Everyone you invited loses access.
- You unpublish a legacy artifact. The link stops working, you can't publish it again, and its stored data is deleted.
- Your organization's retention policy. The Claude Code docs say Team and Enterprise owners set "how long artifacts are kept before automatic deletion", with separate periods for private and shared artifacts. The admin guide adds that, under a custom retention period on Enterprise, an artifact can be permanently deleted if nobody opens it for that period.
- An owner switches artifacts or external sharing off. Shared links stop working until it is switched back on. Nothing is deleted.
Is an artifact on a Team account hosted forever? Anthropic doesn't promise a period. It hands the choice to your organization's owners. The one fixed clock in the help center is for invitations: "Pending invitations expire after 30 days." Accepted ones don't.
Comments, the Free plan and Team accounts
- Comments: people with Commenter or Can edit access can comment. People who only have the public link can't see or add comments. Invited people from outside can't mention anyone or ask Claude in a comment, and can't comment on an artifact that is also shared with "Anyone with the link". In Claude Code, comments are for people you share with inside your organization.
- Sharing on the Free plan: in the help center's table, Free has no "Share with anyone who has the link" and no email invitations. Free can still publish a legacy artifact made in a chat before 16 September 2026.
- Who needs an account: "Most artifacts shared with 'Anyone with the link' open without a Claude account or sign-in." Docs open only for people signed in, and some artifacts, like dashboards, show their content only after sign-in.
- Team and Enterprise: artifacts stay inside your organization by default. "Anyone with the link" works only when an Owner turns on External sharing or allows that one artifact.
Hostus limits, side by side
Every Hostus number below comes from our own code.
| Limit | Hostus | Claude artifact |
|---|---|---|
| The page itself | One HTML file up to 4.5 MB per upload, about 4 MB through the connector. Account total: 2 MB free, 200 MB paid | No number for chat artifacts; 16 MiB rendered in Claude Code |
| Files next to the page | Up to 40 images, videos, fonts or scripts, 25 MB each, 150 MB per page, inside your account total | Uploads exist; no size published |
| Files visitors upload | 10 MB each, 200 per page. Free: 100 MB per page, 200 MB per account. Paid: 1 GB and 5 GB. Images, PDF, CSV, text, JSON, Word, Excel, PowerPoint | Storage is text only |
| Stored data | 32 KB per record, 20 collections per page, 1,000 records per collection free, 20,000 paid | 20 MB per artifact, paid plans only |
| Who can write data | Any visitor, no account. You can require sign-in or give each reader their own records | Signed-in users; outsiders read only |
| How long it lasts | No expiry, on the free plan too, unless you set a date through the API or connector, up to 90 days | No published expiry; organization retention on Team and Enterprise |
| Feedback from readers | Readers reply on a section in a private thread with you, and can ask the page questions | Comments for invited and organization members |
| Free plan | 20 pages, a public link, data and forms included | No link sharing for new artifacts, no storage |
Which should you use?
Hostus, when the page goes to people outside Claude: a sign-up sheet, a quiz that keeps scores, an intake form with attachments, a tracker a client fills in. Visitors write without an account, files are allowed, the page stays up until you delete it, and you see who read what. Claude publishes and updates it through the connector. To move an artifact over, see how to share a Claude artifact with anyone.
Artifact storage, pick it if you are on a paid plan, the data is text, and everyone who writes is you or your organization. Nothing to export.
For a page that grew into accounts, permissions and billing, a real backend is the honest answer. Most trackers never get there. The full picture of artifact data is in can a Claude artifact save data.
Good to know before you switch
Every Hostus page shows a small "Published with Hostus" badge in a corner, on the free and the paid plan. The link is your-page.hostus.page, with no custom domain. Pages are noindex, so they don't show up in Google. A new page starts private: you make it public or email-gated in the dashboard. Stored data is records of up to 32 KB, not a database with joins, and it works only while the page is hosted on Hostus. Hostus keeps the last 20 versions of each page. Expiry dates exist only through the API and the connector, not in the dashboard.