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[GH-ISSUE #19227] issue: Chat messages containing Mermaid diagrams cannot be exported as PDFs #34342

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opened 2026-04-25 08:17:08 -05:00 by GiteaMirror · 1 comment
GiteaMirror commented 2026-04-25 08:17:08 -05:00
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Originally created by @ShirasawaSama on GitHub (Nov 17, 2025).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/19227

Check Existing Issues

  • I have searched for any existing and/or related issues.
  • I have searched for any existing and/or related discussions.
  • I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!).
  • I am using the latest version of Open WebUI.

Installation Method

Git Clone

Open WebUI Version

v0.6.36

Ollama Version (if applicable)

No response

Operating System

MacOS 26

Browser (if applicable)

Edge 141

Confirmation

  • I have read and followed all instructions in README.md.
  • I am using the latest version of both Open WebUI and Ollama.
  • I have included the browser console logs.
  • I have included the Docker container logs.
  • I have provided every relevant configuration, setting, and environment variable used in my setup.
  • I have clearly listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
  • I have documented step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation. My steps:
  • Start with the initial platform/version/OS and dependencies used,
  • Specify exact install/launch/configure commands,
  • List URLs visited, user input (incl. example values/emails/passwords if needed),
  • Describe all options and toggles enabled or changed,
  • Include any files or environmental changes,
  • Identify the expected and actual result at each stage,
  • Ensure any reasonably skilled user can follow and hit the same issue.

Expected Behavior

Chat messages containing Mermaid diagrams can be displayed in exported PDFs.

Actual Behavior

Chat messages containing Mermaid diagrams cannot be exported as PDFs

Steps to Reproduce

  1. Ask LLM: "An AI assistant skilled in using Mermaid diagrams to explain concepts and answer questions"
  2. Export chat as PDF

Logs & Screenshots

OpenWebui:

Image

PDF:

Image

Additional Information

Additionally, the copy, play, and message buttons below the message should not be displayed:

Image
Originally created by @ShirasawaSama on GitHub (Nov 17, 2025). Original GitHub issue: https://github.com/open-webui/open-webui/issues/19227 ### Check Existing Issues - [x] I have searched for any existing and/or related issues. - [x] I have searched for any existing and/or related discussions. - [x] I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!). - [x] I am using the latest version of Open WebUI. ### Installation Method Git Clone ### Open WebUI Version v0.6.36 ### Ollama Version (if applicable) _No response_ ### Operating System MacOS 26 ### Browser (if applicable) Edge 141 ### Confirmation - [x] I have read and followed all instructions in `README.md`. - [x] I am using the latest version of **both** Open WebUI and Ollama. - [x] I have included the browser console logs. - [x] I have included the Docker container logs. - [x] I have **provided every relevant configuration, setting, and environment variable used in my setup.** - [x] I have clearly **listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup** (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc). - [x] I have documented **step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation**. My steps: - Start with the initial platform/version/OS and dependencies used, - Specify exact install/launch/configure commands, - List URLs visited, user input (incl. example values/emails/passwords if needed), - Describe all options and toggles enabled or changed, - Include any files or environmental changes, - Identify the expected and actual result at each stage, - Ensure any reasonably skilled user can follow and hit the same issue. ### Expected Behavior Chat messages containing Mermaid diagrams can be displayed in exported PDFs. ### Actual Behavior Chat messages containing Mermaid diagrams cannot be exported as PDFs ### Steps to Reproduce 1. Ask LLM: "An AI assistant skilled in using Mermaid diagrams to explain concepts and answer questions" 2. Export chat as PDF ### Logs & Screenshots OpenWebui: <img width="1414" height="1224" alt="Image" src="https://github.com/user-attachments/assets/f2e21092-902a-488a-a72f-058812a82812" /> PDF: <img width="1182" height="1496" alt="Image" src="https://github.com/user-attachments/assets/d12d7705-f507-497c-b6d4-d257bd8c93d3" /> ### Additional Information Additionally, the copy, play, and message buttons below the message should not be displayed: <img width="542" height="328" alt="Image" src="https://github.com/user-attachments/assets/7454ab15-71d3-4c6f-8604-4afa1cbe2d33" />
GiteaMirror added the bugconfirmed issue labels 2026-04-25 08:17:08 -05:00
GiteaMirror commented 2026-04-25 08:17:10 -05:00
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@silentoplayz commented on GitHub (Jan 14, 2026):

The issue title is a bit misleading, as it's possible to export a chat as a PDF file, even if it contains a valid MermaidJS diagram that was rendered in the UI of the chat.

Chat

Image

PDF - The issue here is that the MermaidJS diagram isn't rendered in the PDF file.

Image Image

Additionally, the copy, play, and message buttons below the message should not be displayed

This, I can also agree with.

<!-- gh-comment-id:3749046003 --> @silentoplayz commented on GitHub (Jan 14, 2026): The issue title is a bit misleading, as it's possible to export a chat as a PDF file, even if it contains a valid MermaidJS diagram that was rendered in the UI of the chat. ### Chat <img width="2560" height="1277" alt="Image" src="https://github.com/user-attachments/assets/dfad0522-1089-4a40-94ed-3d1501cdf577" /> ### PDF - The issue here is that the MermaidJS diagram isn't rendered in the PDF file. <img width="2559" height="1281" alt="Image" src="https://github.com/user-attachments/assets/a0e5fe12-a929-4ebe-9091-6f9840268962" /> <img width="997" height="1249" alt="Image" src="https://github.com/user-attachments/assets/4174931c-4583-4903-9e0d-0a84436aa5ea" /> > Additionally, the copy, play, and message buttons below the message should not be displayed ### This, I can also agree with.
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Reference: github-starred/open-webui#34342
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