MHT/MHTML Viewer

MHT/MHTML Viewer is a desktop application designed to open, parse, and display MHTML (MIME HTML) files in a browser-like environment. It provides a secure and efficient way to explore saved web pages and email attachments without uploading any data. Key Features File Support •Supports .mhtml, .mht, and .eml file formats •Automatically parses multipart MIME content •Multiple input methods: •Drag and drop files into the viewer •Use the Select File button •Paste directly from the clipboard (⌘/Ctrl + V) Intelligent Content Parsing •Automatically detects multipart boundaries •Parses individual MIME parts •Supports multiple encoding formats: Base64, Quoted-Printable, 7bit/8bit Resource Rewriting & Preview •Automatically rewrites cid: references to local Blob URLs •Maps Content-Location references to resources •Provides a full preview of MHTML content inside an iframe Resource Management •Displays a detailed list of extracted resources •Shows MIME type and file size for each resource •Supports re-rendering the preview •One-click export to standalone HTML Export Function •Exports parsed content as a complete HTML file •Preserves resource references, styles, and structure Technical Features •Local-only processing: No data is uploaded, ensuring privacy •Modern web technologies: Built with native JavaScript, Blob API, and DOMParser •Responsive design: Adapts layout to different screen sizes •Accessibility: Supports keyboard navigation and screen readers Usage Scenarios •View saved web pages in MHTML format •Analyze HTML content from email attachments •Extract resources (images, CSS, JavaScript) for reuse •Browse saved pages offline Interface Design •Modern dark theme with card-style layout •Intuitive drag-and-drop area •Clear metadata display (boundaries, MIME types, sizes) •User-friendly prompts and error handling MHT/MHTML Viewer is ideal for users who need to view and analyze MHTML files. It combines powerful parsing, preview, and export features with a privacy-first design.