GitHub HTML Preview Local

Preview the currently displayed GitHub HTML source locally, without a GitHub access token.

GitHub HTML Preview Local adds a Preview button to GitHub HTML file pages. Click it to instantly switch from the source code view to a rendered preview — no GitHub API token required. ■ Perfect for · Quickly checking the appearance of an HTML file stored on GitHub · Previewing small HTML files without setting up GitHub Pages · Reviewing HTML files in private repositories without needing a personal access token · Sharing and reviewing prototype HTML files directly in the browser ■ Key Features · Adds a Preview button to GitHub HTML file pages · Toggle between source code and rendered preview with one click · No GitHub API access token needed · Uses the source code already displayed in your browser — no extra network requests · Automatically resolves relative CSS and image paths to GitHub raw file URLs · Renders inside an extension-owned sandbox frame, avoiding GitHub's Content Security Policy restrictions · Works with both public and private repositories (any repository you can already view in your browser) · Available in English and Japanese ■ How to Use 1. Open an HTML file on GitHub 2. Click the Preview button added to the file toolbar 3. The source view switches to a rendered preview 4. Click Code to return to the source view ■ Privacy · No requests are made to the GitHub API · Your repository content is never sent to any external server · The extension only targets GitHub pages needed to display the current HTML file ■ Limitations · The preview uses source code already visible on the current page; files not shown on that page are not available · Relative asset paths are resolved against GitHub raw URLs and require browser-accessible resources · JavaScript execution is disabled in the preview sandbox for security · Not intended as a replacement for a local development server or full GitHub Pages deployment · GitHub UI changes may occasionally require extension updates