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How to open an existing Obsidian vault and add a community theme with Opensidian

Point Opensidian at a vault folder and install a theme into the vault's .obsidian folder.

Who it is forAn Obsidian user on Linux who wants to try Opensidian with their existing notes and keep a familiar look.

The problemThey want to keep their vault and their theme without rebuilding notes or rewriting styles.

The outcomeThe vault opens in Opensidian and the chosen theme appears under Settings, Appearance, Themes.

What you need first

  • A Linux x86_64 machine (the README lists Linux x86_64 only)
  • For the DEB path: a Debian or Ubuntu system with sudo access
  • For the source build: build tools, WebKitGTK 4.1 development packages, and Rust 1.98.0

Steps

  1. Open your vault folder in Opensidian with the Opensidian command, as shown in the README features.
  2. Create the folder .obsidian/themes/ inside the vault, with one subfolder per theme named after the theme's name field.
  3. Copy the theme's manifest.json and theme.css into that subfolder.
  4. Open Settings, then Appearance, then Themes, and choose the theme.
  5. If the theme is broken, check the greyed-out reason shown next to it; the app stays on AnuPpuccin.

Prompt for your agent

Given a vault at <vault-path> and a theme folder at <theme-path> containing manifest.json and theme.css, copy the theme into <vault-path>/.obsidian/themes/<name-from-manifest>/. Report the target folder path and the theme name from the manifest. Verify that the manifest name matches the folder name before reporting success.

Caveat. The README says most Obsidian community themes work as they are, but not every theme is guaranteed to render correctly.

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