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Renders PlantUML code blocks in place, entirely in your browser. PlantUML In-Place Preview is a Google Chrome extension that replaces PlantUML code blocks with diagrams in place. It is a maintained fork of Pegmatite. The store display name was Pegmatite-gitbucket through 2.0.0; from 2.0.1 the product name is PlantUML In-Place Preview. The extension ID is unchanged, so existing installs keep working after update. This fork adds support for GitBucket, along with stronger support for self-hosted GitLab instances. Rendering runs entirely inside the browser. No PlantUML server is contacted, so diagram source never leaves your machine. The extension activates on major Git hosting and wiki sites, including self-hosted instances, and detects PlantUML code fences automatically. Hover icons let you toggle between the source and the rendered diagram, and download the diagram as an SVG file. source code: https://github.com/Hondarer/pegmatite licence: Apache-2.0 license https://github.com/Hondarer/pegmatite#Apache-2.0-1-ov-file PlantUML In-Place Preview itself is licensed under the Apache License 2.0. The packaged extension additionally bundles two MIT-licensed components. One is @plantuml/core, which is PlantUML by Arnaud Roques compiled to JavaScript. The other is Viz.js by Michael Daines. Its distribution contains Graphviz (Eclipse Public License 1.0) and Expat (MIT) in object code form.
Aug 11, 2026
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