Convert PlantUML to Markdown.
Drop a .puml file and get Markdown that keeps the UML diagram source whole and editable. It runs entirely in your browser, so your file never leaves your device.
Drag & drop your files
or
Optimize for AI & RAG
Extra cleanup for LLM ingestion: strip HTML, fix smart quotes, tidy Unicode and spacing.
Add YAML front matter
Prepend a metadata block (title, source, date, word & token counts) for knowledge bases and RAG.
Add table of contents
Build a linked index from the headings. Handy for long documents.
Export RAG chunks (.json)
Split the result into retrieval-ready chunks. Download per file from the result panel.
Most converters quietly upload your documents to a server. This one physically can't.
UML written
as plain text.
PlantUML describes sequence, class and use case diagrams in a compact text syntax. Dropping that source straight into a note can break the indentation and arrows. Converting wraps it in a fenced plantuml block that stays editable.
@startuml
Alice -> Bob: Hello
Bob --> Alice: Hi
@enduml
```plantuml
@startuml
Alice -> Bob: Hello
Bob --> Alice: Hi
@enduml
```
Everything you
actually need.
PlantUML source in, a clean fenced block out, with no server and no account anywhere.
It never leaves your browser
Your .puml file is read on your own device. Nothing is uploaded to any server, ever.
# Heading
- point one
3 chunks
AI & RAG ready
Optional cleanup, YAML front matter, a table of contents and RAG chunk export.
Works offline
Once the page has loaded you can switch off your connection and it keeps converting.
```plantuml
Alice -> Bob
```
Diagram, preserved
The diagram source is kept verbatim in a fenced code block, so the participants and arrows stay readable and nothing is reshaped.
Unicode safe
Accents, symbols and non-Latin scripts come through intact as UTF-8.
Free, and unlimited
No sign-up, no quotas, no watermarks. Convert one file or a thousand; it all runs the same way, on your own device.
Nothing is
lost.
Honest about what comes through, and what stays put. These are the same notes the Formats list shows for PlantUML, so the page never drifts from what the converter really does.
Kept
2- The full diagram source
- A fenced block tagged plantuml
Preserved
2- @startuml and @enduml markers
- Participants, arrows and notes
@startuml
@enduml
Alice -> Bob: Hello
Bob --> Alice: Hi
PlantUML questions,
answered.
Everything worth knowing before you drop in a .puml diagram.
Other converters.
Working with more than diagrams? These convert the same way: privately, in your browser.
ZIP to Markdown
.zip · .jar · .war
ZIP archives, contents converted.
tar / gzip to Markdown
.tar · .gz · .tgz
tar & gzip archives, contents converted.
torrent to Markdown
.torrent
BitTorrent metadata files.
JavaScript / TypeScript to Markdown
.js · .ts · .jsx · .tsx
JS, TS, JSX & TSX source.
Python to Markdown
.py
Python source code.
Java to Markdown
.java
Java source code.
C / C++ to Markdown
.c · .cpp · .h
C and C++ source code.
C# to Markdown
.cs
C# source code.