I generally prefer to use a Chrome extension to accomplish this, but Monolith is a CLI tool that will save a web page as a single HTML file. And it does so with a bit of humor,
A data hoarder’s dream come true: bundle any web page into a single HTML file. You can finally replace that gazillion of open tabs with a gazillion of .html files stored somewhere on your precious little drive.
If compared to saving websites with wget -mpk, this tool embeds all assets as data URLs and therefore lets browsers render the saved page exactly the way it was on the Internet, even when no network connection is available.
SingleFile is an extension for Chrome, Firefox and Edge that will download a web page as a single HTML file. Images, etc. will be converted to Base64 and included in the single page archive.
ArchiveBox is a free, open-source tool that lets users create archived versions of web pages,
ArchiveBox takes a list of website URLs you want to archive, and creates a local, static, browsable HTML clone of the content from those websites (it saves HTML, JS, media files, PDFs, images and more).
You can use it to preserve access to websites you care about by storing them locally offline. ArchiveBox imports lists of URLs, renders the pages in a headless, autheticated, user-scriptable browser, and then archives the content in multiple redundant common formats (HTML, PDF, PNG, WARC) that will last long after the originals disappear off the internet. It automatically extracts assets and media from pages and saves them in easily-accessible folders, with out-of-the-box support for extracting git repositories, audio, video, subtitles, images, PDFs, and more.