Renders PlantUML code blocks in place, entirely in your browser.
Users
53
+5 in 30 days
Rating
0.0 / 5
unchanged in 30 days
Ratings
0
0 in 30 days
Store rank
#106K
#89K among extensions
Version
2.0.5
updated 6 Sep 2026
Users
monthly, 3 years
Latest, 16 Oct 2026:53 usersMove the mouse over the chart for any month
Ratings count
monthly, 3 years
Latest, 16 Oct 2026:0 ratingsMove the mouse over the chart for any month
The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.
About PlantUML In-Place Preview
PlantUML In-Place Preview renders PlantUML code blocks as diagrams on the page. Rendering runs entirely in the browser. No PlantUML server is contacted, so diagram source never leaves your machine. The extension stores no user data.
It is a maintained fork of Pegmatite. The store name was Pegmatite-gitbucket through 2.0.0. From 2.0.1 the name is PlantUML In-Place Preview. The extension ID is unchanged, so existing installs keep working after update.
It renders a code block when the language is uml, puml, or plantuml, and the source starts with @start. On some sites, a missing @startuml is completed for you.
Hover the diagram to show two icons. One toggles between the source and the rendered diagram. The other downloads the diagram as an SVG file, always in the light theme.
Source:
https://github.com/Hondarer/pegmatite
License:
Apache License 2.0
https://github.com/Hondarer/pegmatite/blob/develop/LICENSE
The packaged extension also bundles @plantuml/core (MIT; PlantUML by Arnaud Roques, compiled to JavaScript) and Viz.js 3.24.0 (MIT; Michael Daines). Viz.js includes Graphviz 14.1.1 (Eclipse Public License 1.0) and Expat 2.7.3 (MIT) in object code form.
Full license texts ship in the extension package as LICENSE, LICENSE.plantuml-core, LICENSE.viz-js, LICENSE.graphviz, and LICENSE.expat. Attribution is in NOTICE:
https://github.com/Hondarer/pegmatite/blob/develop/NOTICE