Free jsSyntaxTree Alternative
jsSyntaxTree is a widely-used web application for drawing syntax trees from labelled bracket notation. Originally based on phpSyntaxTree, the JavaScript version runs entirely in the browser and generates clean tree diagrams instantly. It's free, open-source, and doesn't require signup. Linguistics students and educators use it for homework, slides, and publications. jsSyntaxTree is excellent if you know bracket notation or are learning it as part of a syntax course. If you prefer a drag-and-drop visual interface instead of typing nested brackets, Fixie's Syntax Tree Builder offers an alternative workflow.
Try Syntax Tree Builder Free →Syntax Tree Builder vs jsSyntaxTree
| Feature | Fixie Syntax Tree Builder | jsSyntaxTree |
|---|---|---|
| Price | Free forever | Free (open source) |
| Signup Required | No | No |
| Input Method | Visual drag-and-drop | Bracket notation text input |
| Learning Curve | Low (visual building) | Medium (bracket syntax required) |
| Customization | Visual controls for style | Font, color, and subscript options |
| Triangle Notation | Not currently supported | Yes (for omitted structure) |
| Export Formats | PNG, SVG | PNG |
Why Choose Fixie?
jsSyntaxTree is a solid, battle-tested tool that has been refined over many years of use in linguistics courses. It handles bracket notation efficiently, supports triangles for omitted structure (useful in generative syntax), and offers customization options for font, color, and subscript notation. If you're taking a syntax class that teaches bracket notation, or if you already have bracketed trees from a textbook or corpus, jsSyntaxTree is a natural choice. The interface is straightforward: paste or type your notation, adjust settings if needed, and download the tree.
The limitation is the same as other bracket notation tools: you need to know the syntax. Brackets must be balanced correctly, labels need to be in the right positions, and visualizing the tree structure from nested text takes practice. For students who are new to syntax, this can be a barrier — it's easy to make typos or misunderstand how the brackets map to the tree structure. Editing a tree means re-editing the text, which can be tedious for complex structures.
Fixie's Syntax Tree Builder offers a visual alternative. Instead of typing brackets, you drag nodes onto a canvas and connect them by clicking. Labels are added by clicking on nodes, and the tree structure is always visible — no mental translation from text to diagram required. This is particularly helpful for beginners or for educators who want to quickly build example trees during lectures without worrying about syntax errors. jsSyntaxTree has the advantage of supporting triangle notation, which Fixie doesn't yet offer. For most basic syntax trees, though, Fixie's visual approach is faster and more intuitive, especially for users who don't use bracket notation regularly.
How to Use Syntax Tree Builder
Step 1: Go to the Syntax Tree Builder
Visit fixie.tools/syntax — no installation, account, or setup required.
Step 2: Drag to Build
Drag nodes from the palette onto the workspace. Click on any node to edit its label (e.g., S, NP, VP, Det, N, V). Connect nodes by dragging from a parent node to a child node.
Step 3: Style Your Tree
Use visual controls to adjust spacing, colors, and fonts. Changes appear instantly — no need to regenerate or reload.
Step 4: Export
Download your syntax tree as a PNG or SVG file, ready to include in assignments, presentations, or papers.