What HTML Viewer does
The editor offers two deliberate workflows. Simple mode is for a single HTML document and immediate feedback: type code and see the preview update without a build step. Files mode is for projects that contain separate HTML, CSS, JavaScript, image and asset files. It preserves folders, resolves local references and can import or export ZIP archives.
The preview includes desktop, tablet and mobile sizes so a layout can be checked without repeatedly resizing the browser window. A full-page option opens the result in more space, while the built-in editor supplies syntax highlighting, code navigation and familiar keyboard shortcuts.
Local-first code processing
User-written project files are processed inside the browser. The service does not require an account and does not upload the contents of the editor to an application database. Local browser APIs handle editing, preview state and export. This makes the tool useful for quick experiments, classroom exercises and code that should not be stored as a hosted project.
The website itself may request externally hosted resources such as fonts, the Monaco editor or optional analytics after consent. Those network requests are separate from the code a user writes. The distinction is documented in the privacy policy and cookie policy.
Who it is for
Learners
Experiment with semantic HTML, CSS layout and small JavaScript interactions while seeing every change immediately.
Developers
Reproduce a front-end issue, inspect a snippet or assemble a small static project without creating a local toolchain.
Designers
Test responsive states, typography and component ideas in a focused environment with a live rendered result.
Editorial and technical principles
- Preview speed first: the single-file path stays lightweight and updates without avoidable work.
- Real project behavior: multi-file mode resolves local assets and folder paths rather than pretending every project is one string.
- Progressive capability: a basic editor remains usable while larger optional libraries load.
- Accessible controls: keyboard shortcuts, labels and responsive controls are treated as product behavior, not decoration.
- Honest privacy language: local code processing is described separately from third-party website resources and consented analytics.
Learn the workflows
Start with the live HTML preview guide, move to the multi-file project guide, or learn how to import and export complete HTML projects.