SingleFile

SingleFile is a browser extension that saves a complete web page as a single HTML file by inlining all embedded resources such as images, CSS, and JavaScript. By producing a self-contained document, it enables offline viewing, archiving, and easier sharing of web content. It is available for major web browsers through their extension ecosystems.

When saving, SingleFile gathers the page’s HTML and converts referenced assets into embedded data, typically using inline data URIs or base64 encoding. It can optionally remove extraneous resources, preserve document structure, and adjust links for offline use. The resulting file can be opened in any modern browser without network access.

Usage: The extension is published for Chromium-based browsers (Chrome, Edge, Opera) and Mozilla Firefox. Users install it from the browser’s add-ons or extension store, then click its button to save the current tab as a single HTML file.

Technical and development: SingleFile is open-source software with source code available online. The project is maintained by a community of contributors and aims to provide a portable, standards-compliant saved page that remains faithful to the original layout and content as much as possible.

Limitations: Because pages may rely on dynamic loading or cross-origin resources, some content or interactivity may not be perfectly preserved. Very large pages can produce large HTML files, and certain security policies can restrict inlining of resources on some sites.