SingleFileZ’s self-extracting webpage format is now part of SingleFile. To save a page in that format, install or open SingleFile, then choose the self-extracting option in the extension’s options page under File format. The project’s official repository confirms the merger and points users to that setting, but does not provide a current step-by-step walkthrough of the options page.
What happened to SingleFileZ?
The official SingleFileZ repository says, “SingleFileZ has been completely merged into SingleFile.” You do not need to look for a separate current SingleFileZ extension: use SingleFile and select its self-extracting file format. The repository also says existing settings can be imported.
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Save a webpage in the self-extracting format
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Install or open the SingleFile browser extension.
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Open SingleFile’s options page and find the File format section.
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Choose the self-extracting format, then save the options.
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Visit the webpage you want to preserve and use SingleFile to save it.
Exact button names and menu paths may vary by browser or extension version; the official project guidance identifies the setting but does not publish a current click-by-click sequence. The result is a self-extracting webpage file, rather than a conventional HTML file that depends only on resources bundled in the document.
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What to expect when opening the saved file
JavaScript and local-file restrictions
The SingleFileZ FAQ says JavaScript must be enabled to open pages saved in the self-extracting format. It also notes browser-specific restrictions when opening files from the local filesystem. In Chrome, the FAQ says opening the file requires a command-line switch or the extension. Firefox and Safari have their own local-file conditions described there. The FAQ says these restrictions do not apply when the saved page is hosted on a server.
Speed and completeness involve trade-offs
The FAQ cautions that the self-extracting format can take longer to save and open. It also says the extension may retrieve resources present on the original page even if they were not displayed or cached. This does not guarantee that every interactive feature, login-protected resource, or embedded media item will work in the saved copy.
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Troubleshoot common problems
The extension will not save the page
Some domains are blocked by browser security policy, according to the FAQ. Try another page or browser context where the extension is permitted; a domain restriction does not by itself mean the output format is broken.
Saving is slow or uses substantial CPU
The FAQ says the default configuration favors smaller output. Removing hidden elements and unused styles can take extra processing. If speed matters more than minimizing file size, review those optimization options in SingleFile’s settings and consider disabling them.
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Images, frames, or other resources are missing
The FAQ warns that disabling frame removal or deferred-image saving can leave resources out of the saved page. Review those settings if completeness matters. Dynamic content can also depend on how the original page loads; the project does not promise that every page will be captured perfectly.
Chrome will not open the saved file
Per the FAQ, Chrome’s local-file restrictions require a command-line switch or the extension to open this format from the filesystem. Hosting the file on a server avoids the specific local-file restriction described by the FAQ.
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The SingleFileZ FAQ says the extension does not upload saved data to third-party servers. It also says it may retrieve resources found on the page even when they are not displayed or cached. This is the project’s stated behavior, not an independent security audit or a guarantee about requests made by the original webpage.
Or skip the browser setup
If you need an image or PDF capture rather than a portable, self-extracting HTML file, ScreenshotNeo offers a one-request screenshot API. Its API returns PNG, JPEG, WebP, or PDF output; it is not an HTML archive replacement.
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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo documentation for request options. ScreenshotNeo accepts cookie banners and removes known consent banners, newsletter popups, and chat widgets before capture; bot checks, blank pages, failed loads, timeouts, and cache hits are not billed. Its MCP server lets AI agents use screenshot tools. The Free plan includes 1,000 shots per month without a card; paid plans start at $5 for 3,000 shots.
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