# Very large diagrams do not render at all

**What you are seeing**

Very large diagrams do not render at all.

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## Why it happens

Diagram source under 4,300 encoded characters is rendered through a GET URL; larger source is posted instead. Source too large to encode at all is dropped with only a console warning.

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## What to do

Split a very large diagram into smaller ones, or use a browser-rendered type (draw.io, Excalidraw, BPMN, DMN) which does not go through the rendering service at all.

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## Settings involved

| **Setting**                              | **Where** | **What it does** |
| ---------------------------------------- | --------- | ---------------- |
| Admin / project / site settings          | \-        | \-               |
| Diagram (gadget configuration). Diagram  | \-        | \-               |
| Diagram (gadget configuration). Language | \-        | \-               |

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## Limits that apply here

| **Limit**                                    | **Value** | **What happens**                                                                                                                                                                                         |
| -------------------------------------------- | --------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Diagram title length                         | \-        | The Title input is capped at 50 characters. Titles are used verbatim as attachment filenames with no de-duplication or sanitisation, so two diagrams with the same title produce two identically named a |
| Browse page size                             | \-        | Each JQL page requests 12 issues and the list reveals 12 rows at a time; Show more loads the next batch. (The shared hook's own default is 50; the Diagrams page overrides it to 12.).                   |
| Concurrent diagram previews on the browse pa | \-        | Diagram content is downloaded one attachment at a time through a throttle, so thumbnails on a busy site fill in progressively rather than all at once.                                                   |

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## Related

[Diagrams page under Apps is empty, or is missing diagrams that definitely exist on issuesThe browse page finds diagrams through a search index that is only written when a diagram ](https://help.gocapable.com/jira-diagrams/diagrams-page-under-apps-is-empty-or-is-missing-diagrams-that-definitely-exist-on-issues.html)

[Diagrams page is empty and every surface shows a "License Not Found" or "License expired" bannerLicensing is enforced in production. With no licence the app is replaced by the banner, an](https://help.gocapable.com/jira-diagrams/diagrams-page-is-empty-and-every-surface-shows-a-license-not-found-or-license-expired-banner.html)

[Something is missing or looks wrongThe rest of this family.](https://help.gocapable.com/jira-diagrams/something-is-missing-or-looks-wrong.html)

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_Found it? Good._