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You can give generated Javadoc the look of your website without replacing its generator: add a focused CSS file with --add-stylesheet, then adjust the standard stylesheet’s font and color variables. Keep the default stylesheet in place unless you intend to take responsibility for the documentation’s entire visual design.
Choose the right way to customize Javadoc
The Javadoc tool processes Java declarations and documentation comments through a doclet. Its default, the Standard Doclet, generates HTML API documentation. For most site-branding work, leave that structure and its default styling intact and layer on a small stylesheet. Oracle’s JavaDoc Guide and OpenJDK’s Programmer’s Guide to JavaDoc CSS Themes describe the stylesheet options and theming approach.
| Option | What it changes | Best fit | Trade-off |
|---|---|---|---|
--add-stylesheet |
Adds CSS alongside the default stylesheet. | Brand colors, typography, spacing, and selected refinements. | Preserves default styling; check overrides against the generated pages for your JDK. |
--main-stylesheet |
Replaces the default stylesheet. | A deliberate, complete redesign. | Your replacement stylesheet is responsible for the documentation’s styling. Oracle advises starting from the default stylesheet. |
| Overview options | Adds overview content and sets its title. | Introducing the API in your site’s voice. | Changes content, not the styling of the generated pages. |
| Custom doclet or taglet | Changes generation behavior or custom-tag output. | Nonstandard output or content requirements. | Requires Java implementation and familiarity with the Doclet or Taglet API. |
Add a site theme while keeping the defaults
Use --add-stylesheet to apply selected CSS rules without discarding the Standard Doclet’s stylesheet. This is the incremental route: it lets you tune the palette and type system while retaining the generated structure and the rules you have not chosen to change.
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Create a CSS file, for example
site-theme.css, and add it to the Javadoc command:javadoc --add-stylesheet site-theme.css -d build/javadoc @sources.txt -
Start with the shared custom properties used by the default stylesheet. For example:
:root { --body-font-family: system-ui, sans-serif; --body-font-size: 15px; } -
Build the documentation, then inspect the generated pages. Confirm the property names and markup against the stylesheet shipped with the JDK you use to generate the site. The OpenJDK guide demonstrates redefining
--body-font-size; do not assume every JDK release exposes identical details.Rank #2
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Add direct CSS overrides only where the custom properties do not provide enough control. Check that API signatures, links, code blocks, and focus states remain easy to distinguish in the rendered pages.
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The default stylesheet uses CSS custom properties for fonts and colors, making them a convenient starting point for a consistent theme. CSS can change presentation; it does not change what the doclet generates.
Replace the stylesheet only for a full redesign
--main-stylesheet replaces the default stylesheet with the file you provide. Oracle’s Java SE 24 JavaDoc Guide describes this as a replacement, not an additive override. If you choose it, treat your CSS as the complete styling layer: use the default stylesheet as a reference, generate documentation, and inspect the actual output rather than expecting a handful of brand rules to cover every page element.
Use overview options to add context and voice
CSS is not the only way to make API documentation feel part of your site. Javadoc’s -overview option reads an overview file in HTML or Markdown, and -doctitle sets the overview page title. For an HTML overview file, Javadoc uses the content inside <main> when present; otherwise, it uses the content inside <body>. Use this content to explain the API and orient readers, while the stylesheet handles visual presentation.
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Use a doclet or taglet when CSS is not enough
If the requirement is to change generated content or structure—not just its appearance—look beyond CSS. A custom doclet can change generation behavior; a taglet customizes output for user-defined tags. Taglet output must suit its context: inline output must be flow content, while block output must be appropriate for a definition list. Oracle’s Java SE 24 StandardDoclet API reference documents the relevant API constraints.
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Match commands to the JDK that builds your documentation
Javadoc options belong to the JDK toolchain used to generate the site, so verify option names and stylesheet behavior in the command reference for that JDK. Oracle’s Java SE 21 reference lists --main-stylesheet as the preferred spelling and -stylesheetfile as an alternate. The Java SE 27 reference lists --add-stylesheet. Use the documentation matching your installed JDK rather than assuming examples from another release apply unchanged.
Best Value
Branding should not come at the cost of readability or navigation. The cited guides explain how to attach CSS; they do not certify a particular custom theme’s accessibility. Assess contrast, keyboard focus, and the visibility of code and links in your own rendered output.
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