# Viewer shows 'Invalid markdown provided' instead of the document

**What you are seeing**

The viewer shows 'Invalid markdown provided' instead of the document.

---

## Why it happens

The content did not look like Markdown to the viewer, which names the language it detected instead of rendering the file.

---

## What to do

Confirm the file really contains Markdown.

---

## Limits that apply here

| **Limit**              | **Value**                  | **What happens**                                                                                                                                               |
| ---------------------- | -------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Large document preview | About 1,000,000 characters | Read-only previews longer than this switch to a virtualised viewer that renders in chunks as you scroll, so browser find-in-page and similar behaviour differ. |
| Raw HTML in Markdown   | Not rendered               | The viewer strips HTML and sanitises output, so HTML tags embedded in a Markdown document do not render.                                                       |

---

## Related

[There is no way to restrict who can add Markdown, turn diagram languages on or off, point diagrams a](https://help.gocapable.com/jira-markdown/there-is-no-way-to-restrict-who-can-add-markdown-turn-diagram-languages-on-or-off-point-diagrams-a.html)

[Security review asks where document content and diagram source goAll external addresses are declared as not in scope for end-user data.](https://help.gocapable.com/jira-markdown/security-review-asks-where-document-content-and-diagram-source-go.html)

[Everything elseThe rest of this family.](https://help.gocapable.com/jira-markdown/everything-else.html)

---

_Found it? Good._